An iron-based coating for high manganese steel surface and a preparation method thereof

Abstract

The present invention proposes an iron-based coating for high manganese steel surface and a preparation method thereof, the method comprising: pre-treating the surface of the high manganese steel substrate so that the surface of the high manganese steel substrate is free of oxide layer, scratches and stains; weighing a plurality of iron-based powders, ball-milling the iron-based powders to obtain iron-based powders with a particle size of 200-300 meshes; placing the pre-treated high manganese steel substrate horizontally on the workbench of a plasma cladding machine, and then placing the ball-milled iron-based powder into a powder barrel of a plasma cladding device, setting the cladding process parameters of the plasma cladding device, and controlling the cladding process to synchronously deliver the iron-based powder under an argon atmosphere, and obtaining an iron-based coating after cladding. The present application can solve the technical problem of poor wear resistance of high manganese steel under conditions of low impact load and small deformation in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of coating material synthesis, and in particular to an iron-based coating for the surface of high manganese steel and a preparation method thereof. Background Art

[0002] High manganese steel is a wear-resistant steel with an austenite matrix structure that has good toughness and work-hardening ability. Under high impact loads or large extrusion deformations, the stressed surface of high manganese steel rapidly undergoes work-hardening, and its hardness can be increased to more than twice the initial hardness. Moreover, since the core structure does not undergo phase change, it remains an austenite structure and maintains good toughness. The high hardness of the surface ensures the wear resistance of the steel when wear occurs, and the high toughness of the core prevents the generation of cracks during the wear process. While the work-hardening layer on the surface is constantly wearing, the core is also constantly undergoing work-hardening effects, thus ensuring that the high manganese steel always has a certain thickness of work-hardening layer during the wear process. Due to this characteristic, high manganese steel is widely used in mining machinery, railways, metallurgy, electric power and other fields. However, studies have shown that high manganese steel has poor wear resistance under conditions of low impact loads and small deformations. This is because high manganese steel itself has a low hardness. Under conditions of low impact load and small deformation, the work hardening effect is not obvious, resulting in low surface hardness of the steel. The surface of the steel will be worn away quickly. At this time, the underlying part has not had time to produce obvious work hardening effect and has low hardness. This vicious cycle leads to poor wear resistance of the steel.

[0003] In the prior art, in order to solve this problem, some people have enhanced the wear resistance of high manganese steel by increasing the carbon content. As the carbon content increases, the strength of high manganese steel is indeed improved, but the plasticity of the steel is also reduced. There are also methods to improve the wear resistance of high manganese steel by adding other alloying elements to high manganese steel, such as adding elements such as Ti, W, and V to high manganese steel. These elements can form some carbides in the steel and increase the hardness of the steel. There are also methods to change the properties of high manganese steel by heat treatment, such as by aging high manganese steel to produce a precipitation phase in the austenite phase of the steel, and to improve the strength of the steel by precipitation strengthening. The above methods or technologies do improve the strength of steel, but they all sacrifice part of the plasticity of steel, which improves the wear resistance of high manganese steel under low impact load conditions, but reduces the wear resistance of high manganese steel under high impact loads, destroying the original excellent performance of high manganese steel. Moreover, these technologies are all for strengthening the high manganese steel as a whole, and the cost is relatively high when applied on a large scale. Therefore, how to improve the wear resistance of steel under low impact load and small deformation conditions without affecting the wear resistance of high manganese steel under high impact loads is the focus of current research. Summary of the invention

[0004] Based on this, the purpose of the present invention is to propose an iron-based coating for the surface of high manganese steel and a preparation method thereof, so as to solve the technical problem in the prior art that high manganese steel has poor wear resistance under conditions of low impact load and small deformation.

[0005] On the one hand, the present invention provides a method for preparing an iron-based coating on the surface of high manganese steel, the preparation method comprising:

[0006] Obtain a high manganese steel substrate, and pretreat the surface of the high manganese steel substrate so that the surface of the high manganese steel substrate is free of oxide layer, scratches and stains;

[0007] Weighing a certain amount of iron-based powder, and ball-milling the iron-based powder to obtain an iron-based powder with a particle size of 200-300 mesh;

[0008] Place the pretreated high manganese steel substrate horizontally on the workbench of the plasma cladding machine, then put the ball-milled iron-based powder into the powder barrel of the plasma cladding equipment, set the cladding process parameters of the plasma cladding equipment, and control the synchronous feeding of iron-based powder during the cladding process under argon atmosphere to obtain the iron-based coating after cladding is completed.

[0009] Further, in the step of placing the pretreated high manganese steel substrate horizontally on the workbench of the plasma cladding machine, then putting the ball-milled iron-based powder into the powder barrel of the plasma cladding equipment, setting the cladding process parameters of the plasma cladding equipment, and controlling the cladding process to synchronously feed the iron-based powder under an argon atmosphere, and obtaining the iron-based coating after the cladding is completed:

[0010] The cladding process parameters include: welding gun height of 9-12 mm, powder feeding gas flow of 2-3 L / min, ion gas flow of 2-3 L / min, shielding gas flow of 4-6 L / min, cladding speed of 2.5-3 mm / s, weld spacing of 2-2.5 mm, and cladding current of 80 A-100 A.

[0011] Furthermore, the welding gun height is 10 mm, the powder feeding gas flow rate is 2.5 L / min, the ion gas flow rate is 2.5 L / min, the shielding gas flow rate is 5 L / min, the welding speed is 3 mm / s, the weld spacing is 2.5 mm, and the cladding current is 95A.

[0012] Furthermore, after the step of obtaining a high manganese steel substrate and pretreating the surface of the high manganese steel substrate so that the surface of the high manganese steel substrate is free of oxide layer, scratches and stains, the step further includes:

[0013] The pretreated high manganese steel substrate plate was placed in a vacuum drying oven for drying at a drying temperature of 100°C and a drying time of 1 h.

[0014] Furthermore, after the step of weighing a plurality of iron-based powders and ball-milling the iron-based powders to obtain iron-based powders with a particle size of 200-300 meshes, the step further includes:

[0015] The ball-milled iron-based powder was placed in a vacuum drying oven for drying at a drying temperature of 100°C and a drying time of 1 h.

[0016] On the other hand, the present application also proposes an iron-based coating for the surface of high manganese steel, which is obtained by the above-mentioned method for preparing the iron-based coating for the surface of high manganese steel.

[0017] Furthermore, the following components are included by mass percentage: 78-84% iron, 16-18% chromium, 0-1% silicon, 0-1% nickel, and 0.15-0.3% carbon.

[0018] Furthermore, the following components are included in percentage by mass: 0.15% carbon, 18% chromium, 1% silicon, 1% nickel, and the remainder iron.

[0019] Compared with the prior art, this application has the following advantages:

[0020] 1. This application adopts plasma cladding technology and sets the optimal cladding process parameters based on the combination of theoretical and experimental results, so that the phase structure of the coating undergoes a transformation from FCC to BCC.

[0021] 2. The iron-based coating prepared in the present application for the surface of high manganese steel has few defects, and almost no holes or element segregation can be seen under a light microscope.

[0022] 3. The iron-based coating for the surface of high manganese steel produced by the method of the present application has been tested for performance. Compared with the high manganese steel substrate, the hardness is increased by 2 to 3 times, the friction and wear performance is significantly improved, and the wear resistance of the high manganese steel substrate under low impact load is effectively enhanced.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description or will be learned through embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a flow chart of a method for preparing an iron-based coating on a surface of high manganese steel in a first embodiment of the present invention;

[0025] Figure 2 SEM image of the Fe-based powder after ball milling in the first embodiment of the present invention;

[0026] Figure 3 This is a microstructure diagram of the Fe-based coating used on the surface of high manganese steel in the first embodiment of the present invention;

[0027] Figure 4 This is a cross-sectional hardness diagram of the Fe-based coating used on the surface of high manganese steel in the first embodiment of the present invention;

[0028] Figure 5 The XRD diagram of the Fe-based coating used on the surface of high manganese steel in the first embodiment of the present invention;

[0029] Figure 6 It is a friction coefficient curve diagram of the coating and the high manganese steel substrate in the first embodiment of the present invention;

[0030] Figure 7 This is a surface morphology diagram of the coating and the high manganese steel substrate after wear test in the first embodiment of the present invention;

[0031] Figure 8 is a microstructure diagram of the coating in the first embodiment of the present invention;

[0032] Fig. 9 It is a statistical diagram of grain sizes of the second embodiment of the present invention and the first embodiment of the present invention;

[0033] Fig.10 is a cross-sectional hardness diagram of the coating of the second embodiment of the present invention;

[0034] Fig.11 is the XRD diagram of the coating of the second embodiment of the present invention;

[0035] Fig.12 This is a surface morphology diagram of the coating after wear test of the second embodiment of the present invention;

[0036] Fig.13 This is the surface morphology of the coating of the first comparative example after the wear test.

[0037] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0040] Embodiment 1

[0041] See also Figure 1 , which is a flow chart of a method for preparing an iron-based coating on a surface of high manganese steel in a first embodiment of the present invention, the preparation method comprises steps S01 to S03, wherein:

[0042] Step S01: obtaining a high manganese steel substrate, and pretreating the surface of the high manganese steel substrate so that the surface of the high manganese steel substrate is free of oxide layer, scratches and stains;

[0043] It should be pointed out that in order to ensure the cladding effect, the surface of the high manganese steel substrate needs to be pretreated to ensure that the substrate plate is smooth and flat and has no obvious defects.

[0044] In addition, in this embodiment, after the high manganese steel is pretreated, the pretreated high manganese steel substrate plate is placed in a vacuum drying oven for drying at a drying temperature of 100° C. for 1 hour.

[0045] In addition, the high manganese steel matrix and iron-based powder of this embodiment are both conventional raw materials that can be obtained through external purchase.

[0046] Step S02: weighing a certain amount of iron-based powder, and ball-milling the iron-based powder to obtain an iron-based powder with a particle size of 200-300 meshes;

[0047] In this step, the Fe-based powder is ball-milled to keep the particle size of the powder basically uniform, and then the powder is placed in a vacuum drying oven at 100°C for 1 hour. Figure 2 , shown is the SEM image of the Fe-based powder after ball milling. Figure 2 It can be seen that the Fe-based powder after ball milling is spherical, indicating that the fluidity of the Fe-based powder is better.

[0048] In addition, after the ball milling is completed, the ball-milled iron-based powder is placed in a vacuum drying oven for drying at a drying temperature of 100° C. and a drying time of 1 hour.

[0049] It should also be pointed out that during plasma cladding, when the material particle size is too large, the large-particle material requires higher energy to be completely melted, which may lead to uneven composition of the cladding layer, and some particles fail to fully integrate into the matrix, forming defects such as unfused or slag inclusions, and also cause adverse effects such as rough cladding layer and increased spatter. However, when the material particle size is too small, the small-particle material may reduce its fluidity under the action of the plasma arc due to its large surface area and fast heat dissipation, making it difficult to form a uniform cladding layer on the substrate. At the same time, the small-particle material is more likely to contact with oxygen in the air and undergo oxidation reaction, which may lead to an increase in the oxygen content in the cladding layer, affecting the chemical composition and performance of the cladding layer. After multiple adjustments to the process parameters and combining the characteristics of the plasma cladding technology, the powder particle size used in the first embodiment of the present application is 200 to 300 meshes.

[0050] Step S03: Place the pretreated high manganese steel substrate horizontally on the workbench of the plasma cladding machine, then put the ball-milled iron-based powder into the powder barrel of the plasma cladding equipment, set the cladding process parameters of the plasma cladding equipment, and control the cladding process to synchronously feed the iron-based powder under argon atmosphere, and obtain the iron-based coating after cladding is completed.

[0051] It should be noted that, in some embodiments, the cladding process parameters include: welding gun height of 9-12 mm, powder feeding gas flow rate of 2-3 L / min, ion gas flow rate of 2-3 L / min, shielding gas flow rate of 4-6 L / min, cladding speed of 2.5-3 mm / s, weld spacing of 2-2.5 mm, and cladding current of 80 A-100 A.

[0052] In this embodiment, the cladding process parameters are as follows: welding gun height 10 mm, powder feeding gas flow rate 2.5 L / min, ion gas flow rate 2.5 L / min, shielding gas flow rate 5 L / min, welding speed 3 mm / s, weld spacing 2.5 mm, and cladding current 95 A.

[0053] In addition, regarding the workbench of the plasma cladding machine used in this embodiment, its manufacturer is Shanghai Duomu Industrial Co., Ltd. and its model is DML-VO3AD.

[0054] After testing, the iron-based coating for the surface of high manganese steel obtained in this embodiment includes the following components by mass percentage: 0.15% carbon, 18% chromium, 1% silicon, 1% nickel, and the rest is iron.

[0055] In order to further illustrate the performance of the Fe-based coating for the surface of high manganese steel obtained in the first embodiment of the present invention, the present invention conducted a number of tests. First, the Fe-based wear-resistant coating for the surface of high manganese steel in this embodiment was subjected to a metallographic test: the coating surface was selected, the surface was polished smooth with sandpaper, then polished with a polishing machine, etched with 4% nitric acid alcohol until grains appeared, and finally observed and photographed with a metallographic microscope. Metallographic microscope (OM) model: Axio Scope A1.

[0056] See also Figure 3 , which is a microstructure diagram of the Fe-based coating used on the surface of high manganese steel in this embodiment. Figure 3 It can be seen that the obtained coating has a uniform structure and is almost free of defects such as pores or segregation, which indicates that the method for obtaining the Fe-based coating for the surface of high manganese steel in the first embodiment of the present invention is reasonable.

[0057] Due to the high temperature during the cladding process, the base plate melts, and then a metallurgical reaction occurs to form a molten pool on the surface of the base plate. In general, when multiple metal elements undergo metallurgical reactions, brittle intermetallic compounds will react at the interface, causing the hardness of the material to increase at this point. At the same time, due to the inconsistency of the thermal expansion coefficient of the interface structure and the parent material in contact with it, during the cooling process, cracks may also appear in the material at this point. For this reason, a microhardness test is performed on the Fe-based wear-resistant coating used on the surface of high manganese steel in this embodiment: the coating section (including the substrate) is selected, the sample surface is polished smooth with sandpaper, and then polished with a polishing machine, and the cross-section hardness is measured with a micro-Vickers hardness machine, starting from the coating surface to the substrate, and the hardness is measured every 0.1mm. Micro-Vickers hardness tester model: HXS-1000.

[0058] See also Figure 4 , which is a cross-sectional hardness diagram of the Fe-based coating used on the surface of high manganese steel in this embodiment. It can be seen from the figure that the interface area between the coating and the substrate is narrow, indicating a fast cooling rate. At the same time, the hardness at the interface is between the substrate plate (210.5HV) and the coating (456.3HV), which plays a good transition role.

[0059] In addition, the present application also performs XRD detection on the Fe-based coating used on the surface of high manganese steel in this embodiment: the coating surface is selected, the surface is polished smooth with sandpaper, then polished with a polishing machine, and detected with an X-ray instrument. X-ray diffraction (XRD) model: PANalytical-Empyrean.

[0060] See also Figure 5, which is the XRD diagram of the Fe-based coating used on the surface of high manganese steel in this embodiment. Peak searching with jade software revealed that the phase of the coating in the first embodiment of the present invention is mainly γ-Fe, and γ-iron is a typical face-centered cubic metal, indicating good plasticity.

[0061] In addition, the coating and the high manganese steel substrate in the first embodiment of the present invention were subjected to room temperature friction and wear experiments: the coating and the substrate were respectively selected for testing using a friction and wear tester, with a load of 2000 g, a time of 30 min, a frequency of 40 Hz, and a speed of 2240 r / min. The friction and wear instrument model was HT-1000; the wear sample obtained from the wear test was observed using a scanning electron microscope (SEM), and the scanning electron microscope (SEM) model was Quanta 200FEG.

[0062] See also Figure 6 , which is a friction coefficient curve of the coating and the high manganese steel substrate in this embodiment. Figure 6 It can be seen that compared with the high manganese steel substrate, the friction coefficient of the coating in the first embodiment of the present invention is smaller, and the fluctuation of the friction coefficient curve is smaller. This shows that the friction force of the coating during the wear process is smaller, and its wear process is more stable. After calculating the data, it is found that the wear rate of the coating and the high manganese steel substrate is 9.6×10 -6 mm 3 / (N·m), which is less than the wear rate of high manganese steel substrate 1.4×10 -5 mm 3 / (N·m).

[0063] See also Figure 7 , which is the surface morphology of the coating and the high manganese steel substrate after the wear test in this embodiment. Figure 7 It can be seen that there are many grooves on the wear surface of the coating, which is a characteristic of abrasive wear. There are also traces of peeling and protrusions in a small number of places, which are places where a small amount of adhesive wear has occurred. Overall, the wear type of the coating is mainly abrasive wear, accompanied by slight adhesive wear. From the wear morphology of the substrate, it can be seen that there are large pieces of peeling and protrusions on the wear surface, and there are also obvious grooves caused by abrasive wear. The wear surface of the high manganese steel substrate is relatively rough, while the wear surface of the coating is relatively smooth, which also shows that compared with the high manganese steel substrate, the coating has less wear and is more wear-resistant.

[0064] In summary, the above-mentioned preparation method of the iron-based coating on the surface of high manganese steel has the advantages of mature technology and fast cooling speed. By rationally designing the types of elements and the atomic molar ratio between the elements, combining plasma cladding technology and controlling the corresponding cladding process parameters, the prepared coating has the following characteristics:

[0065] 1. First, due to the fast cooling speed after cladding, the metallurgical reaction area of ​​the interface is narrow, the heat distribution during the reaction is more concentrated, the heat affected zone during the reaction is reduced, and it helps to maintain the performance of the parent materials on both sides. At the same time, the small area of ​​the molten pool is conducive to reducing the sensitivity of hot cracks and cold cracks at the interface, and improving the mechanical properties and fatigue resistance at the interface. The small interface area also helps to reduce defects such as pores and slag inclusions during the reaction process. Due to the concentrated heat, the gas and impurities in the interface are more easily discharged, reducing the incidence of defects.

[0066] 2. Secondly, after cladding, the hardness test shows that the hardness of the coating is about twice that of the base plate. At the same time, in the interface bonding area, the hardness is between the coating and the base plate. This hardness distribution is conducive to controlling the stress distribution of the material after bonding. During the metallurgical reaction process, due to temperature changes and material phase changes, residual stress may be generated between the metallurgical reaction interface and the parent materials on both sides. When the hardness of the metallurgical interface is between the parent materials on both sides, the stress distribution is more uniform, which is conducive to reducing stress concentration and avoiding stress corrosion.

[0067] 3. Finally, from Figure 6 The friction coefficient curve data shows that the friction coefficient of the coating is less than that of the substrate, which proves the protective effect of the coating on the wear resistance of the substrate. Figure 7 From the surface morphology of the coating and the high manganese steel substrate after the wear test, it can be seen that the coating surface after the friction test is obviously less worn than the high manganese steel substrate surface, especially in terms of adhesive wear.

[0068] Embodiment 2

[0069] In order to better illustrate the advantages of the present invention, in addition to the above-mentioned first embodiment, the present application also provides another implementation method, namely the second embodiment. The second embodiment of the present invention is basically the same as the first embodiment, except that the cladding current is controlled at 80A.

[0070] See also Figure 8 , which is a microstructure diagram of the coating of the second embodiment of the present invention, Figure 8 It can also be clearly seen that the coating has no defects such as pores or segregation. Fig. 9 It can be seen from the grain size statistics that the grains in the second embodiment of the present invention intersect with the grains in the first embodiment and are larger in size. Fig.10 From the cross-sectional hardness diagram of the coating of the second embodiment of the present invention, it can be concluded that the coating hardness of the second embodiment (719.6HV) is higher than the coating hardness of the first embodiment (456.3HV), and is even about 3 times the hardness of the substrate. Generally speaking, the finer the grain size, the higher the hardness, but the grains of the coating in the second embodiment of the present invention are larger than those in the first embodiment, and the hardness is higher. Fig.11From the XRD diagram of the coating of the second embodiment of the present invention, it can be seen that the coating of the second embodiment of the present invention is α-Fe, which has a BCC crystal structure. Compared with the FCC crystal structure of the first embodiment of the present invention, the strength and hardness will be higher. Fig.12 It can be seen from the surface morphology of the coating after the wear test of the second embodiment of the present invention that due to its higher hardness, compared with the first embodiment of the present invention, the adhesive wear and abrasive wear are lighter and the wear resistance is better.

[0071] In summary, this embodiment uses a smaller current density, but causes the phase of the coating to transform from γ-Fe to α-Fe. Although the grains are larger than those in the first embodiment, their hardness is higher. It can be seen from the surface morphology after the wear test that the second embodiment of the present invention has better wear resistance.

[0072] Comparative Example 1

[0073] The technical solution of this comparative example is basically the same as that of the first embodiment, the only difference being that the high manganese steel substrate is replaced with Q235 steel.

[0074] See also Fig.13 , is the surface morphology of the coating obtained by this comparative example after the wear test. Compared with Example 1, the wear is more serious. At the same time, the wear rate of the comparative example coating is calculated to be 1.12401E-05mm 3 / (N·m), the wear resistance is lower than that of the coating with high manganese steel as the substrate in Example 1. In addition, the surface hardness of the coating of Comparative Example 1 is 355.6HV, which is also lower than the hardness of Example 1. In other words, different steel substrates have a huge impact on the preparation of coatings. The purpose of this application is to prepare an iron-based coating specifically suitable for the surface of high manganese steel.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing an iron-based coating on a high manganese steel surface, characterized in that: The preparation method comprises: Obtain a high manganese steel substrate, and pretreat the surface of the high manganese steel substrate so that the surface of the high manganese steel substrate is free of oxide layer, scratches and stains; Weighing a certain amount of iron-based powder, and ball-milling the iron-based powder to obtain an iron-based powder with a particle size of 200-300 meshes; Place the pretreated high manganese steel substrate horizontally on the workbench of the plasma cladding machine, then put the ball-milled iron-based powder into the powder barrel of the plasma cladding equipment, set the cladding process parameters of the plasma cladding equipment, and control the synchronous feeding of the iron-based powder during the cladding process under argon atmosphere, and obtain the iron-based coating after the cladding is completed; The cladding process parameters include: welding gun height of 10 mm, powder feeding gas flow rate of 2.5 L / min, ion gas flow rate of 2.5 L / min, shielding gas flow rate of 5 L / min, cladding speed of 3 mm / s, weld spacing of 2.5 mm, and cladding current of 80 A; The phase of the iron-based coating is an α-Fe phase, and the crystal structure of the iron-based coating is a BCC crystal structure; The iron-based coating comprises the following components by mass percentage: 0.15% carbon, 18% chromium, 1% silicon, 1% nickel, and the remainder iron.

2. The method for preparing an iron-based coating on a high manganese steel surface according to claim 1, characterized in that: The step of obtaining a high manganese steel substrate and pretreating the surface of the high manganese steel substrate so that the surface of the high manganese steel substrate is free of oxide layer, scratches and stains also includes: The pretreated high manganese steel substrate plate was placed in a vacuum drying oven for drying at a drying temperature of 100°C and a drying time of 1 h.

3. The method for preparing an iron-based coating on a high manganese steel surface according to claim 1, characterized in that: After the step of weighing a plurality of iron-based powders and ball-milling the iron-based powders to obtain iron-based powders with a particle size of 200-300 meshes, the method further comprises: The ball-milled iron-based powder was placed in a vacuum drying oven for drying at a drying temperature of 100°C and a drying time of 1 h.

4. An iron-based coating for high manganese steel surface obtained according to the preparation method according to any one of claims 1 to 3.

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