Stainless steel composite powder for additive manufacturing, additive component and preparation method

Abstract

The invention relates to stainless steel composite powder for additive manufacturing, an additive component and a preparation method, and belongs to the technical field of additive manufacturing. The stainless steel composite powder for additive manufacturing comprises the following elements in percentage by mass: 15-18% of Cr, 9.5-14.5% of Ni, 1.5-3% of Mo, 0.1-3.0% of Zr, 0.02-1% of Cu, 0.01-0.7% of Ti, 0.001-0.2% of Be, less than or equal to 2% of Mn, less than or equal to 1% of Si, less than or equal to 0.1% of N, less than or equal to 0.045% of P, less than or equal to 0.03% of C, less than or equal to 0.03% of S and the balance of Fe. According to the method, the Vitreoy1 amorphous alloy is introduced to modify the 316L stainless steel, the Vitreoy1 amorphous alloy has the excellent amorphous forming ability and strengthening characteristic, the Vitreoy1 amorphous alloy and a 316L stainless steel base body can generate the multi-dimensional synergistic effect in the additive manufacturing process, and then comprehensive improvement of the comprehensive performance of the material is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of additive manufacturing technology, and particularly relates to a stainless steel composite powder for additive manufacturing, an additive component and a preparation method. BACKGROUND

[0002] As a "bottom-up" part forming technology, additive manufacturing technology relies on the core forming concept of discrete accumulation. Compared with traditional mechanical processing methods, it can greatly reduce the mechanical processing links, reduce the amount of material waste, significantly improve the processing efficiency and forming freedom of complex structural parts, and effectively reduce the investment risk of product research and production. It has become a key and core technology for manufacturing high-performance structural parts in the fields of aerospace, medical treatment, high-end equipment, etc.

[0003] 316L stainless steel, as a low-carbon austenitic stainless steel, has been widely used in many key fields due to its excellent resistance to chloride ion corrosion, good weldability, stable room temperature and low temperature mechanical properties, and excellent biocompatibility. In the field of marine engineering, its ability to resist pitting and crevice corrosion in seawater and salt spray makes it a core material for ship ballast water system pipes and offshore platform load-bearing structural parts; in the food and pharmaceutical industry, it is often used in food mixing tanks, pharmaceutical purification equipment liners and conveying pipes due to its non-harmful element precipitation and easy cleaning characteristics; in the medical field, it can be processed into artificial bone nails, dental implants and other implant devices, which are suitable for human physiological environment and can serve stably for a long time; in the chemical industry, in the face of strong acid, strong alkali and other corrosive media, 316L stainless steel reaction kettles and heat exchangers can ensure the safety and continuity of the production process. Among them, the austenitic structure of 316L stainless steel gives it good plasticity and toughness, making it highly adaptable to cold working, hot forming and additive manufacturing processes. In particular, in the field of additive manufacturing, 316L stainless steel has good powder flowability and high forming precision, and has become a commonly used material for aerospace lightweight components and customized industrial parts, long-term occupying an important share of the additive manufacturing stainless steel application market. However, with the upgrading of technologies in high-end equipment manufacturing, new energy, deep space exploration and other fields, higher requirements are put forward for the comprehensive performance of structural parts. The traditional pure 316L stainless steel gradually exposes application bottlenecks: first, the mechanical properties have short boards. After traditional forging or additive manufacturing, the room temperature tensile strength of pure 316L stainless steel is usually 500-650 MPa, the room temperature yield strength is about 200-250 MPa, and the elongation after fracture can reach more than 30%, but in the scene requiring high load and fatigue resistance, the strength index is difficult to meet the design requirements, and it needs to rely on material compounding or strengthening treatment; second, the adaptability to extreme environment is insufficient. In low temperature (below-196℃) or high temperature (above 500℃) working conditions, the grain boundary strength of 316L stainless steel will decrease significantly, which is easy to cause low-temperature brittle fracture or high-temperature creep failure, limiting its application in liquefied natural gas storage tanks, high-temperature accessories of aircraft engines and other scenes; third, the performance improvement process has limitations. The traditional way of improving the performance of 316L stainless steel through solid solution strengthening and cold working strengthening either causes a significant decrease in material plasticity or needs complex subsequent processing procedures, which not only increases the production cycle and cost, but also may cause size precision deviation of the components due to processing stress, making it difficult to meet the manufacturing requirements of high-precision integrated components.

[0004] The invention patent with the application publication number CN109504910A discloses a copper-zirconium reinforced corrosion-resistant austenitic stainless steel and a preparation method thereof. The mass percentage of each element of the copper-zirconium reinforced corrosion-resistant austenitic stainless steel is as follows: C≤0.03, Ni=12.0~15.0, Cr=16.0~18.0, Mo=2.0~3.0, Zr≤0.53, Cu=0.2~0.8, Mn≤2.0, Si≤1.0, P≤0.035, S≤0.030, wherein 7.59×C≤Zr≤7.59×C+0.3, and the balance is Fe. Compared with 316L stainless steel, the mechanical properties of the copper-zirconium reinforced corrosion-resistant austenitic stainless steel are enhanced, but in the scene requiring high load and fatigue resistance, the strength index is difficult to meet the design requirements. SUMMARY

[0005] The first object of the present application is to provide a stainless steel composite powder for additive manufacturing to solve the technical problem of low additive strength of traditional pure 316L stainless steel and difficulty in meeting the high load demand.

[0006] The second object of the present application is to provide a preparation method of a stainless steel composite powder for additive manufacturing.

[0007] The third object of the present application is to provide an additive component.

[0008] The fourth object of the present application is to provide a preparation method of an additive component.

[0009] In order to achieve the above object, the technical scheme adopted by the present application is: A stainless steel composite powder for additive manufacturing, the mass percentage of each element of the stainless steel composite powder for additive manufacturing is: Cr: 15-18 %, Ni: 9.5-14.5 %, Mo: 1.5-3 %, Zr: 0.1-3.55 %, Cu: 0.02-1 %, Ti: 0.01-0.7 %, Be: 0.001-0.2 %, Mn≤2 %, Si≤1 %, N≤0.1 %, P≤0.045 %, C≤0.03 %, S≤0.03 %, and the balance is Fe.

[0010] A preparation method of a stainless steel composite powder for additive manufacturing, the stainless steel composite powder is obtained after ball milling of a stainless steel powder and an amorphous alloy powder; the mass percentage of each element of the stainless steel powder is: Cr: 16-18 %, Ni: 10-14 %, Mo: 2-3 %, Mn≤2 %, Si≤1 %, N≤0.1 %, P≤0.045 %, C≤0.03 %, S≤0.03 %, and the balance is Fe; the mass percentage of each element of the amorphous alloy powder is: Ti: 9.8-13.1 %, Cu: 12.3-18.5 %, Ni: 2.1-9.8 %, Be: 0.8-3.2 %, and the balance is Zr.

[0011] Further, the particle size of the stainless steel powder is 15-53 μm, and the particle size of the amorphous alloy powder is 15-25 μm.

[0012] Further, the ball-to-material ratio in the ball milling process is 13-15:1, the ball milling speed is 120-130 r / min, and the ball milling time is 4-6 h; and the stainless steel composite powder for additive manufacturing is obtained after vacuum drying after the ball milling.

[0013] Further, the amorphous alloy powder accounts for 0.2-5 % of the total mass of the stainless steel composite powder for additive manufacturing.

[0014] An additive component is prepared by using the above-mentioned stainless steel composite powder for additive manufacturing.

[0015] A preparation method of an additive component, the stainless steel composite powder for additive manufacturing is prepared under a flowing inert atmosphere by using a selective laser melting additive manufacturing method.

[0016] Further, the inert atmosphere is argon.

[0017] Further, the laser rotates at an angle of 60-70° between each layer in the selective laser melting additive manufacturing method.

[0018] Further, the selective laser melting additive manufacturing method has a laser scanning speed of 800-1200 mm / s, a laser power of 180-260 W, a scanning interval of 60-80 µm, and a powder layer thickness of 20-40 µm.

[0019] The Vitreloy1 amorphous alloy has a unique composition system and performance advantage, and contains Zr, Ti, Cu, Ni and Be elements, which can form a stable solid solution or a second phase of dispersed distribution with Fe, Cr and Mo elements in the 316L stainless steel matrix, and can also refine the microstructure of the 316L stainless steel through amorphization reaction, and the synergistic interaction between the elements can further optimize the matching relationship of strength, plasticity and corrosion resistance of the material.

[0020] The Vitreloy1 amorphous alloy has a unique composition system and performance advantage, and contains Zr, Ti, Cu, Ni and Be elements, which can form a stable solid solution or a second phase of dispersed distribution with Fe, Cr and Mo elements in the 316L stainless steel matrix, and can also refine the microstructure of the 316L stainless steel through amorphization reaction, and the synergistic interaction between the elements can further optimize the matching relationship of strength, plasticity and corrosion resistance of the material.

[0021] The introduction of the Vitreloy1 amorphous alloy does not damage the stability of the original austenite structure of the 316L stainless steel, and also realizes significant improvement of mechanical properties and process performance through multiple effects: on the one hand, the Zr and Ni elements in the Vitreloy1 amorphous alloy can be dissolved into the 316L matrix to form a multi-element austenite solid solution, greatly enhancing the solid solution strengthening effect and improving the basic strength of the matrix; on the other hand, the Cu and Ti elements are easy to form dispersed intermetallic compounds such as Cu-Fe compounds and Ti-Cr compounds with the matrix and other elements, which can effectively hinder dislocation movement and refine the coarse columnar crystal structure of the 316L stainless steel that is prone to occur during additive manufacturing, avoiding performance fluctuations caused by coarse grains; in addition, the relatively narrow solidification temperature interval characteristics of the Vitreloy1 amorphous alloy can also improve the melting fluidity and solidification formability of the 316L stainless steel powder during additive manufacturing, reduce forming defects, and further improve the microstructure uniformity and dimensional accuracy of the components.

[0022] Chromium is a key corrosion-resistant element and austenite-stabilizing element in 316L stainless steel. As a key component of the passivation film, each 1% increase in Cr can significantly improve the pitting resistance of 316L stainless steel in a chloride ion environment, while also enhancing the solid solution strengthening effect. In addition, Cr can also improve the high-temperature oxidation resistance of 316L stainless steel, extending the service life of the material under high-temperature working conditions. In the present invention, the chromium content is controlled in the range of 15-18%. This range not only ensures that 316L stainless steel has excellent basic corrosion resistance and structural stability, but also provides space for the synergistic effect of other strengthening elements introduced by Vitreloy1 amorphous alloy, avoiding the increase in alloy brittleness caused by excessive Cr content. Molybdenum is a key corrosion-resistant and strengthening element in 316L stainless steel, which can significantly improve the resistance of the material to crevice corrosion and pitting corrosion in a chloride ion environment, and can also enhance the strength and hardness of the austenitic matrix through solid solution strengthening. In the present invention, the molybdenum content is controlled in the range of 1.5-3%. This range can fully utilize the corrosion-resistant and strengthening effects of molybdenum, and also synergizes with the Zr element in Vitreloy1 amorphous alloy to further enhance the service stability of the material in harsh corrosive environments. Zirconium is completely derived from Vitreloy1 amorphous alloy. As a transition metal element similar to Ti, it has good solid solution compatibility in 316L stainless steel. It not only enhances the room temperature and high temperature strength of the material through solid solution strengthening, but also optimizes the austenite grain structure and inhibits grain growth. More importantly, Zr can synergize with Be and Cu elements in Vitreloy1 amorphous alloy to promote the uniform distribution of amorphous phase and alleviate the composition segregation problem that often occurs in 316L stainless steel during additive manufacturing. It is one of the core elements for improving the comprehensive performance of the material. In the present invention, the zirconium content is controlled in the range of 0.1-3.55%. This content range can maximize the solid solution strengthening, grain refinement, and amorphous synergistic effects, while avoiding excessive reduction of alloy melting point and deterioration of casting performance caused by excessive Zr content. Copper is derived from Vitreloy1 amorphous alloy and is an important strengthening and process optimization element. On the one hand, Cu can enhance the solid solution strengthening effect and improve the strength of the material after being dissolved into the 316L matrix. On the other hand, the addition of Cu can improve the hot working performance of 316L stainless steel, and fine strengthening phases can be precipitated during aging, further improving the hardness and wear resistance of the material. In the present invention, the copper content is controlled in the range of 0.02-1%. This content can form appropriate strengthening phases, while avoiding the increase in hot cracking sensitivity and excessive decrease in plasticity caused by excessive Cu content. Beryllium is from Vitreloy1 amorphous alloy, which is the key element to realize the synergistic strengthening of amorphous and the optimization of forming performance. Be can form low-melting-point amorphous phase with Zr, Ti and other elements, which can act as heterogeneous nucleation core to refine the grain structure during the solidification process of additive manufacturing; at the same time, the addition of Be can reduce the melting viscosity of the alloy, improve the fluidity of the molten pool, reduce forming defects such as pores and incomplete fusion, and indirectly ensure the uniformity of material performance. In the present application, the composition range of beryllium is controlled to be 0.001-0.2%, which can fully play the role of amorphous refinement and forming property improvement, and can strictly control the potential brittle effect of Be to ensure the safe service of the material. Nickel is from Vitreloy1 amorphous alloy and 316L stainless steel, which is an austenite stabilizing element and a strengthening element, can enhance the stability of the austenite structure of 316L stainless steel and improve the low-temperature toughness of the material; at the same time, Ni can form multi-element strengthening phase with Cu and Cr elements, further improving the strength and corrosion resistance of the material, and having less negative impact on the plasticity of the material. In the present application, the composition range of nickel is controlled to be 9.5-14.5%, which can form an efficient synergistic strengthening effect with other elements, while considering the cost control and performance balance of the material. Iron is the base element of 316L stainless steel, which is the basic framework of austenite structure, not only determines the basic mechanical properties of the material, but also cooperates with Cr, Mo and other elements to ensure corrosion resistance; a small amount of Fe can also assist to improve the strength of the material through solid solution strengthening. The composition range of iron in the present application can ensure the stability of the base structure, and provide sufficient space for other functional elements, avoiding performance deviation caused by fluctuation of Fe content, and ensuring the uniformity of the overall performance of the component. The present application introduces Vitreloy1 amorphous alloy precisely, so that the multi-element in 316L stainless steel matrix and Vitreloy1 amorphous alloy forms a multiple action mechanism of solid solution strengthening, dispersion strengthening, grain refinement and amorphous synergy. This synergistic effect strictly controls the addition amount and final composition ratio of Vitreloy1 amorphous alloy, so that Zr, Cu, Ni, Be and other elements are deeply coupled with Cr, Mo and Fe elements in the 316L matrix, which not only ensures that the material is suitable for additive manufacturing process and has good forming performance, but also realizes a breakthrough in mechanical properties and corrosion resistance, and expands the application boundary of 316L stainless steel in high-end equipment field.

[0023] The beneficial effects of the present application are: I. Mechanical properties are greatly improved. The room temperature tensile strength of traditional pure 316L stainless steel additive body is usually 500-650 MPa, and the room temperature yield strength is usually 200-250 MPa. The room temperature tensile strength of the additive member of the present application can reach 915-1219 MPa, which is 66-88% higher than that of the traditional pure 316L stainless steel additive body; the room temperature yield strength can reach 609-1002 MPa, which is about 144-301% higher than that of the traditional pure 316L stainless steel additive body; the additive member of the present application also maintains 10-19% elongation after fracture, which balances the good plasticity while achieving a leap in strength, breaking the performance bottleneck of traditional pure 316L stainless steel "low strength, difficult to meet the demand of high bearing", which can be adapted to aerospace bearing support, new energy high pressure hydrogen storage tank, marine engineering heavy load structure and other scenes with strict requirements on high strength and plasticity balance.

[0024] II. Excellent formability and performance uniformity. On the one hand, the narrow solidification interval characteristics of Vitreloy1 amorphous alloy improve the melting fluidity of 316L stainless steel powder in the LPBF additive manufacturing process, and cooperate with the precise regulation of the molten pool temperature in the process, effectively reducing defects such as pores, incomplete fusion, and thermal cracks, and the density of the member can reach more than 99.5%, the forming quality is significantly better than that of traditional pure 316L stainless steel additive parts; on the other hand, Zr, Be and other elements in Vitreloy1 amorphous alloy can form heterogeneous nucleation cores through amorphization reaction, refining the austenite grains of 316L matrix, avoiding the coarse columnar crystal and texture phenomenon prone to occur in traditional pure 316L stainless steel additive body, so that the hardness deviation of different regions of the member is controlled within 5 HV, the mechanical property uniformity is greatly improved, and the risk of fracture failure caused by local performance weakness under complex load is reduced.

[0025] III. No need for subsequent heat treatment, simplifying the production process. The present application realizes the improvement of mechanical properties through the composition synergistic design of Vitreloy1 amorphous alloy and 316L matrix, and the multiple effects of solid solution strengthening, dispersion strengthening and grain refinement, without relying on subsequent processes such as solid solution treatment and cold working strengthening commonly used for traditional 316L stainless steel. This advantage not only avoids the dimensional deformation of the member caused by thermal stress in the heat treatment process, ensuring the forming quality of high-precision integrated member, but also reduces the production process of "additive manufacturing-heat treatment-precision repair", shortens the production cycle by about 30%, reduces the investment in heat treatment equipment and energy consumption, significantly reduces the production cost and process complexity, and is more suitable for industrial batch production needs. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Tensile curve of the additive member of Example 5; Figure 2Optical electron microscope topography of the additive component of Example 5, wherein the magnification of A is 50 times, the magnification of B is 100 times, the magnification of C is 200 times, and the magnification of D is 500 times; Figure 3 Scanning electron microscope topography of the additive component of Example 5; Figure 4 Energy dispersive spectrometer diagram of the additive component of Example 5; Figure 5 Tensile fracture topography of the additive component of Example 5; Figure 6 Scanning electron microscope topography of the additive component of Comparative Example 1. DETAILED DESCRIPTION

[0027] The application will be further described below in conjunction with the embodiments of the application and the accompanying drawings.

[0028] The 316L stainless steel used in the examples and comparative examples has the following mass percentages of each element: Cr: 17%, Ni: 12%, Mo: 2.5%, Mn: 2%, Si: 1%, N: 0.1%, P: 0.045%, C: 0.03%, S: 0.03%, and the balance being Fe. The Vitreloy1 amorphous alloy used has the following atomic ratios of each element: 41.2Zr-13.8Ti-12.5Cu-10Ni-22.5Be. The Vitreloy1 amorphous alloy has the following mass percentages of each element: Ti: 11.03%, Cu: 13.26%, Ni: 9.8%, Be: 3.39%, and the balance being Zr. Example 1

[0029] The method for preparing the stainless steel composite powder for additive manufacturing of Example 1 comprises the following steps: preparing the 316L stainless steel into a stainless steel powder having a particle size of 15-53 μm by using a gas atomization powdering method; preparing the Vitreloy1 amorphous alloy into an amorphous alloy powder having a particle size of 20 μm by using a gas atomization powdering method; and ball-milling the stainless steel powder and the Vitreloy1 amorphous alloy powder uniformly using a ball mill, and then vacuum drying for 3 h to obtain the stainless steel composite powder for additive manufacturing. The Vitreloy1 amorphous alloy powder accounts for 0.2% of the total mass of the stainless steel composite powder for additive manufacturing. The mass ratio of the ball to the powder during the ball-milling is 15:1, the ball-milling speed is 130 r / min, and the ball-milling time is 6 h. The ball-milling is performed in an atmospheric environment.

[0030] The mass percentage of each element in the stainless steel composite powder for additive manufacturing is: Cr: 16.97%, Ni: 11.99%, Mo: 2.495%, Zr: 0.142%, Cu: 0.0308%, Ti: 0.023%, Be: 0.004%, Mn: 1.996%, Si: 0.998%, N: 0.0998%, P: 0.0449%, C: 0.0299%, S: 0.0299%, and the balance is Fe.

[0031] The preparation method of the additive component of Example 1 comprises the following steps: the stainless steel powder for additive manufacturing is prepared into a 10×10×10 cm stainless steel block under the atmosphere of flowing argon by a selective laser melting (SLM) additive manufacturing method, and the stainless steel block is the additive component. The laser scanning speed of the SLM additive manufacturing method is 800 mm / s, the laser power is 180 W, the scanning interval is 70 μm, the powder layer thickness is 30 μm, the additive component is pre-evacuated and then filled with argon, and the interlayer rotation angle of the selective laser melting additive manufacturing method is 66.7°.

[0032] It is found by metallographic specimen that the microstructure of the additive component is basketweave structure. The additive component is cut into two types of specimens parallel to the substrate and perpendicular to the substrate direction, the additive component is made into tensile specimens in accordance with the national standard, and the tensile experiment is carried out, so that the tensile strength parallel to the substrate direction is 915 MPa, the yield strength is 609 MPa, and the elongation after fracture is 12.1%; the tensile strength perpendicular to the substrate direction is 925 MPa, the yield strength is 622 MPa, and the elongation after fracture is 12.4%. Example 2

[0033] The preparation method of the stainless steel composite powder for additive manufacturing of Example 2 comprises the following steps: the 316L stainless steel is prepared into a stainless steel powder with a particle size of 15-53 μm by a gas atomization powdering method; the Vitreloy1 amorphous alloy is prepared into an amorphous alloy powder with a particle size of 20 μm by a gas atomization powdering method; the stainless steel powder and the amorphous alloy powder are mixed and then mixed by a ball mill, and vacuum drying is carried out for 3 h. The amorphous alloy powder accounts for 0.5% of the total mass of the stainless steel for additive manufacturing. The mass ratio of balls to materials during ball milling is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0034] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.92%, Ni: 11.97%, Mo: 2.488%, Zr: 0.355%, Cu: 0.077%, Ti: 0.0575%, Be: 0.01%, Mn: 1.99%, Si: 0.995%, N: 0.0995%, P: 0.0448%, C: 0.0299%, S: 0.0299%, with the balance being Fe.

[0035] The method for preparing the additive component in Example 2 includes the following steps: Stainless steel powder for additive manufacturing is used in the SLM additive manufacturing method to prepare a 10×10×10 cm stainless steel block under a flowing argon atmosphere. The stainless steel block is the additive component. The laser scanning speed of the SLM additive manufacturing method is 800 mm / s, the laser power is 180 W, the scanning spacing is 70 μm, the powder layer thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the selective laser melting additive manufacturing method is 66.7°.

[0036] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 991 MPa, the yield strength was 684 MPa, and the elongation after fracture was 10.9%. The tensile strength perpendicular to the substrate was 990 MPa, the yield strength was 691 MPa, and the elongation after fracture was 11%. Example 3

[0037] The preparation method of stainless steel composite powder for additive manufacturing in Example 3 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 1% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-powder mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0038] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.83%, Ni: 11.94%, Mo: 2.475%, Zr: 0.71%, Cu: 0.154%, Ti: 0.115%, Be: 0.02%, Mn: 1.98%, Si: 0.99%, N: 0.099%, P: 0.0446%, C: 0.0297%, S: 0.0297%, with the balance being Fe.

[0039] The preparation method of the additive component in Example 3 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 800 mm / s, the laser power is 180 W, the scanning spacing is 70 μm, the powder layer thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0040] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 1054 MPa, the yield strength was 725 MPa, and the elongation after fracture was 11%. The tensile strength perpendicular to the substrate was 1091 MPa, the yield strength was 751 MPa, and the elongation after fracture was 10.9%. Example 4

[0041] The preparation method of stainless steel composite powder for additive manufacturing in Example 4 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 2% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-material mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0042] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.66%, Ni: 11.88%, Mo: 2.45%, Zr: 1.42%, Cu: 0.308%, Ti: 0.23%, Be: 0.04%, Mn: 1.96%, Si: 0.98%, N: 0.098%, P: 0.0441%, C: 0.0294%, S: 0.0294%, with the balance being Fe.

[0043] The preparation method of the additive component in Example 4 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 800 mm / s, the laser power is 180 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0044] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 1128 MPa, the yield strength was 851 MPa, and the elongation after fracture was 11.8%. The tensile strength perpendicular to the substrate was 1139 MPa, the yield strength was 899 MPa, and the elongation after fracture was 11.4%. Example 5

[0045] The preparation method of stainless steel composite powder for additive manufacturing in Example 5 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 3% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-material mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0046] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.49%, Ni: 11.82%, Mo: 2.425%, Zr: 2.13%, Cu: 0.462%, Ti: 0.345%, Be: 0.06%, Mn: 1.94%, Si: 0.97%, N: 0.097%, P: 0.0437%, C: 0.0291%, S: 0.0291%, with the balance being Fe.

[0047] The preparation method of the additive component in Example 5 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 800 mm / s, the laser power is 180 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0048] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was fabricated into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 1219 MPa, the yield strength was 1002 MPa, and the elongation after fracture was 14.1%. The tensile strength perpendicular to the substrate was 1208 MPa, the yield strength was 995 MPa, and the elongation after fracture was 15%. Example 6

[0049] The preparation method of stainless steel composite powder for additive manufacturing in Example 6 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 4% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-powder mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0050] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.32%, Ni: 11.76%, Mo: 2.4%, Zr: 2.84%, Cu: 0.616%, Ti: 0.46%, Be: 0.08%, Mn: 1.92%, Si: 0.96%, N: 0.096%, P: 0.0432%, C: 0.0288%, S: 0.0288%, with the balance being Fe.

[0051] The preparation method of the additive component in Example 6 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 800 mm / s, the laser power is 180 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0052] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 1071 MPa, the yield strength was 829 MPa, and the elongation after fracture was 10.1%. The tensile strength perpendicular to the substrate was 1099 MPa, the yield strength was 851 MPa, and the elongation after fracture was 11%. Example 7

[0053] The preparation method of stainless steel composite powder for additive manufacturing in Example 7 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 5% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-material mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0054] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.15%, Ni: 11.7%, Mo: 2.375%, Zr: 3.55%, Cu: 0.77%, Ti: 0.575%, Be: 0.1%, Mn: 1.9%, Si: 0.95%, N: 0.095%, P: 0.0428%, C: 0.0285%, S: 0.0285%, with the balance being Fe.

[0055] The method for preparing the additive component in Example 7 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 800 mm / s, the laser power is 180 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0056] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 928 MPa, the yield strength was 829 MPa, and the elongation after fracture was 10%. The tensile strength perpendicular to the substrate was 935 MPa, the yield strength was 812 MPa, and the elongation after fracture was 10.9%. Example 8

[0057] The preparation method of stainless steel composite powder for additive manufacturing in Example 8 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 3% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-material mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0058] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.49%, Ni: 11.82%, Mo: 2.425%, Zr: 2.13%, Cu: 0.462%, Ti: 0.345%, Be: 0.06%, Mn: 1.94%, Si: 0.97%, N: 0.097%, P: 0.0437%, C: 0.0291%, S: 0.0291%, with the balance being Fe.

[0059] The method for preparing the additive component in Example 8 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 1000 mm / s, the laser power is 180 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0060] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 1195 MPa, the yield strength was 905 MPa, and the elongation after fracture was 10.9%. The tensile strength perpendicular to the substrate was 1208 MPa, the yield strength was 995 MPa, and the elongation after fracture was 10.7%. Example 9

[0061] The preparation method of stainless steel composite powder for additive manufacturing in Example 9 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 3% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-powder mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0062] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.49%, Ni: 11.82%, Mo: 2.425%, Zr: 2.13%, Cu: 0.462%, Ti: 0.345%, Be: 0.06%, Mn: 1.94%, Si: 0.97%, N: 0.097%, P: 0.0437%, C: 0.0291%, S: 0.0291%, with the balance being Fe.

[0063] The method for preparing the additive component in Example 9 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 700 mm / s, the laser power is 200 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0064] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 1027 MPa, the yield strength was 807 MPa, and the elongation after fracture was 11.5%. The tensile strength perpendicular to the substrate was 1055 MPa, the yield strength was 795 MPa, and the elongation after fracture was 12%. Example 10

[0065] The preparation method of stainless steel composite powder for additive manufacturing in Example 10 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 3% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-powder mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0066] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.49%, Ni: 11.82%, Mo: 2.425%, Zr: 2.13%, Cu: 0.462%, Ti: 0.345%, Be: 0.06%, Mn: 1.94%, Si: 0.97%, N: 0.097%, P: 0.0437%, C: 0.0291%, S: 0.0291%, with the balance being Fe.

[0067] The method for preparing the additive component in Example 10 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 900 mm / s, the laser power is 200 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0068] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 1099 MPa, the yield strength was 822 MPa, and the elongation after fracture was 15.1%. The tensile strength perpendicular to the substrate was 1080 MPa, the yield strength was 830 MPa, and the elongation after fracture was 15.8%. Example 11

[0069] The preparation method of stainless steel composite powder for additive manufacturing in Example 11 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 3% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-powder mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0070] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.49%, Ni: 11.82%, Mo: 2.425%, Zr: 2.13%, Cu: 0.462%, Ti: 0.345%, Be: 0.06%, Mn: 1.94%, Si: 0.97%, N: 0.097%, P: 0.0437%, C: 0.0291%, S: 0.0291%, with the balance being Fe.

[0071] The method for preparing the additive component in Example 11 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 800 mm / s, the laser power is 230 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0072] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 912 MPa, the yield strength was 609 MPa, and the elongation after fracture was 19%. The tensile strength perpendicular to the substrate was 920 MPa, the yield strength was 625 MPa, and the elongation after fracture was 18.8%. Example 12

[0073] The preparation method of stainless steel composite powder for additive manufacturing in Example 12 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 3% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-material mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0074] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.49%, Ni: 11.82%, Mo: 2.425%, Zr: 2.13%, Cu: 0.462%, Ti: 0.345%, Be: 0.06%, Mn: 1.94%, Si: 0.97%, N: 0.097%, P: 0.0437%, C: 0.0291%, S: 0.0291%, with the balance being Fe.

[0075] The method for preparing the additive component in Example 12 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 1000 mm / s, the laser power is 230 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0076] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 1110 MPa, the yield strength was 859 MPa, and the elongation after fracture was 13.2%. The tensile strength perpendicular to the substrate was 1120 MPa, the yield strength was 848 MPa, and the elongation after fracture was 13%. Example 13

[0077] The preparation method of stainless steel composite powder for additive manufacturing in Example 13 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 3% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-material mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0078] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.49%, Ni: 11.82%, Mo: 2.425%, Zr: 2.13%, Cu: 0.462%, Ti: 0.345%, Be: 0.06%, Mn: 1.94%, Si: 0.97%, N: 0.097%, P: 0.0437%, C: 0.0291%, S: 0.0291%, with the balance being Fe.

[0079] The method for preparing the additive component in Example 13 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 900 mm / s, the laser power is 260 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0080] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 944 MPa, the yield strength was 720 MPa, and the elongation after fracture was 18.8%. The tensile strength perpendicular to the substrate was 951 MPa, the yield strength was 712 MPa, and the elongation after fracture was 18.4%. Example 14

[0081] The preparation method of stainless steel composite powder for additive manufacturing in Example 14 includes the following steps: 316L stainless steel is prepared into stainless steel powder with a particle size of 15-53 μm by gas atomization powder preparation method; Vitreloy 1 amorphous alloy is prepared into amorphous alloy powder with a particle size of 20 μm by gas atomization powder preparation method; the stainless steel powder and amorphous alloy powder are mixed and thoroughly mixed in a ball mill, and then vacuum dried for 3 h. The amorphous alloy powder accounts for 3% of the total mass of stainless steel used for additive manufacturing. During ball milling, the ball-to-material mass ratio is 15:1, the ball milling speed is 130 r / min, and the ball milling time is 6 h. The ball milling is carried out in an atmospheric environment.

[0082] The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 16.49%, Ni: 11.82%, Mo: 2.425%, Zr: 2.13%, Cu: 0.462%, Ti: 0.345%, Be: 0.06%, Mn: 1.94%, Si: 0.97%, N: 0.097%, P: 0.0437%, C: 0.0291%, S: 0.0291%, with the balance being Fe.

[0083] The method for preparing the additive component in Example 14 includes the following steps: Stainless steel powder used for additive manufacturing is processed using the SLM additive manufacturing method under a flowing argon atmosphere to prepare a 10×10×10 cm stainless steel block, which serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 1200 mm / s, the laser power is 260 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle of the SLM additive manufacturing method is 66.7°.

[0084] Metallographic analysis revealed that the additive component exhibited a basketweave structure. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 1001 MPa, the yield strength was 786 MPa, and the elongation after fracture was 10.1%. The tensile strength perpendicular to the substrate was 1059 MPa, the yield strength was 799 MPa, and the elongation after fracture was 12%.

[0085] Comparative Example 1 The preparation method of the additive component in Comparative Example 1 includes the following steps: 316L stainless steel powder is used to prepare a 10×10×10 cm stainless steel block under a flowing argon atmosphere using the SLM additive manufacturing method. The stainless steel block serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 700 mm / s, the laser power is 180 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle is 66.7°. The 316L stainless steel powder is prepared into spherical powders with a particle size of 15–53 μm using a gas atomization powder preparation method.

[0086] Metallographic analysis revealed that the additive manufacturing component contained columnar austenite grains. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 618 MPa, the yield strength was 385 MPa, and the elongation after fracture was 38%. The tensile strength perpendicular to the substrate was 633 MPa, the yield strength was 415 MPa, and the elongation after fracture was 40%.

[0087] Comparative Example 2 The preparation method of the additive component in Comparative Example 2 includes the following steps: 316L stainless steel powder is used in a SLM additive manufacturing method to prepare a 10×10×10 cm stainless steel block under a flowing argon atmosphere. This stainless steel block serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 900 mm / s, the laser power is 180 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle is 66.7°. The 316L stainless steel powder is prepared into spherical powders with a particle size of 15–53 μm using a gas atomization powder preparation method.

[0088] Metallographic analysis revealed that the additive manufacturing component contained columnar austenite grains. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 658 MPa, the yield strength was 449 MPa, and the elongation after fracture was 41%. The tensile strength perpendicular to the substrate was 660 MPa, the yield strength was 461 MPa, and the elongation after fracture was 43%.

[0089] Comparative Example 3 The preparation method of the additive component in Comparative Example 3 includes the following steps: 316L stainless steel powder is used in a SLM additive manufacturing method to prepare a 10×10×10 cm stainless steel block under a flowing argon atmosphere. The stainless steel block serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 900 mm / s, the laser power is 200 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle is 66.7°. The 316L stainless steel powder is prepared into spherical powders with a particle size of 15–53 μm using a gas atomization powder preparation method.

[0090] Metallographic analysis revealed that the additive manufacturing component contained columnar austenite grains. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 591 MPa, the yield strength was 359 MPa, and the elongation after fracture was 50%. The tensile strength perpendicular to the substrate was 581 MPa, the yield strength was 348 MPa, and the elongation after fracture was 47%.

[0091] Comparative Example 4 The preparation method of the additive component in Comparative Example 4 includes the following steps: 316L stainless steel powder is used to prepare a 10×10×10 cm stainless steel block under a flowing argon atmosphere using the SLM additive manufacturing method. The stainless steel block serves as the additive component. The laser scanning speed of the SLM additive manufacturing method is 1000 mm / s, the laser power is 260 W, the scanning spacing is 70 μm, the powder thickness is 30 μm, and argon gas is introduced after pre-vacuuming before additive manufacturing. The interlayer rotation angle is 66.7°. The 316L stainless steel powder is prepared into spherical powders with a particle size of 15–53 μm using a gas atomization powder preparation method.

[0092] Metallographic analysis revealed that the additive manufacturing component contained columnar austenite grains. The fabricated additive component was cut into two types of specimens: one parallel to the substrate and the other perpendicular to the substrate. Following national standards for tensile testing, the additive component was prepared into tensile specimens conforming to national standards and subjected to tensile tests. The tensile strength parallel to the substrate was 532 MPa, the yield strength was 366 MPa, and the elongation after fracture was 47%. The tensile strength perpendicular to the substrate was 555 MPa, the yield strength was 371 MPa, and the elongation after fracture was 44%.

[0093] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the content of the present invention's specification shall also be included within the scope of protection of the present invention.

Claims

1. A stainless steel composite powder for additive manufacturing, characterized in that, The mass percentages of each element in the stainless steel composite powder used for additive manufacturing are as follows: Cr: 15-18%, Ni: 9.5-14.5%, Mo: 1.5-3%, Zr: 0.1-3.55%, Cu: 0.02-1%, Ti: 0.01-0.7%, Be: 0.001-0.2%, Mn≤2%, Si≤1%, N≤0.1%, P≤0.045%, C≤0.03%, S≤0.03%, with the balance being Fe.

2. A method for preparing stainless steel composite powder for additive manufacturing as described in claim 1, characterized in that, The stainless steel powder was obtained by ball milling stainless steel powder and amorphous alloy powder. The mass percentage of each element in the stainless steel powder was as follows: Cr: 16-18%, Ni: 10-14%, Mo: 2-3%, Mn≤2%, Si≤1%, N≤0.1%, P≤0.045%, C≤0.03%, S≤0.03%, with the balance being Fe. The mass percentage of each element in the amorphous alloy powder was as follows: Ti: 9.8-13.1%, Cu: 12.3-18.5%, Ni: 2.1-9.8%, Be: 0.8-3.2%, with the balance being Zr.

3. The method for preparing stainless steel composite powder for additive manufacturing according to claim 2, characterized in that, The stainless steel powder has a particle size of 15–53 μm, and the amorphous alloy powder has a particle size of 15–25 μm.

4. The method for preparing stainless steel composite powder for additive manufacturing according to claim 2, characterized in that, The ball-to-material ratio during the ball milling process is 13-15:1, the ball milling speed is 120-130 r / min, and the ball milling time is 4-6 h; after ball milling, vacuum drying is performed to obtain the stainless steel composite powder used for additive manufacturing.

5. The method for preparing stainless steel composite powder for additive manufacturing according to claim 2, characterized in that, The amorphous alloy powder accounts for 0.2 to 5% of the total mass of the stainless steel composite powder used in additive manufacturing.

6. An additive component, characterized in that, It is prepared using the stainless steel composite powder for additive manufacturing as described in claim 1.

7. A method for preparing an additive component as described in claim 6, characterized in that, Stainless steel composite powder for additive manufacturing was prepared in a flowing inert atmosphere using a selective laser melting additive manufacturing method.

8. The method for preparing the additive component according to claim 7, characterized in that, The inert atmosphere is argon.

9. The method for preparing an additive component according to claim 7, characterized in that, In the selective laser melting additive manufacturing method, the laser rotates at an angle of 60–70° between each layer.

10. The method for preparing the additive component according to claim 7, characterized in that, The selective laser melting additive manufacturing method has a laser scanning speed of 800–1200 mm / s, a laser power of 180–260 W, a scanning spacing of 60–80 μm, and a powder layer thickness of 20–40 μm.

Images