CN110103530B - High-performance corrosion-resistant TWIP/stainless steel multilayer composite material and preparation method thereof - Google Patents

Abstract

The invention relates to a high-performance corrosion-resistant TWIP/stainless steel multi-layer composite material and a preparation method thereof, comprising multi-layer TWIP steel material layers and multi-layer stainless steel material layers, and multi-layer TWIP steel material layers and multi-layer stainless steel material layers are alternately stacked and rolled Together, and the surface layer of the composite material is all stainless steel layers, the thickness of each layer of material in the multi-layer composite material is not more than 0.05mm, and the number of layers of the TWIP steel material layer is 1 less than the number of layers of the stainless steel material layer. According to the requirements for the mechanical properties of the material, the method performs subsequent heat treatment or cold rolling, annealing treatment and other technological adjustments, so as to obtain a TWIP/stainless steel multilayer composite steel with high yield strength and high strength and plastic product. The composite material is composed of thinner stainless steel and TWIP steel plates laminated in multiple layers, which can not only give full play to the advantages of TWIP steel, but also ensure the corrosion resistance and strength requirements of the material.

Description

A kind of high-performance corrosion-resistant TWIP/stainless steel multi-layer composite material and preparation method

technical field

The invention designs the field of metal rolling, and prepares a metal composite material with high interface bonding strength, high strength, high toughness and high corrosion resistance.

Background technique

With the progress of the national economy and society, people have higher and higher requirements for the performance of materials. Traditional metal materials have the disadvantages of higher strength, lower toughness, or lower toughness, higher strength. People have discovered a new material TWIP steel. TWIP steel has the characteristics of high specific strength and high toughness, and has wide application prospects. However, TWIP steel has obvious shortcomings of delayed fracture and poor corrosion resistance, which limits the industrial research and application of TWIP steel. While strengthening metal materials, it will lead to a decrease in plasticity and toughness, resulting in an inversion of strength and toughness (plasticity), which restricts the further strengthening and toughening of metal materials and industrial applications. CN 107309285 A discloses a composite material made by rolling TWIP steel, IF steel and low-carbon steel. Under relatively large stress, the amount of deformation produced by the different materials on the upper and lower sides of TWIP steel will also be different, resulting in The stresses are different. At the same time, the thickness of each layer of raw material is 20mm. Even if the 3mm material is formed after a large reduction, the deformation is mainly three kinds of materials, and the large energy loss is not conducive to the contact between the two interfaces. Combined, uneven deformation.

Contents of the invention

In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a high-performance corrosion-resistant TWIP/stainless steel multilayer composite material, which is composed of multilayer laminated thin stainless steel and TWIP steel plates, both It can give full play to the advantages of TWIP steel and ensure the corrosion resistance and strength requirements of the material. According to the requirements for the mechanical properties of the material, the method performs subsequent heat treatment or cold rolling, annealing treatment and other technological adjustments, so as to obtain a TWIP/stainless steel multilayer composite steel with high yield strength and high strength and plastic product.

Technical scheme of the present invention is:

A high-performance corrosion-resistant TWIP/stainless steel multi-layer composite material, including multi-layer TWIP steel material layers and multi-layer stainless steel material layers, multi-layer TWIP steel material layers and multi-layer stainless steel material layers are alternately stacked and rolled together, and the composite material The surface layers of the composite materials are all stainless steel layers, the thickness of each layer in the multi-layer composite material is not more than 0.05mm, and the number of layers of the TWIP steel material layer is 1 less than that of the stainless steel material layer.

The layer thickness ratio of the TWIP steel material layer and the stainless steel material layer is 1:0.5-2.

A method for preparing the above-mentioned composite material is characterized in that, by cutting and laminating the stainless steel and TWIP steel material plates, it is necessary to ensure that the stainless steel plate is positioned at the surface layer of the billet during the lamination process, and then surround the laminated TWIP/TWIP with four seals. The stainless steel material forms a groove, and the upper and lower ends are sealed with a cover to form a box body, which is welded by argon arc welding to obtain a sealed billet, sealed and then vacuumed, heated and kept warm in the furnace at high temperature, and then hot-rolled Multi-pass hot rolling is carried out on the machine to ensure that the total rolling reduction is 90%.

After the hot rolling, the heat treatment process is continued, and the heat treatment process includes heat preservation and quenching or annealing treatment, cold rolling and annealing treatment.

Described preparation method comprises the following steps:

The first step, pretreatment: take 0.3-2mm thick stainless steel sheet and TWIP steel sheet of equal size, put them into 95% alcohol for ultrasonic cleaning, then dry and polish until the oxide layer is removed and the metallic luster is exposed;

The second step is to seal the billet: stack the stainless steel sheet and the TWIP steel sheet at intervals. During the lamination process, ensure that the stainless steel plate is located on the surface of the billet, and use four seals around it to laminate the TWIP/stainless steel sheet by argon arc welding. The material is fixed; the distance between the TWIP/stainless steel laminated material and the adjacent seal is 2-4mm, and the height of the laminated material plus the height of the high-temperature isolation cloth is equal to the thickness of the seal;

Place the same size isolation at both ends of the laminate, then place two steel plates on the upper and lower ends of the seal, and use argon arc welding to weld and seal the steel plate and the seal;

The third step, vacuuming: Drill a through hole between one of the seals in the sealed billet, weld the stainless steel tube on the through hole, and check through the leak detection equipment to ensure that the welding package is intact, and then use a mechanical pump , magnetic pump and molecular pump three-stage vacuum equipment to vacuumize the air in the hole and keep the vacuum degree at 10 ^-4 Pa. Heat the stainless steel tube to 500-1000 °C with an oxygen arc welding torch, and seal the stainless steel tube with hydraulic pliers. , and finally seal the stainless steel tube with vacuum mud;

The fourth step, hot rolling: Put the vacuum-pumped billets into a high-temperature heating furnace to raise the temperature, raise it to 1000-1200°C for heat preservation treatment, and keep the heat for 1-3 hours; use a crane to send the heated billets into the heating furnace Carry out hot rolling in the rolling mill to ensure that the total rolling reduction is 90%, and each rolling reduction is 20-30%, and cool to room temperature;

The fifth step, cold rolling: After hot rolling, use a crane to send the material into the cold rolling mill for cold rolling. The thickness of the material after cold rolling is 1/3 of the thickness of the hot rolled material;

The sixth step, annealing: the material is kept at 500°C-800°C for 5-7 minutes, and then air-cooled to room temperature.

In the first step, the material thickness of each layer of the stainless steel sheet and the TWIP steel sheet is less than 1mm.

In the material heat preservation and quenching treatment, the heat preservation temperature is 1000-1100 ℃, and the heat preservation time is 6-30 minutes; for heat preservation and annealing treatment, the heat preservation temperature is 500-800 ℃, and the heat preservation time is 0.5-3 hours.

Compared with prior art, the beneficial effect of the present invention is:

The outstanding substantive features of the present invention are:

In the present invention, the layered TWIP/stainless steel composite material is prepared by high-temperature hot rolling. In the billet assembly process, the upper and lower surfaces are stainless steel layers to play a corrosion-resistant role. In the hot rolling process, due to the large amount of plastic deformation and high hot rolling temperature, the bonding strength of the material interface will be greatly improved, and at the same time, it will undergo a serious recovery and recrystallization process, which will refine the grains, thereby improving the quality of the material. On the other hand, the thickness of each layer of material can reach the micron level after hot rolling, so as to achieve the purpose of uniform structure. During the cold rolling process, the strength of the material is improved due to the effect of work hardening, and the elongation after fracture of the material is also greatly reduced. Therefore, the subsequent annealing treatment will eliminate the interface oxide and residual stress, and improve the strength and toughness of the metal material to a certain extent by generating fine grains and strong texture.

Significant progress of the present invention is:

The composite material of the present invention adopts TWIP steel with low yield strength, high strength and toughness and stainless steel plate with high yield strength and high corrosion resistance, and obtains a material with strong interface bonding and each layer of material can reach the micron level through lamination and vacuum hot rolling. TWIP/stainless steel multilayer composite steel can be regulated by subsequent cold rolling and heat treatment processes according to different requirements on the mechanical properties of the material. Through multilayer structure toughening, TWIP (strain-induced twinning)/TRIP (strain-induced Change) synergistic deformation mode, large plastic deformation enhancement and coating corrosion resistance, to obtain a multi-layer composite steel plate with higher yield strength, elongation and high corrosion resistance.

The preparation method of the present invention uses vacuum hot rolling to improve the interface bonding strength of the material and the interface contains very little oxide, so that the two materials are better combined. On the other hand, the multi-layer material undergoes a large deformation, so that each layer The thickness of the layer can reach the micron level, which makes the organization of the material more uniform, improves the deformation coordination ability of the material and then improves the mechanical properties of the material. Then cold rolling can be carried out to improve the tensile strength of the material through deformation strengthening, and at the same time, the interfacial bonding strength between the material layers will be hardened with deformation to improve the interfacial bonding strength of the material, and then annealing treatment is carried out, and annealing is performed below the recrystallization temperature to ease the processing of the material Hardening thereby increasing the elongation of the material. Stainless steel has good corrosion resistance and high-strength mechanical properties. Stainless steel can make up for the lack of TWIP steel in terms of performance. The method of vacuum hot rolling can effectively combine the comprehensive properties of stainless steel with the high toughness of TWIP steel, thereby improving Mechanical properties of TWIP steel. In this invention, the strength of the material is 700MPa-1600MPa, and the elongation is 10%-60%. The preparation process can be adjusted according to actual needs, which has a wide range of applications. The preparation process is simple, green and pollution-free, in line with national advocacy energy-saving and emission-reduction policies.

The specific advantages of the method are as follows: a) placing the billet in a heating furnace for 1-3 hours can ensure that the material is completely transformed into austenite structure and the grain size will not grow. In this way, the two materials are uniformly deformed in the subsequent rolling process to reduce the stress concentration at the interface of the two materials. b) Compared with the previous patents, the thickness of the two raw materials in the present invention is selected and controlled at about 1mm, which can ensure that the interface of the two materials is more stable and the structure is more uniform after hot rolling with a large amount of deformation. c) During the hot rolling process, each reduction is controlled at 20% to 30%, and each reduction can make the material deform uniformly. d) After cold rolling, the material is annealed, and the holding time is controlled at 5-7 minutes. A longer holding time can ensure that the internal stress of the material after cold rolling is completely eliminated. f) The method of this application can also be quenched after the hot rolling treatment.

The method of the invention has the advantages of simple preparation process, short production cycle, green pollution, moderate adjustment of size and thickness, and is suitable for industrialized production.

Description of drawings

Figure 1 is a schematic diagram of symmetrical vacuum packaging of hot-rolled 304/TWIP composite plates, in which: 1—steel plate, 2—seal, 3—high temperature insulation cloth, 4—stainless steel tube, 5—SUS304 stainless steel sheet, 6—TWIP steel sheet.

Detailed ways

The present invention is further explained below in conjunction with the examples, but it is not used as a limitation to the protection scope of the present application.

The high-performance corrosion-resistant TWIP/stainless steel multilayer composite material of the present invention includes multilayer TWIP steel material layers and multilayer stainless steel material layers, and the multilayer TWIP steel material layers and multilayer stainless steel material layers are alternately stacked and rolled together, and the composite material The surface layer is all stainless steel layer, the number of layers of TWIP steel material layer and stainless steel material layer is not less than ten layers, the thickness of each layer of material in the multi-layer composite material is not more than 0.05mm, the thickness of the multi-layer composite material and the thickness of the raw material It is related to the number of layers, the number of layers of TWIP steel material layer is 1 less than the number of layers of stainless steel material layer.

The layer thickness ratio of the above-mentioned TWIP steel material layer and the stainless steel material layer is 1:0.5-2, and the layer thickness ratio can be adjusted according to actual needs.

The preparation method of the above materials is as follows: by cutting stainless steel and TWIP steel plates and laminating them in multiple layers, during the lamination process, it is necessary to ensure that the stainless steel plates are located on the surface of the billet, so as to ensure the corrosion resistance of the material, and then use four seals to surround the lamination. The TWIP/stainless steel material forms a groove, and the upper and lower ends are sealed with a cover to form a box body, which is welded by argon arc welding to obtain a sealed billet, sealed and then vacuumed, through high temperature heating and heat preservation in the furnace. Multi-pass hot rolling is carried out on the hot rolling mill to ensure that the total rolling reduction is 90%.

After hot rolling, the heat treatment process (heat preservation and quenching or annealing treatment, cold rolling and annealing treatment) can be continued to obtain better interlayer interface bonding and micron-level layer thickness scale to achieve the purpose of strengthening and toughening the layered composite material.

The above method comprises the following steps:

The first step, pretreatment: take 0.3-2mm thick stainless steel sheet and TWIP steel sheet of equal size, put them into 95% alcohol for ultrasonic cleaning, then dry and polish until the oxide layer is removed and the metallic luster is exposed;

The second step is to seal the billet: stack the stainless steel sheet and the TWIP steel sheet at intervals. During the stacking process, ensure that the stainless steel plate is located on the surface of the billet, so as to ensure the corrosion resistance of the material. Four seals are used around it. Argon arc welding fixes the TWIP/stainless steel laminated material; the distance between the TWIP/stainless steel laminated material and the adjacent seal is 2-4mm, and the height of the laminated material plus the height of the high-temperature isolation cloth is equal to the thickness of the seal;

Place the same size isolation at both ends of the laminate, then place two steel plates on the upper and lower ends of the seal, and use argon arc welding to weld and seal the steel plate and the seal;

The shape of the steel plate depends on the size of the stainless steel sealing strip, and the thickness depends on the stacking height. The higher the stacking height, the larger the thickness of the steel plate, and vice versa.

The third step, vacuuming: Drill a through hole with a diameter of 6mm between one of the sealed billets, weld the stainless steel tube on the small hole, and check through the leak detection equipment to ensure that the welded package is intact (inspection The method of leaking is to place the assembly in water to inflate and pressurize the stainless steel tube to see if there are bubbles) and then use a vacuum device including a mechanical pump, a magnetic pump and a molecular pump to vacuum the air in the hole to keep Heat the stainless steel tube to 500-1000°C with an oxygen arc welding torch at a vacuum degree of 10 ^-4 pa, seal the stainless steel tube with hydraulic pliers, and finally seal the stainless steel tube with vacuum mud;

Among them, the outer diameter of the stainless steel pipe is 8-10mm, and the inner diameter is 6-8mm;

The fourth step, hot rolling: Put the vacuum-pumped billets into a high-temperature heating furnace to raise the temperature, raise it to 1000-1200°C for heat preservation treatment, and keep the heat for 1-3 hours; use a crane to send the heated billets into the heating furnace Carry out hot rolling in the rolling mill to ensure that the total rolling reduction is 90%, and each rolling reduction is 20-30%, and cool to room temperature;

The fifth step, cold rolling: After hot rolling, use a crane to send the material into the cold rolling mill for cold rolling. The thickness of the material after cold rolling is 1/3 of the thickness of the hot rolled material;

The sixth step, annealing: the material is kept at 500°C-800°C for 5-7 minutes, and then air-cooled to room temperature.

In the first step of the above preparation method, the material thickness of each layer of the stainless steel sheet and the TWIP steel sheet is less than 1 mm.

In this application, the selected thickness of each layer of the plate should be as thin as possible to ensure that under large deformation, most of the force acts between the layers to improve the bonding strength. The thinner the raw material, the thinner the thickness of each layer after hot rolling. Microcracks need to pass through the interface to consume a lot of energy during the expansion process to achieve the effect of toughening. On the other hand, this helps to control the thickness of each layer of the obtained material at the micron level, which is conducive to improving the deformation coordination ability of the material. The selection of the number of layers can be determined according to the actual required plate thickness, the greater the final plate thickness, the greater the number of layers. For the subsequent cold rolling and annealing process, it is adjusted according to the required mechanical properties. The greater the degree of deformation after cold rolling, the higher the strength, the higher the annealing temperature (below the crystallization temperature), and the higher the toughness of the material.

In the method of the invention, materials are stacked in multiple layers, and the layer thickness of each layer of material can be controlled at micron level through large compression deformation. During the lamination process, ensure that the stainless steel is located on the upper and lower surfaces, thereby ensuring the corrosion resistance of the material. After obtaining the hot-rolled multi-layer composite material, the subsequent heat treatment process and annealing treatment after cold rolling can be flexibly adjusted according to different requirements for mechanical properties.

Example 1:

The stainless steel material used in this embodiment is SUS304 austenitic stainless steel, the total number of stacked layers of TWIP steel and SUS304 stainless steel is 61, and the layer thickness ratio of stainless steel and TWIP steel is 1:1.

The TWIP steel involved in this embodiment is a well-known material widely used in this field. The main components are: Mn: 31.48% Si: 2.83% Al: 2.88% C: 0.0046%. The toughness of TWIP steel is very high, and the elongation rate can reach 83.33%, but the tensile strength is relatively low and can only reach 600MPa. SUS304 austenitic stainless steel is a well-known material widely used in this field. Main components: Cr: 18.5% Ni: 8.5% Mn: 2% Si: 2% P: 0.025% S: 0.001%. It has high strength but low elongation.

The specific preparation process is:

1: Take 31 pieces of SUS304 austenitic stainless steel and 30 pieces of TWIP steel with a thickness of 0.5mm, put them into 95% alcohol for ultrasonic cleaning, then dry and polish until the oxide layer is removed and the metallic luster is exposed.

The dimensions of both materials are 80mm×80mm×0.5mm

2: Stack the SUS304 stainless steel sheet 5 and the TWIP steel sheet 6 at intervals (the upper and lower surfaces are stainless steel layers) and weld four steel seals 2 around by argon arc welding to fix the TWIP/304 laminated material.

The seal size is 120mm×36mm×20mm and 84mm×18mm×35mm and the material is 45 steel

3: Use two steel plates 1 to place at both ends of the laminated material (and use a high-temperature isolation cloth 3 with a size of 80mm×80mm to separate the laminated material from the steel plate), and use argon arc welding to weld the seal and the steel plate to form a A closed rectangular box.

The size of the steel plate is 84mm×84mm×2mm

4: Make a through hole with a diameter of 6mm in the middle of the seal, weld the stainless steel tube 4 with an outer diameter of 10mm and an inner diameter of 6mm to the edge of the through hole, and check it through the leak detection equipment to ensure that the welded package is intact (the leak detection method is Put the billet in water to inflate and pressurize the stainless steel tube to see if there are any bubbles) Then vacuumize the vacuum equipment with mechanical pump, magnetic pump and molecular pump three-stage pump to remove the air in the hole and keep the vacuum degree at 10 ^{- 4} pa heat the stainless steel tube to 800°C with an oxygen arc welding torch, seal the stainless steel tube with hydraulic pliers, and finally seal the stainless steel tube with vacuum mud.

5: Put the assembled billets after vacuuming into a high-temperature heating furnace to raise the temperature to 1100°C for heat preservation treatment for 2 hours. 6: Use a crane to send the heated billets into the hot rolling mill for hot rolling. The rolling passes are 8 times, and the reduction rates of each pass are: 20%, 20%, 21%, 22%, and 23%. , 27%, 32%, 35% rolling total reduction is about 90%, rolling speed is 1m/s. The tensile test of the material shows that the yield strength reaches 242MPa, the tensile strength reaches 722MPa, and the elongation reaches 47.7%.

Example 2:

On the basis of Example 1, the material is subjected to a heat treatment process, and the material is kept at 1050° C. for 6 minutes and then quenched.

The tensile test of the material has yield strength of 253MPa, tensile strength of 824MPa and elongation of 60.5%.

Example 3:

On the basis of Example 1, the material is subjected to a heat treatment process, and the material is kept at 1100° C. for 6 minutes and then quenched.

Tensile test is carried out on the material, the yield strength reaches 214MPa, the tensile strength reaches 824MPa, and the elongation reaches 22.2%.

Example 4:

On the basis of Example 1, the material was subjected to a heat treatment process, and the material was kept at 500° C. for 30 minutes and then air-cooled.

Tensile test was carried out on the material, the yield strength reached 280MPa, the tensile strength reached 857MPa, and the elongation reached 38.89%

Example 5:

On the basis of Example 1, the material is subjected to a heat treatment process, and the material is kept at 600° C. for 30 minutes and then air-cooled.

Tensile test is carried out on the material, the yield strength reaches 326MPa, the tensile strength reaches 906MPa, and the elongation reaches 22%.

Embodiment 6:

On the basis of Example 1, the heat treatment process was performed on the material, and the material was kept at 820° C. for 3 hours and then air-cooled.

Tensile test is carried out on the material, the yield strength reaches 216MPa, the tensile strength reaches 848MPa, and the elongation reaches 27.8%.

Embodiment 7:

On the basis of Example 1, the material is subjected to a heat treatment process, and the material is kept at 1050° C. for 30 minutes and then quenched. Tensile test was carried out on the material, the yield strength reached 232MPa, the tensile strength reached 785MPa, and the elongation reached 30.56%.

Embodiment 8:

On the basis of Example 1, the material is subjected to a heat treatment process, and the material is kept at 1100° C. for 30 minutes and then quenched.

Tensile test was carried out on the material, the yield strength reached 205MPa, the tensile strength reached 714MPa, and the elongation reached 33.33%.

Embodiment 9:

On the basis of Example 1, the material is cold-rolled until the thickness of the material is 1/3 of the original, that is, the thickness of cold rolling is 1 mm; then annealing is performed, and the material is kept at 500° C. for 6 minutes and then air-cooled.

The tensile test of the material has a yield strength of 1606MPa, a tensile strength of 1606MPa, and an elongation of 10.55%.

Example 10:

In this example, on the basis of Example 1, the material is subjected to cold rolling and annealing treatment, cold rolling to 1 mm, temperature controlled below the crystallization temperature at 600° C. for 6 minutes, and finally air-cooled to room temperature.

Tensile test was carried out on the material, the yield strength reached 757MPa, the tensile strength reached 1245MPa, and the elongation reached 11.38%.

Example 11:

The steps of this embodiment are the same as those of Embodiment 10, except that the annealing temperature is 700°C.

The tensile test of the material has a yield strength of 632MPa, a tensile strength of 998MPa, and an elongation of 24.52%.

Example 12:

The steps of this embodiment are the same as those of Embodiment 10, except that the annealing temperature is 800°C.

Tensile test was carried out on the material, the yield strength reached 452MPa, the tensile strength reached 919MPa, and the elongation reached 30.56%.

The performance test result of above-mentioned embodiment sees the following table:

Different heat treatment processes for materials, although the yield strength does not increase significantly, but the tensile strength of the material can be improved to varying degrees, and the annealing treatment of the material after cold rolling can significantly improve the yield strength and tensile strength of the material, according to Different requirements on the mechanical properties of materials can adjust the processing technology of materials. The data in the table shows that the mechanical properties of the material have been changed to varying degrees after being processed by different processes.

After different heat treatment processes, the tensile strength of TWIP steel can be improved to varying degrees. After hot rolling, different heat treatment processes can improve the tensile strength of the material to a limited extent, but it can be greatly improved by cold rolling after hot rolling. The tensile strength of the material can be adjusted according to actual needs.

The above-mentioned embodiments of the present invention are only examples for illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, on the basis of the above description, other changes and changes in different forms can also be made, and all implementation modes cannot be exhaustively listed here. Obvious changes or changes are still within the protection scope of the present invention.

Matters not covered in the present invention are known technologies.

Claims (7)

1. A high-performance corrosion-resistant TWIP/stainless steel multilayer composite material, comprising multilayer TWIP steel material layers and multilayer stainless steel material layers, multilayer TWIP steel material layers and multilayer stainless steel material layers are alternately stacked and rolled together, and The surface layer of the composite material is stainless steel layer, the thickness of each layer of material in the multilayer composite material is not more than 0.05mm, and the number of layers of TWIP steel material layer is 1 less than that of stainless steel material layer. 2. The composite material according to claim 1, characterized in that the layer thickness ratio of the TWIP steel material layer and the stainless steel material layer is 1:0.5-2. 3. a kind of preparation method of composite material described in claim 1 is characterized in that, by stainless steel and TWIP steel material sheet material is carried out cutting multi-layer lamination, in lamination process will guarantee that stainless steel plate is positioned at group blank surface layer, then four The block seal forms a groove around the laminated TWIP/stainless steel material, and the upper and lower ends are sealed with a cover to form a box body, which is welded by argon arc welding to obtain a sealed preform, sealed and then vacuumed, and heated at high temperature in the furnace And heat preservation, multi-pass hot rolling forming on the hot rolling mill to ensure that the total rolling reduction is 90%. 4. The preparation method according to claim 3, wherein the heat treatment process is continued after the hot rolling, and the heat treatment process is heat preservation and quenching or annealing treatment, cold rolling and annealing treatment. 5. preparation method according to claim 4, is characterized in that, the method comprises the following steps: The first step, pretreatment: take 0.3-2mm thick stainless steel sheet and TWIP steel sheet of equal size, put them into 95% alcohol for ultrasonic cleaning, then dry and polish until the oxide layer is removed and the metallic luster is exposed; The second step is to seal the billet: stack the stainless steel sheet and the TWIP steel sheet at intervals. During the lamination process, ensure that the stainless steel plate is located on the surface of the billet, and use four seals around it to laminate the TWIP/stainless steel sheet by argon arc welding. The material is fixed; the distance between the TWIP/stainless steel laminated material and the adjacent seal is 2-4mm, and the height of the laminated material plus the height of the high-temperature isolation cloth is equal to the thickness of the seal; Place the same size isolation at both ends of the laminate, then place two steel plates on the upper and lower ends of the seal, and use argon arc welding to weld and seal the steel plate and the seal; The third step, vacuuming: Drill a through hole between one of the seals in the sealed billet, weld the stainless steel tube on the through hole, and check through the leak detection equipment to ensure that the welding package is intact, and then use a mechanical pump , magnetic pump and molecular pump three-stage vacuum equipment to vacuumize the air in the hole and keep the vacuum degree at 10 ^-4 Pa. Heat the stainless steel tube to 500-1000 °C with an oxygen arc welding torch, and seal the stainless steel tube with hydraulic pliers. , and finally seal the stainless steel tube with vacuum mud; The fourth step, hot rolling: Put the vacuum-pumped billets into a high-temperature heating furnace to raise the temperature, raise it to 1000-1200°C for heat preservation treatment, and keep the heat for 1-3 hours; use a crane to send the heated billets into the heating furnace Carry out hot rolling in the rolling mill to ensure that the total rolling reduction is 90%, and each rolling reduction is 20-30%, and cool to room temperature; The fifth step, cold rolling: After hot rolling, use a crane to send the material into the cold rolling mill for cold rolling. The thickness of the material after cold rolling is 1/3 of the thickness of the hot rolled material; The sixth step, annealing: the material is kept at 500°C-800°C for 5-7 minutes, and then air-cooled to room temperature. 6. The preparation method according to claim 5, characterized in that, in the first step, the material thickness of each layer of the stainless steel sheet and the TWIP steel sheet is below 1 mm. 7. The preparation method according to claim 4, characterized in that, in the heat preservation and quenching treatment of the material, the heat preservation temperature is 1000-1100°C, and the heat preservation time is 6-30min; in the heat preservation and annealing treatment, the heat preservation temperature is 500-800°C , The holding time is 0.5 ~ 3h.

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