A kind of wear-resistant high manganese steel and preparation method thereof

Abstract

The present invention relates to the technical field of metal casting, and specifically discloses a wear-resistant high manganese steel and a preparation method thereof. The wear-resistant high manganese steel provided by the present invention is composed of the following chemical components: C: 0.05% to 0.15%, Mn: 12% to 28%, Al: 8% to 12%, Si: 0.3% to 0.9%, Mo: 0.05% to 0.12%, Ti: 0.05% to 0.15%, V: 0.05% to 0.10%, Ni: 3% to 8%, and the remainder is Fe and inevitable impurities. The high manganese steel provided by the present invention uses carbon, manganese and aluminum as main elements, and further controls the addition amount of silicon, molybdenum, titanium, vanadium and nickel, and compositely strengthens the elements, and improves the strength and wear resistance of the high manganese steel by stabilizing austenite, promoting the precipitation of B2 phase, promoting the formation of carbides, and inhibiting the coarsening of nano-precipitation phases, etc., which has important practical value for actual production.

Description

Technical Field

[0001] The invention relates to the technical field of metal casting, and in particular to wear-resistant high manganese steel and a preparation method thereof. Background Art

[0002] High manganese steel is an indispensable and huge amount of traditional metal material, which is widely used in the fields of automobiles, railways, agricultural machinery and tools. Therefore, this requires that the existing high manganese steel needs to have the characteristics of light weight, high strength and wear resistance. However, the existing high manganese steel still has certain limitations in improving strength and wear resistance. At present, researchers usually improve the strength of high manganese steel by adding a certain amount of alloy elements to high manganese steel, but the addition of alloy elements will increase the cost of the material, and improper addition of alloy elements will also affect other properties of the material; there are also researchers who further improve the wear resistance of high manganese steel by nitriding the surface of high manganese steel, but surface strengthening technology may increase manufacturing costs, and the treatment of the material surface needs to be precisely controlled, otherwise it will have an adverse effect on the overall performance of the material. Therefore, in view of the problem that the existing high manganese steel processing process is complicated and the prepared high manganese steel cannot have both high strength and high wear resistance, it is of great significance to provide a wear-resistant high manganese steel and its preparation method. Summary of the invention

[0003] In view of this, the present invention provides a wear-resistant high manganese steel and a preparation method thereof. The high manganese steel provided by the present invention has carbon, manganese and aluminum as main elements, and further controls the addition amount of silicon, molybdenum, titanium, vanadium and nickel, and compositely strengthens the elements, thereby improving the strength and wear resistance of the high manganese steel by stabilizing austenite, promoting the precipitation of B2 phase, promoting the formation of carbides, and inhibiting the coarsening of nano-precipitated phases, and has important practical value for actual production.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] The first aspect of the present invention provides a wear-resistant high manganese steel, which is composed of the following chemical components, measured by mass percentage: C: 0.05%~0.15%, Mn: 12%~28%, Al: 8%~12%, Si: 0.3%~0.9%, Mo: 0.05%~0.12%, Ti: 0.05%~0.15%, V: 0.05%~0.10%, Ni: 3%~8%, and the balance is Fe and unavoidable impurities.

[0006] Compared with the prior art, the wear-resistant high manganese steel provided by the present invention is based on the lightweight design concept of low carbon, high manganese and high aluminum, and is supplemented with several alloy elements such as silicon, molybdenum, titanium, vanadium and nickel. Among them, the aluminum element can not only make the high manganese steel lightweight, but also a specific content of the aluminum element can improve the strength and wear resistance of the high manganese steel by generating a B2 phase; the nickel element can also cooperate with the aluminum to generate a stable B2 phase on the premise of ensuring the stability of the austenite of the high manganese steel, thereby improving the strength and wear resistance of the high manganese steel; the nickel content further limited by the present invention is conducive to maximizing the precipitation amount of the B2 phase, thereby maximizing the performance of the high manganese steel; the addition of molybdenum, titanium and vanadium can form carbides in the high manganese steel during the processing, thereby improving the wear resistance of the high manganese steel, and the carbides can further improve the strength of the high manganese steel by inhibiting grain growth and precipitating at the grain boundaries; by limiting the content of the molybdenum element, the coarsening of the nano-precipitated phase can also be effectively hindered, so that the strength and wear resistance of the high manganese steel are more excellent.

[0007] The high manganese steel provided by the present invention has carbon, manganese and aluminum as main elements, and further controls the addition amount of silicon, molybdenum, titanium, vanadium and nickel to achieve composite strengthening among the elements, thereby improving the strength and wear resistance of the high manganese steel by stabilizing austenite, promoting the precipitation of B2 phase, promoting the formation of carbides and inhibiting the coarsening of nano-precipitated phases, and has important practical value for actual production.

[0008] The second aspect of the present invention provides a method for preparing the above-mentioned wear-resistant high manganese steel, comprising the following steps:

[0009] S1. In an inert atmosphere, C, Fe and Mn are first smelted at 1500°C to 1700°C to obtain a first molten steel; Si, Ni, Al, Ti, Mo and V are added to the first molten steel, and then a second smelting is performed at 1550°C to 1600°C, and the smelting is performed at a rate of 90°C / s to 100°C / s to room temperature to obtain a slab;

[0010] S2. In an inert atmosphere, the slab is subjected to a solution treatment at 1100° C. to 1200° C., and then subjected to two passes of rough rolling at 1250° C. to 1300° C. to obtain a primary hot-rolled plate; the primary hot-rolled plate is subjected to a homogenization treatment at 1270° C. to 1350° C., and then subjected to one pass of finish rolling to obtain a hot-rolled plate;

[0011] S3, in an inert atmosphere, keeping the hot-rolled sheet at 640° C. to 780° C., and then cold-rolling the sheet twice at 30° C. to 80° C. to obtain a cold-rolled sheet;

[0012] S4, subjecting the cold-rolled sheet to a first annealing at 700° C. to 800° C., and water cooling to obtain a primary annealing sheet; and then subjecting the primary annealing sheet to a second annealing at 450° C. to 550° C., and water cooling to obtain an annealing sheet;

[0013] S5. Using C, Co and W as mixed laser cladding powder to perform laser cladding on the surface of the annealed plate, and cooling the plate to obtain wear-resistant high manganese steel.

[0014] Compared with the prior art, the wear-resistant high manganese steel provided by the present invention has a cooling rate limited in S1. By limiting the flash cooling rate, the time for grain growth and formation can be significantly shortened, thereby achieving grain refinement and improving the strength of the high manganese steel; by heat-treating the slab at a specific temperature and then performing rough rolling, finish rolling and cold rolling at a specific temperature, the grains on both sides of the surface of the high manganese steel are more easily deformed to form finer grains, while the middle structure is far from the rolling range, is less stressed, and has a large grain size, so that the prepared cold-rolled plate initially forms a specific heterogeneous structure with different grain sizes on both sides and the middle grain, thereby greatly improving the strength and wear resistance of the high manganese steel; further, the present invention The document also specifies the two annealing temperatures for the cold-rolled sheet. The specific annealing temperature can make the heterogeneity of the grains on both sides and the middle grain size more obvious, and can further promote the high manganese steel structure to produce more B2 phase and carbides, so that compounds such as NiAl, TiC and VC are fully precipitated, thereby improving the strength and wear resistance of the high manganese steel; water cooling treatment is used after the first annealing and the second annealing, which can reduce the austenite grain size in the high manganese steel, thereby achieving the effects of precipitation strengthening and fine grain strengthening. More precipitates and finer grain size greatly improve the strength and wear resistance of the high manganese steel; by cladding a specific cladding coating on the surface of the high manganese steel, the wear resistance of the high manganese steel is further improved.

[0015] Preferably, in S1, Mn, Si, Ni, Al, Ti, Mo and V are added in the form of single substances, and C and Fe are added in the form of alloys.

[0016] Preferably, in S1, the first smelting time is 2h~6h.

[0017] Preferably, in S1, the second smelting time is 30 min to 45 min.

[0018] Preferably, in S1, argon blowing and stirring are required during both the first smelting and the second smelting.

[0019] Further preferably, the pressure of argon blowing during the first smelting and the second smelting is 0.5 MPa.

[0020] Further preferably, the flow rate of argon during the first smelting and the second smelting is 8 L / min.

[0021] Further preferably, the rate of argon blowing and stirring during the first smelting is 60 rpm to 80 rpm.

[0022] Further preferably, the stirring rate of argon blowing during the second smelting is 80 rpm to 100 rpm.

[0023] Preferably, in S2, the solution treatment time is 10h~18h.

[0024] Preferably, in S2, the relative reduction ratio of the first rough rolling in the two rough rolling passes is 40% to 45%, and the relative reduction ratio of the second rough rolling pass is 30% to 35%.

[0025] The optimal relative reduction rate is conducive to the formation of specific heterogeneous structures, thereby improving the strength of high manganese steel.

[0026] Preferably, in S2, the thickness of the primary hot-rolled plate is 12 mm to 15 mm.

[0027] Preferably, in S2, the homogenization treatment time is 40 min to 60 min.

[0028] Preferably, in S2, the thickness of the hot-rolled plate is 4 mm to 5.76 mm.

[0029] Preferably, in S3, the insulation time is 70 min to 90 min.

[0030] Preferably, in S3, the relative reduction ratio of the first cold rolling pass in the two cold rolling passes is 30% to 35%.

[0031] The optimal relative reduction rate is conducive to the formation of specific heterogeneous structures, thereby improving the strength of high manganese steel.

[0032] Preferably, in S3, the thickness of the cold-rolled sheet is 2 mm to 3.5 mm.

[0033] Preferably, in S2 and S3, the two rough rolling passes, the one finish rolling pass and the two cold rolling passes are all single longitudinal rolling.

[0034] Preferably, in S4, the holding time during the first annealing is 25 min to 30 min.

[0035] Preferably, in S4, the holding time during the second annealing is 5 min to 10 min.

[0036] The optimal annealing time can promote the production of B2 phase and carbide in the high manganese steel structure to the greatest extent, thereby improving the wear resistance and strength of the high manganese steel.

[0037] Preferably, in S4, the first annealing is completed by water cooling to 20°C-35°C.

[0038] Preferably, in S4, the second annealing is performed by water cooling to 20° C. to 35° C.

[0039] Preferably, in S5, the mass percentage of C in the mixed laser cladding powder is 3% to 5%, the mass percentage of Co is 10% to 15%, and the mass percentage of W is 80% to 87%.

[0040] The optimal ratio can maximize the wear resistance of high manganese steel.

[0041] Preferably, in S5, the particle size of the mixed laser cladding powder is 120 μm to 200 μm.

[0042] Preferably, in S5, the laser power of the laser cladding is 900W~1200W.

[0043] Preferably, in S5, the laser scanning speed of the laser cladding is 300 mm / min to 500 mm / min.

[0044] Preferably, in S5, the powder feeding rate of the laser cladding is 0.3r / min~0.8r / min.

[0045] Further preferably, in S5, the thickness of the laser cladding coating is 1 mm to 2 mm.

[0046] Further preferably, the cladding coating is divided into 2 to 5 cladding processes.

[0047] Further preferably, the thickness of the cladding layer is controlled to be the same during each cladding process. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] In order to better illustrate the present invention, further examples are given below.

[0050] Example 1

[0051] The present embodiment provides a wear-resistant high manganese steel, which is composed of the following chemical components by mass percentage: C: 0.05%, Mn: 28%, Al: 8%, Si: 0.9%, Mo: 0.12%, Ti: 0.15%, V: 0.05%, Ni: 8%, and the balance is Fe and unavoidable impurities;

[0052] This embodiment provides a method for preparing the above-mentioned wear-resistant high manganese steel, comprising the following steps:

[0053] S1. In an inert atmosphere, C, Fe and Mn are melted at 1700°C for 2h. During the melting, argon blowing and stirring are required. The argon blowing pressure is 0.5MPa, the argon flow rate is 8L / min, and the argon blowing and stirring rate is 60rpm to obtain a first molten steel; Si, Ni, Al, Ti, Mo and V are added to the first molten steel, and then the molten steel is melted at 1600°C for 45min. During the melting, argon blowing and stirring are required. The argon blowing pressure is 0.5MPa, the argon flow rate is 8L / min, and the argon blowing and stirring rate is 100rpm. After the melting, the molten steel is cooled to room temperature at a rate of 100°C / s to obtain a slab;

[0054] S2. In an inert atmosphere, the slab is solution treated at 1200° C. for 10 h, and then rough rolled twice at 1250° C., wherein the relative reduction ratio of the first rough rolling is 40%, and the relative reduction ratio of the second rough rolling is 30%, to obtain a primary hot-rolled plate with a thickness of 12 mm; the primary hot-rolled plate is homogenized at 1270° C. for 40 min, and then finished rolled once to obtain a hot-rolled plate with a thickness of 5.76 mm;

[0055] S3, in an inert atmosphere, keeping the hot rolled sheet at 780°C for 90 minutes, and then performing two cold rolling passes at 30°C, wherein the relative reduction ratio of the first cold rolling pass is 30%, and a cold rolled sheet with a thickness of 3.5 mm is obtained; wherein, in S2 and S3, the two rough rolling passes, the one finishing rolling pass and the two cold rolling passes are all single longitudinal rolling;

[0056] S4, annealing the cold-rolled sheet at 700° C. for 25 min, cooling it to 20° C. with normal temperature water, to obtain a primary annealed sheet; then annealing the primary annealed sheet at 450° C. for 5 min, cooling it to 20° C. with normal temperature water, to obtain an annealed sheet;

[0057] S5. Use C, Co and W as mixed laser cladding powder to laser clad the surface of the annealed plate and cool it to obtain the wear-resistant high manganese steel; wherein the mass percentage of C in the mixed laser cladding powder is 3%, the mass percentage of Co is 12%, and the mass percentage of W is 85%; the particle size of the mixed laser cladding powder is 120 μm; the laser power of laser cladding is 900 W; the laser scanning speed of laser cladding is 500 mm / min; the powder feeding rate of laser cladding is 0.3 r / min; the thickness of the cladding coating is 2 mm, and the cladding coating is divided into 2 claddings and the thickness of the cladding layer during each cladding is controlled to be the same.

[0058] Example 2

[0059] The present embodiment provides a wear-resistant high manganese steel, which is composed of the following chemical components by mass percentage: C: 0.15%, Mn: 12%, Al: 12%, Si: 0.3%, Mo: 0.05%, Ti: 0.05%, V: 0.10%, Ni: 3%, and the balance is Fe and unavoidable impurities;

[0060] This embodiment provides a method for preparing the above-mentioned wear-resistant high manganese steel, comprising the following steps:

[0061] S1. In an inert atmosphere, C, Fe and Mn are melted at 1500°C for 6 hours. During the melting, argon blowing and stirring are required. The argon blowing pressure is 0.5 MPa, the argon flow rate is 8 L / min, and the argon blowing and stirring rate is 80 rpm to obtain a first molten steel; Si, Ni, Al, Ti, Mo and V are added to the first molten steel, and then the molten steel is melted at 1550°C for 30 minutes. During the melting, argon blowing and stirring are required. The argon blowing pressure is 0.5 MPa, the argon flow rate is 8 L / min, and the argon blowing and stirring rate is 80 rpm. After the melting, the molten steel is cooled to room temperature at a rate of 90°C / s to obtain a slab;

[0062] S2. In an inert atmosphere, the slab is solution treated at 1100° C. for 18 h, and then rough rolled twice at 1300° C., wherein the relative reduction ratio of the first rough rolling is 45%, and the relative reduction ratio of the second rough rolling is 35%, to obtain a primary hot-rolled plate with a thickness of 15 mm; the primary hot-rolled plate is homogenized at 1350° C. for 60 min, and then finished rolled once to obtain a hot-rolled plate with a thickness of 4 mm;

[0063] S3, in an inert atmosphere, keeping the hot-rolled sheet at 640° C. for 70 min, and then performing two cold rolling passes at 80° C., wherein the relative reduction ratio of the first cold rolling pass is 35%, and a cold-rolled sheet with a thickness of 2 mm is obtained; wherein, in S2 and S3, the two rough rolling passes, the one finishing rolling pass and the two cold rolling passes are all single longitudinal rolling;

[0064] S4, annealing the cold-rolled sheet at 800° C. for 30 min, cooling it to 35° C. with normal temperature water, to obtain a primary annealed sheet; then annealing the primary annealed sheet at 550° C. for 10 min, cooling it to 35° C. with normal temperature water, to obtain an annealed sheet;

[0065] S5. Use C, Co and W as mixed laser cladding powder to laser clad the surface of the annealed plate, and cool it to obtain the wear-resistant high manganese steel; wherein the mass percentage of C in the mixed laser cladding powder is 5%, the mass percentage of Co is 15%, and the mass percentage of W is 80%; the particle size of the mixed laser cladding powder is 200μm; the laser power of laser cladding is 1200W; the laser scanning speed of laser cladding is 300mm / min; the powder feeding rate of laser cladding is 0.8r / min; the thickness of the cladding coating of laser cladding is 1mm, and the cladding coating is divided into 5 claddings and the thickness of the cladding layer during each cladding is controlled to be the same.

[0066] Example 3

[0067] The present embodiment provides a wear-resistant high manganese steel, which is composed of the following chemical components by mass percentage: C: 0.10%, Mn: 20%, Al: 10%, Si: 0.6%, Mo: 0.10%, Ti: 0.12%, V: 0.08%, Ni: 4%, and the balance is Fe and unavoidable impurities;

[0068] This embodiment provides a method for preparing the above-mentioned wear-resistant high manganese steel, comprising the following steps:

[0069] S1. In an inert atmosphere, C, Fe and Mn are melted at 1600°C for 4h. During the melting, argon blowing and stirring are required. The argon blowing pressure is 0.5MPa, the argon flow rate is 8L / min, and the argon blowing and stirring rate is 70rpm to obtain a first molten steel; Si, Ni, Al, Ti, Mo and V are added to the first molten steel, and then the molten steel is melted at 1570°C for 40min. During the melting, argon blowing and stirring are required. The argon blowing pressure is 0.5MPa, the argon flow rate is 8L / min, and the argon blowing and stirring rate is 90rpm. After the melting, the molten steel is cooled to room temperature at a rate of 95°C / s to obtain a slab;

[0070] S2. In an inert atmosphere, the slab is solution treated at 1120° C. for 15 h, and then rough rolled twice at 1270° C., wherein the relative reduction ratio of the first rough rolling is 43%, and the relative reduction ratio of the second rough rolling is 32%, to obtain a primary hot-rolled plate with a thickness of 13 mm; the primary hot-rolled plate is homogenized at 1300° C. for 50 min, and then finished rolled once to obtain a hot-rolled plate with a thickness of 5 mm;

[0071] S3, in an inert atmosphere, keeping the hot rolled sheet at 700°C for 80 minutes, and then performing two cold rolling passes at 40°C, wherein the relative reduction ratio of the first cold rolling pass is 35%, and a cold rolled sheet with a thickness of 2.4 mm is obtained; wherein, in S2 and S3, the two rough rolling passes, the one finishing rolling pass and the two cold rolling passes are all single longitudinal rolling;

[0072] S4, annealing the cold-rolled sheet at 760° C. for 26 min, cooling it to 30° C. with normal temperature water, to obtain a primary annealed sheet; then annealing the primary annealed sheet at 500° C. for 8 min, cooling it to 30° C. with normal temperature water, to obtain an annealed sheet;

[0073] S5. Use C, Co and W as mixed laser cladding powder to laser clad the surface of the annealed plate, and cool it to obtain the wear-resistant high manganese steel; wherein the mass percentage of C in the mixed laser cladding powder is 3%, the mass percentage of Co is 10%, and the mass percentage of W is 87%; the particle size of the mixed laser cladding powder is 170μm; the laser power of laser cladding is 1000W; the laser scanning speed of laser cladding is 400mm / min; the powder feeding rate of laser cladding is 0.6r / min; the thickness of the cladding coating of laser cladding is 1.5mm, and the cladding coating is divided into 3 claddings and the thickness of the cladding layer during each cladding is controlled to be the same.

[0074] Comparative Example 1

[0075] This comparative example provides a high manganese steel, which is different from Example 1 in that Ni is replaced by an equal amount of Mo, and specifically consists of the following chemical composition: C: 0.05%, Mn: 28%, Al: 8%, Si: 0.9%, Mo: 8.12%, Ti: 0.15%, V: 0.05%, and the balance is Fe and unavoidable impurities;

[0076] The other operations are the same as those in Example 1.

[0077] Comparative Example 2

[0078] This comparative example provides a wear-resistant high manganese steel, which is different from Example 1 in that the Ni content is increased, and specifically consists of the following chemical components: C: 0.05%, Mn: 28%, Al: 8%, Si: 0.9%, Mo: 0.12%, Ti: 0.15%, V: 0.05%, Ni: 8.5%, and the balance is Fe and unavoidable impurities;

[0079] The other operations are the same as those in Example 1.

[0080] Comparative Example 3

[0081] This comparative example provides a high manganese steel, which is different from Example 1 in that: the Mo content is increased, and specifically consists of the following chemical components: C: 0.05%, Mn: 28%, Al: 8%, Si: 0.9%, Mo: 0.18%, Ti: 0.15%, V: 0.05%, Ni: 8%, and the balance is Fe and unavoidable impurities;

[0082] The other operations are the same as those in Example 1.

[0083] Comparative Example 4

[0084] This comparative example provides a high manganese steel, which is different from Example 1 in that:

[0085] S1. In an inert atmosphere, C, Fe and Mn are melted at 1700°C for 2h. During the melting, argon blowing and stirring are required. The argon blowing pressure is 0.5MPa, the argon flow rate is 8L / min, and the argon blowing and stirring rate is 60rpm to obtain a first molten steel; Si, Ni, Al, Ti, Mo and V are added to the first molten steel, and then the molten steel is melted at 1600°C for 45min. During the melting, argon blowing and stirring are required. The argon blowing pressure is 0.5MPa, the argon flow rate is 8L / min, and the argon blowing and stirring rate is 100rpm. After the melting, the molten steel is cooled to room temperature at a rate of 120°C / s to obtain a slab;

[0086] The other components and operations were the same as in Example 1.

[0087] Comparative Example 5

[0088] This comparative example provides a high manganese steel, which is different from Example 1 in that:

[0089] S2. In an inert atmosphere, the slab is solution treated at 1200° C. for 10 h, and then rough rolled at 1250° C., wherein the relative reduction ratio of the rough rolling is 40%, to obtain a primary hot-rolled plate with a thickness of 12 mm; the primary hot-rolled plate is homogenized at 1270° C. for 40 min, and then finished rolled once to obtain a hot-rolled plate with a thickness of 5.76 mm;

[0090] The other components and operations were the same as in Example 1.

[0091] Comparative Example 6

[0092] This comparative example provides a high manganese steel, which is different from Example 1 in that:

[0093] S4, annealing the cold-rolled sheet at 850° C. for 25 min, cooling it to 20° C. with normal temperature water, to obtain a primary annealed sheet; then annealing the primary annealed sheet at 450° C. for 5 min, cooling it to 20° C. with normal temperature water, to obtain an annealed sheet;

[0094] The other components and operations were the same as in Example 1.

[0095] Comparative Example 7

[0096] This comparative example provides a high manganese steel, which is different from Example 1 in that:

[0097] S4, annealing the cold-rolled sheet at 650° C. for 25 min, cooling it to 20° C. with normal temperature water, to obtain a primary annealed sheet; then annealing the primary annealed sheet at 450° C. for 5 min, cooling it to 20° C. with normal temperature water, to obtain an annealed sheet;

[0098] The other components and operations were the same as in Example 1.

[0099] Comparative Example 8

[0100] This comparative example provides a high manganese steel, which is different from Example 1 in that:

[0101] S4, annealing the cold-rolled sheet at 700° C. for 25 min, cooling it to 20° C. with normal temperature water, to obtain a primary annealed sheet; then annealing the primary annealed sheet at 400° C. for 5 min, cooling it to 20° C. with normal temperature water, to obtain an annealed sheet;

[0102] The other components and operations were the same as in Example 1.

[0103] Comparative Example 9

[0104] This comparative example provides a high manganese steel, which is different from Example 1 in that:

[0105] S4, annealing the cold-rolled sheet at 700° C. for 25 min, cooling it to 20° C. with normal temperature water, to obtain a primary annealed sheet; then annealing the primary annealed sheet at 600° C. for 5 min, cooling it to 20° C. with normal temperature water, to obtain an annealed sheet;

[0106] The other components and operations were the same as in Example 1.

[0107] Comparative Example 10

[0108] This comparative example provides a high manganese steel, which is different from Example 1 in that:

[0109] S4, annealing the cold-rolled sheet at 700° C. for 25 minutes to obtain a primary annealed sheet; then annealing the primary annealed sheet at 450° C. for 5 minutes, and cooling the sheet to 20° C. with normal temperature water to obtain an annealed sheet;

[0110] The other components and operations were the same as in Example 1.

[0111] The hardness, impact toughness, elongation, wear rate and strength-ductility product of the wear-resistant steels prepared in Examples 1-3 and Comparative Examples 1-10 were tested, wherein the elongation was tested according to GB / T10120-2013; the hardness of the wear-resistant steel was tested using a VexusMHV-1000Z Vickers hardness tester; according to GB / T229-2007, the impact energy of the sample was measured using a JBS-500B digital impact testing machine, where impact toughness = impact energy (J) / area (cm 2 ); According to the ASTM G65-04 test method, the wear-resistant steel was tested using a disc friction and wear tester model THT-1000; strength-ductility product = tensile strength × elongation. The specific test results are shown in Table 1:

[0112] Table 1

[0113]

[0114] As shown in Table 1, the wear-resistant high manganese steel provided by the present invention has excellent strength and good wear resistance. The wear-resistant high manganese steel prepared in Examples 1-3 of the present invention has a hardness of up to 493 HV, a strength-ductility product of up to 33.7%, and a wear rate as low as 3.57 mm. 3 ·N -1 ·m -1 ; And it can be seen from comparative examples 1-10 of the present invention that no matter whether the elements, element amounts or process parameters are changed, the steel prepared in the comparative examples is lower than the high manganese steel prepared in the embodiments of the present invention in terms of performance parameters such as wear resistance and strength.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing wear-resistant high manganese steel, characterized in that: The wear-resistant high manganese steel is composed of the following chemical components by mass percentage: C: 0.05%~0.15%, Mn: 12%~28%, Al: 8%~12%, Si: 0.3%~0.9%, Mo: 0.05%~0.12%, Ti: 0.05%~0.15%, V: 0.05%~0.10%, Ni: 3%~8%, and the balance is Fe and unavoidable impurities; The preparation method of the wear-resistant high manganese steel comprises the following steps: S1. In an inert atmosphere, C, Fe and Mn are first smelted at 1500°C to 1700°C to obtain a first molten steel; Si, Ni, Al, Ti, Mo and V are added to the first molten steel, and then a second smelting is performed at 1550°C to 1600°C, and the smelting is performed at a rate of 90°C / s to 100°C / s to room temperature to obtain a slab; S2. In an inert atmosphere, the slab is subjected to a solution treatment at 1100° C. to 1200° C., and then subjected to two passes of rough rolling at 1250° C. to 1300° C. to obtain a primary hot-rolled plate; the primary hot-rolled plate is subjected to a homogenization treatment at 1270° C. to 1350° C., and then subjected to one pass of finish rolling to obtain a hot-rolled plate; S3, in an inert atmosphere, keeping the hot-rolled sheet at 640° C. to 780° C., and then cold-rolling the sheet twice at 30° C. to 80° C. to obtain a cold-rolled sheet; S4, subjecting the cold-rolled sheet to a first annealing at 700° C. to 800° C., and water cooling to obtain a primary annealing sheet; and then subjecting the primary annealing sheet to a second annealing at 450° C. to 550° C., and water cooling to obtain an annealing sheet; S5. Using C, Co and W as mixed laser cladding powder to perform laser cladding on the surface of the annealed plate, and cooling to obtain wear-resistant high manganese steel.

2. The method for preparing wear-resistant high manganese steel according to claim 1, characterized in that: In S1, the first smelting time is 2h~6h; and / or In S1, the second smelting time is 30min~45min.

3. The method for preparing wear-resistant high manganese steel according to claim 1, characterized in that: In S2, the solution treatment time is 10h~18h; and / or In S2, the relative reduction rate of the first rough rolling in the two rough rolling passes is 40% to 45%, and the relative reduction rate of the second rough rolling pass is 30% to 35%.

4. The method for preparing wear-resistant high manganese steel according to claim 1, characterized in that: In S2, the thickness of the primary hot-rolled plate is 12 mm to 15 mm; and / or In S2, the homogenization treatment time is 40min to 60min; and / or In S3, the insulation time is 70 min to 90 min.

5. The method for preparing wear-resistant high manganese steel according to claim 1, characterized in that: In S3, the relative reduction ratio of the first cold rolling pass in the two cold rolling passes is 30% to 35%; and / or In S3, the thickness of the cold-rolled sheet is 2 mm to 3.5 mm.

6. The method for preparing wear-resistant high manganese steel according to claim 1, characterized in that: In S4, the holding time during the first annealing is 25 min to 30 min.

7. The method for preparing wear-resistant high manganese steel according to claim 1, characterized in that: In S4, the holding time during the second annealing is 5 min to 10 min.

8. The method for preparing wear-resistant high manganese steel according to claim 1, characterized in that: In S5, the mass percentage of C in the mixed laser cladding powder is 3% to 5%, the mass percentage of Co is 10% to 15%, and the mass percentage of W is 80% to 87%.

9. The method for preparing wear-resistant high manganese steel according to claim 1, characterized in that: In S5, the particle size of the mixed laser cladding powder is 120 μm to 200 μm; and / or In S5, the laser power of the laser cladding is 900W~1200W; and / or In S5, the laser scanning speed of the laser cladding is 300 mm / min to 500 mm / min; and / or In S5, the powder feeding rate of the laser cladding is 0.3r / min~0.8r / min; and / or In S5, the thickness of the laser cladding coating is 1 mm to 2 mm.

Images