An alloy material composition and method of use

Abstract

The application discloses an alloy material composition, and raw materials for preparing the alloy material composition at least include the following components in percentage by weight: C 0.3-0.6%; Si 0.25-0.55%; Mn 0.05-0.35%; Ni 7-8.5%; Co 2.5-4%; V 0.2-0.6%; P <0.06%; S <0.03%; Cr 2-3.5%; Mo 5-7%; and the balance of Fe and inevitable impurities. The application selects specific metal elements, controls the content, and further limits the temperature and holding time of heat treatment, so that different performances can be obtained, the product with good comprehensive performance can be obtained when the alloy layer or alloy product is prepared, the hardness and toughness are considered, the product has good wear resistance and stable heat conductivity, and the requirements of work such as an aluminum product die casting die can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of 3D printing, and more particularly, the present application provides an alloy material composition and application method. BACKGROUND

[0002] H13 steel is one of the few commonly used die casting die steels, and the main defect of H13 steel is that it is relatively brittle. During the die casting process, wear and cracking are prone to occur, which requires the repair of the die casting die. In the traditional surfacing process, on the one hand, the wear resistance and toughness of the repair material cannot be considered, and in general, the higher the hardness, the worse the toughness; on the other hand, the shape of the formed weld layer is poor.

[0003] 3D printing is another commonly used die repair and manufacturing process. 3D printing manufacturing technology is an advanced manufacturing technology that integrates CAD / CAM technology, laser technology, numerical control technology, new materials and computer technology. Using three-dimensional CAD data, the 3D printing equipment is used to manufacture the cross-sectional shape of the part layer by layer, and the three-dimensional solid part is accumulated. Compared with the traditional manufacturing method, it has the outstanding advantages of short cycle, low cost, material saving, high complexity of formed parts, etc. 3D printing for die repair is a new repair technology, which lays 3D printing alloy material composition powder on the surface to be repaired to form a weld layer.

[0004] The material (consumables) used for 3D printing needs to have good bonding with the base die steel, and more importantly, it needs to have good wear resistance and toughness. At present, the types of domestic 3D printing consumables are few, and mainly rely on imports.

[0005] 18Ni(300) steel is an age hardening type plastic mold steel, which is also commonly used to manufacture die casting dies or to repair H13 steel die casting dies, but at present, 18Ni(300) steel only has a few foreign brands in Europe and the United States, and the price is very high. Therefore, it is of great significance to develop a domestic alloy material for 3D printing of die casting die steel. SUMMARY

[0006] The present application provides an alloy material composition and application method to solve the problems raised in the above technical background.

[0007] The first aspect of the present application provides an alloy material composition, the preparation raw material at least includes the following components in percentage by weight:

[0008] C 0.3-0.6%, preferably 0.35-0.5%;

[0009] Si 0.25-0.55%, preferably 0.3-0.45%;

[0010] Mn 0.05-0.35%, preferably 0.1-0.3%;

[0011] Ni 7-8.5%, preferably 7.3-8%;

[0012] Co 2.5-4%, preferably 2.9-3.7%;

[0013] V 0.2-0.6%, preferably 0.25-0.5%;

[0014] P < 0.06%, preferably < 0.05%;

[0015] S < 0.03%, preferably < 0.025%;

[0016] Cr 2-3.5%, preferably 2.3-3.5%;

[0017] Mo 5-7%, preferably 5.5-6.3%;

[0018] And the remainder of Fe and unavoidable impurities.

[0019] As a preferred embodiment of the present invention, the raw materials for preparation include at least the following components by weight percentage:

[0020] C 0.4-0.48%, preferably 0.43-0.48%;

[0021] Si 0.34-0.5%, preferably 0.38-0.42%;

[0022] Mn 0.1-0.25%, preferably 0.15-0.21%;

[0023] Ni 7.5-8%, such as 7.9%, 7.8%, 7.7%, 7.6%, etc.;

[0024] Co 3-3.5%, such as 3.1%, 3.2%, 3.3%, 3.4%, etc.;

[0025] V 0.25-0.5%, such as 0.3-0.4%;

[0026] P<0.04%;

[0027] S < 0.02%;

[0028] Cr 2.3-3.1%, preferably 2.5-3%;

[0029] Mo 5.5-6.5%, such as 5.6%, 5.8%, 6.0%, 6.1%, 6.3%, etc.;

[0030] And the remainder of Fe and unavoidable impurities.

[0031] As a preferred embodiment of the present invention, the alloy material composition is a powder with an average particle size (diameter) of 15-55 μm.

[0032] A second aspect of the present invention provides a method for applying an alloy material composition, comprising at least the following steps: providing the above-mentioned alloy material composition in powder form; 3D printing the powdered alloy material composition to obtain an alloy layer or an alloy article; and heat-treating the alloy layer or alloy article.

[0033] As a preferred embodiment of the present invention, the average particle size of the powdered alloy material composition is 15-55 μm.

[0034] In a preferred embodiment, the application method may be the repair of a die-casting mold or the preparation of a die-casting mold.

[0035] As a preferred embodiment of the present invention, the alloy material composition is applied to the product by 3D printing to obtain an alloy layer; or, the alloy product is a die-casting mold.

[0036] As a preferred embodiment of the present invention, the alloy layer is applied to an H13 steel die-casting mold.

[0037] As a preferred embodiment of the present invention, the 3D printing is SLM laser printing.

[0038] More preferably, the laser power of the SLM laser printing is 300-400W, and more preferably 320-360W.

[0039] More preferably, the laser speed of the SLM laser printing is 850-950 mm / s, and more preferably 880-920 mm / s.

[0040] More preferably, the diameter of the laser spot in the SLM laser printing is 80-200μm, preferably 100-180μm, and more preferably 130-150μm.

[0041] More preferably, the line spacing of the SLM laser printing is 0.05-0.15 mm.

[0042] As a preferred embodiment of the present invention, the heat treatment is an annealing treatment, and the annealing temperature is 450-680℃, more preferably 480-660℃, and especially preferably 600-660℃, such as 620℃, 640℃, etc., and especially preferably 640℃.

[0043] As a preferred embodiment of the present invention, the heat treatment holding time is 0.5-3.5h, more preferably 1-2.5h, and even more preferably 1.5-2h.

[0044] Beneficial effects: By selecting specific metallic elements and controlling their content, as well as further limiting the temperature and holding time of heat treatment, different properties can be obtained. This is beneficial for obtaining products with better comprehensive performance when making alloy layers or alloy products, taking into account both hardness and toughness, and having good wear resistance and stable thermal conductivity, which can meet the requirements of work such as die casting molds for aluminum products. Attached Figure Description

[0045] The accompanying drawings, which constitute a part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0046] In the attached diagram:

[0047] Figure 1 This is a heat treatment temperature curve showing the effect of the hardness and thermal properties of the composition in this application;

[0048] Figure 2A Electron micrograph of the metallographic structure after heat treatment at 470℃ (100x magnification)

[0049] Figure 2B Electron micrograph of the metallographic structure after heat treatment at 470℃ (magnified 400x);

[0050] Figure 3A Electron micrograph of the metallographic structure after heat treatment at 550℃ (100x magnification)

[0051] Figure 3B Electron micrograph of the metallographic structure after heat treatment at 550℃ (400x magnification);

[0052] Figure 4A Electron micrograph of the metallographic structure after heat treatment at 640℃ (100x magnification)

[0053] Figure 4B Electron micrograph of the metallographic structure after heat treatment at 640℃ (400x magnification);

[0054] Figure 5A Electron micrograph of the metallographic structure after heat treatment at 660℃ (100x magnification)

[0055] Figure 5B Electron micrograph of the metallographic structure after heat treatment at 660℃ (400x magnification);

[0056] Figure 6 This is the wear resistance test curve. Detailed Implementation

[0057] To make the objectives, technical solutions, and effects of this application clearer and more explicit, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0058] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0059] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1 to 5” is disclosed, the described range should be interpreted as including the ranges “1 to 4”, “1 to 3”, “1 to 2”, “1 to 2 and 4 to 5”, “1 to 3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0060] Furthermore, the indefinite articles “a” and “an” preceding the elements or components of this invention do not impose any limitation on the quantity (i.e., number of occurrences) of the elements or components. Therefore, “an” or “a” should be interpreted as including one or at least one, and the singular form of an element or component also includes the plural form, unless the quantity clearly refers only to the singular form.

[0061] To solve the above-mentioned technical problems, a first aspect of the present invention provides an alloy material composition, wherein the raw materials for preparation, by weight percentage, include at least the following components: C 0.3-0.6%, Si 0.25-0.55%, Mn 0.05-0.35%, Ni 7.4-8.5%, Co 2.5-4%, V 0.2-0.6%, P<0.06%, S<0.03%, Cr 2-3.5%, Mo 5-7%, and the balance being Fe and unavoidable impurities.

[0062] In a preferred embodiment, the raw materials, by weight percentage, comprise at least the following components: C 0.35-0.5%; Si 0.3-0.45%; Mn 0.1-0.3%; Ni 7.3-8%; Co 2.9-3.7%; V 0.25-0.5%; P < 0.05%; S < 0.025%; Cr 2.1-3.4%; Mo 5.5-6.3%; and the balance being Fe and unavoidable impurities.

[0063] In a preferred embodiment, the raw materials, by weight percentage, further include at least the following components: C 0.4-0.48% (preferably 0.43-0.48%), Si 0.34-0.5% (preferably 0.38-0.42%), Mn 0.1-0.25% (preferably 0.15-0.21%), Ni 7.5-8%, Co 3.-3.5%, V 0.25-0.5%, P < 0.04%, S < 0.02%, Cr 2.3-3.1% (preferably 2.5-3%), Mo 5.5-6.5%, and the balance being Fe and unavoidable impurities.

[0064] In this invention, the carbon (C) content, by weight percentage, is preferably set in the range of 0.4-0.48%, particularly 0.43-0.48%. The C content can be 0.4%, 0.42%, 0.44%, 0.46%, or 0.48%, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within the above range, the C content readily forms alloy carbides with carbon in the alloy material, improving wear resistance. Higher content, however, reduces the toughness of the alloy material, making it prone to cracking during heat treatment.

[0065] The present invention preferably sets the silicon (Si) content within a range of 0.34-0.5%, particularly 0.38-0.42%. The Si content can be 0.38%, 0.39%, 0.40%, 0.41%, or 0.42%, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within the above range, the Si content can form silicides with other elements in the alloy material. Silicides have high hardness and can simultaneously control the migration and precipitation of C atoms in the repair die steel, thus increasing stability during annealing. Exceeding the above content range will lead to segregation and increased material brittleness.

[0066] The present invention sets the preferred range of manganese (Mn) content to 0.1-0.25%, particularly 0.15-0.21%. The Mn content can be 0.15%, 0.17%, 0.19%, or 0.21%, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within the above range, the Mn content can form manganese compounds with other elements in the alloy material, which can improve the hardness and strength of the alloy material.

[0067] In this invention, the nickel (Ni) content is set at 7-8.5%, most preferably 7.5-8%. The Ni content can be 7.5%, 7.6%, 7.7%, 7.8%, or 7.9%, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within the above range, the Ni content can interact with elements such as chromium, molybdenum, cobalt, and carbon in the alloy material, thereby improving the mechanical properties and corrosion resistance of the alloy.

[0068] In this invention, the cobalt (Co) content is set at 2-3.5%, preferably 2.3-3.5%, and especially 3-3.5%. The Co content can be 3.1%, 3.16%, 3.2%, 3.22%, 3.28%, 3.3%, 3.33%, 3.4%, 3.45%, 3.5%, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within the above range, the Co content can interact with elements such as chromium, molybdenum, and nickel in the alloy material, thereby improving the alloy's strength, thermal stability, and wear resistance.

[0069] In this invention, the preferred range for the vanadium (V) content is set at 0.25-0.5%, particularly 0.3-0.4%. The V content can be 0.3%, 0.32%, 0.34%, 0.36%, or 0.4%, but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within the above range, the V content can interact with elements such as chromium, molybdenum, and nickel in the alloy material, thereby improving the hardness, strength, heat resistance, wear resistance, and corrosion resistance of the alloy steel.

[0070] In this invention, the phosphorus (P) content is preferably set to <0.04%. The P content can be 0.03%, 0.02%, 0.01%, or 0.005%, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within the above range, the P content can interact with other elements in the alloy material, thereby improving the alloy's hardness and strength. Simultaneously, it accumulates at grain boundaries, promoting clear grain boundaries and thus improving the alloy's toughness and ductility. However, the P content should not be too high, otherwise it will also lead to increased brittleness.

[0071] In this invention, the sulfur (S) content is preferably set at <0.02%. The S content can be 0.018%, 0.016%, 0.014%, 0.01%, or 0.005%, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. The S content within the above range provides good lubrication, but excessive sulfur will damage the grain boundary structure of the alloy, making it prone to cracking.

[0072] In this invention, the chromium (Cr) content is set at 2.3-3.1%, preferably 2.5-3%. The Cr content can be 2.3%, 2.5%, 2.7%, 2.9%, or 3.1%, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within the above range, the Cr content can interact with other elements in the alloy material, resulting in a finer grain size and better corrosion resistance.

[0073] In this invention, the preferred range for the molybdenum (Mo) content is set at 5.5-6.3%, more preferably 5.5-6.5%. The Mo content can be 5.6%, 5.8%, 5.9%, 6.0%, 6.1%, 6.3%, etc., but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within the above range, the Mo content can interact with other elements in the alloy material to improve the alloy's wear resistance and high-temperature resistance.

[0074] A second aspect of the present invention provides a method for applying an alloy material composition, comprising at least the following steps: providing the above-mentioned alloy material composition in powder form; 3D printing the powdered alloy material composition to obtain an alloy layer or an alloy product; and heat-treating the alloy layer or alloy product.

[0075] The powdered alloy material composition of the present invention is mainly in the form of spherical particles, wherein the average particle size of the powdered alloy material composition is less than or equal to 300 μm. Preferably, the average particle size of the powdered alloy material composition is greater than or equal to 10 μm and less than or equal to 60 μm. In a more preferred embodiment, the average size of the powdered alloy material composition is 15-55 μm; more preferably, the average size of the powdered alloy material composition is 15-53 μm.

[0076] The powdered alloy material composition can be prepared by gas atomization. Gas atomization powder preparation technology is currently the mainstream method for preparing spherical powders, and the resulting powders are suitable for 3D printing.

[0077] In a preferred embodiment, the alloy material composition is 3D printed onto the article to obtain an alloy layer; or, the alloy article is a die-casting mold, especially an aluminum article or an aluminum alloy article.

[0078] In a preferred embodiment, the alloy material composition is 3D printed onto an article to obtain an alloy layer, the article being an H13 steel product, such as an H13 steel die-casting mold, especially an aluminum product or an aluminum alloy product die-casting mold.

[0079] In a preferred embodiment, the 3D printing is SLM laser printing. SLM, or Selective Laser Melting, is an advanced prototyping process. It uses high-energy laser energy to melt corresponding mixed powder materials layer by layer to rapidly produce the required parts, providing the possibility of realizing the design and manufacture of complex integral structures.

[0080] In a preferred embodiment, the laser printing process conditions are preferably: laser power of 320-360W, laser speed of 880-920mm / s, laser spot diameter of 80-200μm, and line spacing of 0.05-0.15mm; more preferably, the laser power of the laser printing is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm.

[0081] In a preferred embodiment, the thickness of the laser-printed alloy layer is 45-55 μm; more preferably, the thickness of the alloy layer is 50 μm.

[0082] In a preferred embodiment, the atmosphere used for laser printing is argon or nitrogen.

[0083] In a preferred embodiment, the 3D printing equipment is model FS273M-2, including but not limited to those purchased from Hunan Huashu High Technology Co., Ltd.

[0084] The properties of alloy materials are not simply determined by the sum of the properties of the aforementioned elements; the microstructure, such as the metallographic structure, also has a significant impact on alloy properties. Among these, heat treatment is an important factor affecting the metallographic structure.

[0085] In a preferred embodiment, the heat treatment is an annealing treatment. Preferably, the annealing temperature is 450-680℃ and the holding time is 0.5-3.5h; more preferably, the heat treatment temperature is 600-660℃ and the holding time is 1-3h; even more preferably, the heat treatment temperature is 620-640℃ and the holding time is 1.5-2.5h; even more preferably, the heat treatment temperature is 640℃ and the holding time is 2h.

[0086] By controlling the content of the aforementioned components and further defining the heat treatment, this application can obtain products with different properties. In particular, when the heat treatment temperature is 640℃ and the holding time is 2h, the prepared alloy layer or alloy product has good comprehensive performance, balancing hardness and toughness. Under working conditions of 400℃, it exhibits good wear resistance and stable thermal conductivity, which can meet the requirements of aluminum product die-casting molds. This may be because when the 3D printing alloy material is composed of the aforementioned multiple metal elements, the atomic bonding mode between these metal elements changes after high-temperature melting during the 3D printing process, forming a new grain structure. After annealing at a specific temperature and time, the internal composition of the alloy becomes more uniform, the grain size is smaller, the distance between each phase is closer, and the thermal defects in the alloy are correspondingly reduced. The generated micrograins easily produce dislocation sources, increasing the number of dislocation slips, which is beneficial to improving toughness. At the same time, it makes the heat energy in the alloy material easier to transfer, thereby improving its thermal conductivity. In addition, the fine grains can make the alloy material more compact, thereby improving the hardness and wear resistance of the alloy material.

[0087] To better understand the above technical solutions, a detailed description of the specific implementation methods will be provided below. It is important to note that the following embodiments are only for further illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention still fall within the scope of protection of the present invention. Furthermore, unless otherwise stated, all raw materials used are commercially available.

[0088] Example 1:

[0089] Example 1 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0090] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0091] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0092] The heat treatment temperature is 660℃, and the holding time is 15 minutes.

[0093] Example 2:

[0094] Example 2 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0095] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0096] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0097] The heat treatment temperature is 660℃, and the holding time is 2 hours.

[0098] Example 3:

[0099] Example 3 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0100] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0101] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0102] The heat treatment temperature is 640℃, and the holding time is 2 hours.

[0103] Example 4:

[0104] Example 4 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0105] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0106] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0107] The heat treatment temperature is 620℃, and the holding time is 2 hours.

[0108] Example 5:

[0109] Example 5 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, with the balance being Fe.

[0110] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0111] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0112] The heat treatment temperature is 600℃, and the holding time is 2 hours.

[0113] Example 6:

[0114] Example 6 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0115] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0116] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0117] The heat treatment temperature is 550℃, and the holding time is 2 hours.

[0118] Example 7:

[0119] Example 7 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0120] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0121] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0122] The heat treatment temperature is 530℃, and the holding time is 2 hours.

[0123] Example 8:

[0124] Example 8 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0125] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0126] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0127] The heat treatment temperature is 510℃, and the holding time is 2 hours.

[0128] Example 9:

[0129] Example 9 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0130] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0131] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0132] The heat treatment temperature is 490℃, and the holding time is 2 hours.

[0133] Example 10:

[0134] Example 10 of the present invention provides a test sample of an alloy material composition, the raw materials of which, by weight percentage, include the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0135] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0136] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0137] The heat treatment temperature is 470℃, and the holding time is 2 hours.

[0138] Example 11:

[0139] Example 11 of the present invention provides a test sample of an alloy material composition, the raw materials of which, by weight percentage, include the following components: C 0.44%, Si 0.40%, Mn 0.18%, Cr 2.7%, Mo 5.9%, Ni 7.6%, Co 3.2%, V 0.35%, P 0.034%, S 0.016%, and the balance Fe.

[0140] A powdered alloy material composition is provided; the powdered alloy material composition is 3D printed and then heat-treated to obtain a test sample. The powdered alloy material composition can be prepared by gas atomization or by assembling metal powders. The average powder size is 35 μm.

[0141] The 3D printing uses SLM laser printing in an argon atmosphere; the laser power is 340W, the laser speed is 900mm / s, the laser spot diameter is 140μm, and the line spacing is 0.1mm. The 3D printing equipment is model FS273M-2 (purchased from Hunan Huashu High Technology Co., Ltd.).

[0142] The heat treatment temperature is 450℃, and the holding time is 2 hours.

[0143] Table 1 shows the performance test results of each sample in the above embodiments.

[0144] Table 1. Performance test results of samples obtained in Examples 1-11

[0145] Example Impact absorption work KV2 Hardness HRC 1 13.9J -- 2 16.6J 43 3 8.2J 51.6 4 7.7J 48.5 5 7.1J 51.3 6 3.9J 54.5 7 5.3J 54 8 3.7J 56.4 9 3.6J 55.8 10 3.2J 57 11 3.0 56.4

[0146] Sample size: 10*10*55mm, no defects;

[0147] Test conditions: Laboratory temperature 26℃, relative humidity 45%RH; test temperature 20℃;

[0148] Hardness testing method GB / T 230.1-2018 Part I (HR-150A Rockwell hardness tester SB-06); two samples were randomly selected, and the average value was taken from six tests.

[0149] Impact energy test method GB / T 229-2020 (JB-300B pendulum impact testing machine SB-03); 3 samples were randomly selected and the average value was taken.

[0150] Based on the results of Examples 1 and 2 in Table 1, if the annealing (heat treatment) time is too short, the toughness (characterized by impact absorption energy) cannot achieve the best effect. Therefore, a longer annealing time is better, and it is recommended to be between 0.5-3.5 hours, especially 2 hours.

[0151] From the results of Examples 2-11 in Table 1, it can be seen that the annealing (heat treatment) temperature affects both toughness and hardness. Annealing at 660℃ significantly improves toughness, but the hardness is very poor. Annealing at 600℃ and below, although the hardness can be maintained, the toughness becomes too poor. From the temperature effect curves... Figure 1 Surprisingly, 1) annealing at 640℃, 620℃, and 600℃ resulted in good retention of both hardness and toughness. However, within this temperature range, the relationship between hardness and temperature became unpredictable. For example, hardness decreased at 620℃ but increased at 640℃, with a small dip in the curve between 600-640℃; 2) annealing at 530℃ resulted in an unexpectedly high peak in toughness. These two changes may be related to changes in the crystal phase structure.

[0152] Metallographic examination was performed on this application, and the testing method was in accordance with GB / T 13298-2015 (4XB(C)-Z metallographic microscope SB-08, etching agent was 4% nitric acid alcohol). Figure 2A (Magnified 100 times) Figure 2B (Magnified 400 times) This is the metallographic structure after heat treatment at 470℃. The structure is relatively coarse and has a banded distribution. Figure 3A (Magnified 100 times) Figure 3B (Magnified 400x) shows the metallographic structure after heat treatment at 550℃, compared to... Figure 1 The tissue is fine, and the banded distribution has completely disappeared; Figure 4A (100x magnification) 4B (400x magnification) shows the metallographic structure after heat treatment at 640℃. Compared with the sample heat treated at 550℃, the structure is more dispersed and the banded distribution has completely disappeared, but white blocks are clearly visible. Figure 5A (Magnified 100 times) Figure 5B (Magnified 400 times) The metallographic structure is that of a sample heat-treated at 660℃. Compared with the sample heat-treated at 640℃, the structure is dispersed in fine dots and small blocks, and some fields of view show banded distribution (segregation of raw material components).

[0153] H13 steel, commonly used in die casting molds, cannot balance hardness and toughness. For example, when the hardness reaches 50 HRC after tempering, the impact absorption energy is only 6 J. If the tempering temperature is increased to improve the impact absorption energy, the hardness drops sharply to 40 HRC, making it unsuitable as a die casting mold material.

[0154] In summary, the products obtained under annealing conditions of 600-640℃, especially 640℃, have ideal hardness and toughness. The toughness significantly exceeds that of H13 steel (6J impact absorption energy) commonly used in die casting molds, and the hardness can reach that of H13 steel, meeting the requirements of die casting molds.

[0155] Example 12

[0156] Example 1 of the present invention provides a test sample of an alloy material composition, which, by weight percentage, comprises the following components: C 0.45%, Si 0.38%, Mn 0.2%, Cr 2.5%, Mo 5.8%, Ni 7.75%, Co 3.1%, V 0.33%, P 0.030%, S 0.011%, and the balance Fe.

[0157] The sample was prepared according to Example 3.

[0158] Example 13

[0159] Example 13 of the present invention provides a test sample of an alloy material composition, the raw materials of which, by weight percentage, include the following components: C 0.42%, Si 0.42%, Mn 0.16%, Cr 2.8%, Mo 6.1%, Ni 7.63%, Co 3.3%, V 0.35%, P 0.032%, S 0.012%, and the balance Fe.

[0160] The sample was prepared according to Example 3.

[0161] Table 2 shows the experimental data on the mechanical properties and thermal conductivity of products in Examples 3, 12, and 13.

[0162]

[0163] Reference Figure 6 The coefficient of friction was tested on samples 3, 12, and 13 according to GB / T1031-2009. The ink pair material was alumina ceramic ball with a diameter of 6.35 mm. The test conditions were: applied force 20 N, rotation speed 60 rpm, friction radius 13 mm, test time 20 min, and test temperature 400 °C.

[0164]

[0165] The product obtained by this application has good thermal conductivity, and the thermal conductivity is improved at 400℃. In addition, it maintains good wear resistance at 400℃, which is a commonly used temperature for die casting of aluminum or aluminum alloy products. This indicates that the product of this application is very suitable for die casting molds of aluminum or aluminum alloy products.

[0166] The specific embodiments of the present invention have been described in detail above, but they are merely examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. An alloy material composition, characterized in that, The raw material composition, by weight percentage, is as follows: C 0.3-0.6%； Si 0.25-0.55%; Mn 0.05-0.35%; Ni 7-8.5%; Co 2.5-4%; V 0.2-0.6%； P<0.06%； S<0.03%； Cr 2-3.5%； Mo 5-7%; And the remainder of Fe and unavoidable impurities.

2. The alloy material composition according to claim 1, characterized in that, The raw material composition, by weight percentage, is as follows: C is 0.35-0.5%; Si is 0.3-0.45%; Mn is 0.1-0.3%; Ni is 7.3-8%; Co ranged from 2.9% to 3.7%; V is 0.25-0.5%; P <0.05%； S <0.025%； Cr content is 2.3-3.5%; Mo is 5.5-6.3%; And the remainder of Fe and unavoidable impurities.

3. The alloy material composition according to claim 1, characterized in that, The raw material composition, by weight percentage, is as follows: C 0.4-0.48%； Si 0.34-0.5%; Mn 0.1-0.25%; Ni 7.5-8%; Co 3 -3.5%; V 0.25-0.5%； P<0.04%； S<0.02%； Cr 2.3-3.1%； Mo 5.5-6.5%; And the remainder of Fe and unavoidable impurities.

4. The alloy material composition according to claim 3, characterized in that, The raw material composition, by weight percentage, is as follows: C is 0.43-0.48%; Si is 0.38-0.42%; Mn is 0.15-0.21%; Ni is selected from 7.9%, 7.8%, 7.7%, or 7.6%; Co is selected from 3.1%, 3.2%, 3.3%, or 3.4%; V is 0.3-0.4%; P<0.04%； S<0.02%； Cr is 2.5-3%; Mo is selected from 5.6%, 5.8%, 6.0%, 6.1% or 6.3%; And the remainder of Fe and unavoidable impurities.

5. The alloy material composition according to claim 1, characterized in that, The alloy material composition is a powder with an average particle size of 15-55 μm.

6. A method for applying the alloy material composition of claim 1, characterized in that, At least the following steps are included: The above-mentioned alloy material composition is provided in powder form; the powdered alloy material composition is 3D printed to obtain an alloy layer or alloy product, and the alloy layer or alloy product is heat treated.

7. The application method according to claim 6, characterized in that, The application method is for repairing or preparing die-casting molds.

8. The application method according to claim 6, characterized in that, The alloy material composition is applied to the product by 3D printing to obtain an alloy layer; or, the alloy product is a die-casting mold.

9. The application method according to claim 6 or 8, characterized in that, The 3D printing is SLM laser printing.

10. The application method according to claim 9, characterized in that, The laser power of the SLM laser printing is 300-400W; the laser spot diameter of the SLM laser printing is 80-200μm; and the line spacing of the SLM laser printing is 0.05-0.15mm.

11. The application method according to claim 10, characterized in that, The laser power of the SLM laser printing is 320-360W; the laser spot diameter of the SLM laser printing is 100-180μm; and the line spacing of the SLM laser printing is 0.05-0.15mm.

12. The application method according to claim 11, characterized in that, The laser spot diameter of the SLM laser printing is 130-150μm.

13. The application method according to claim 6, characterized in that, The heat treatment is annealing, and the annealing temperature is 450-680℃.

14. The application method according to claim 13, characterized in that, The annealing temperature is 480-660℃.

15. The application method according to claim 14, characterized in that, The annealing temperature is 600-660℃.

16. The application method according to claim 15, characterized in that, The annealing temperature is selected from 620℃ or 640℃.

17. The application method according to claim 6, characterized in that, The heat treatment holding time is 0.5-3.5 hours.

18. The application method according to claim 17, characterized in that, The heat treatment holding time is 1-2.5 hours.

19. The application method according to claim 18, characterized in that, The heat treatment holding time is 1.5-2 hours.

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