CN110103530B - High-performance corrosion-resistant TWIP/stainless steel multilayer composite material and preparation method thereof - Google Patents
High-performance corrosion-resistant TWIP/stainless steel multilayer composite material and preparation method thereof Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- C21D8/0226—Hot rolling
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
The invention relates to a high-performance corrosion-resistant TWIP/stainless steel multilayer composite material and a preparation method thereof, wherein the composite material comprises a plurality of TWIP steel material layers and a plurality of stainless steel material layers, the plurality of TWIP steel material layers and the plurality of stainless steel material layers are alternately laminated and rolled together, the surface layers of the composite material are stainless steel layers, the thickness of each layer of the multilayer composite material is not more than 0.05mm, and the number of TWIP steel material layers is 1 less than that of the stainless steel material layers. The method carries out subsequent process regulation and control such as heat treatment or cold rolling, annealing treatment and the like according to the requirement on the mechanical property of the material, thereby obtaining the TWIP/stainless steel multilayer composite steel with high yield strength and high product of strength and elongation. The composite material is formed by laminating a plurality of layers of thinner stainless steel and TWIP steel plates, not only can exert the advantages of TWIP steel, but also can ensure the corrosion resistance and the strength requirements of the material.
Description
Technical Field
The invention relates to the field of metal rolling, and provides a metal composite material with high interface bonding strength, high toughness and high corrosion resistance.
Background
With the progress of national economy and society, people have higher and higher requirements on the performance of materials, the traditional metal materials have the defects that the higher the strength is, the lower the toughness is or the lower the toughness is, the higher the strength is, and people find a novel material, namely TWIP steel, which has the characteristics of high specific strength and high toughness and has a wide application prospect, but the TWIP steel has the defects of obvious delayed fracture and poor corrosion resistance, so that the industrial research and application of the TWIP steel are limited. When the metal material is strengthened, the plasticity and the toughness of the metal material are reduced, so that the strength and the toughness (plasticity) are inverted, and the further strengthening and industrial application of the metal material are restricted. CN 107309285A discloses a composite material made by rolling TWIP steel, IF steel and mild steel, wherein the deformation amount generated by the difference of materials at the upper and lower sides of TWIP steel is different under a larger stress, so that the stress applied to the two sides of the interface is different, and the thickness of each layer of raw material is 20mm thick, even IF a 3mm material is formed by a larger reduction amount, the main three materials are deformed, so that a larger energy loss is not beneficial to the combination between the two interfaces, and the deformation is not uniform.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide a high-performance corrosion-resistant TWIP/stainless steel multilayer composite material, which is formed by multilayer overlapping of thinner stainless steel and TWIP steel plates, not only can play the advantages of TWIP steel, but also can ensure the corrosion resistance and the strength requirements of the material. The method carries out subsequent process regulation and control such as heat treatment or cold rolling, annealing treatment and the like according to the requirement on the mechanical property of the material, thereby obtaining the TWIP/stainless steel multilayer composite steel with high yield strength and high product of strength and elongation.
The technical scheme of the invention is as follows:
a high-performance corrosion-resistant TWIP/stainless steel multilayer composite material comprises a plurality of TWIP steel material layers and a plurality of stainless steel material layers, wherein the plurality of TWIP steel material layers and the plurality of stainless steel material layers are alternately laminated and rolled together, the surface layers of the composite material are stainless steel layers, the thickness of each layer of the material in the multilayer composite material is not more than 0.05mm, and the number of layers of the TWIP steel material layers is 1 less than that of the stainless steel material layers.
The layer thickness ratio of the TWIP steel material layer to the stainless steel material layer is 1.
A preparation method of the composite material is characterized in that a stainless steel plate and a TWIP steel material plate are cut and laminated in a multi-layer mode, the stainless steel plate is ensured to be positioned on the surface layer of a blank in the laminating process, four sealing strips are used for surrounding the laminated TWIP/stainless steel material to form a groove, the upper end and the lower end of the groove are packaged by using covers to form a box body, argon arc welding is used for welding to obtain a sealed blank, the sealed blank is sealed and then vacuumized, and multi-pass hot rolling forming is carried out on a hot rolling mill through high-temperature heating and heat preservation in a furnace, so that the total rolling reduction is ensured to be 90%.
And (3) continuing to perform a heat treatment process after hot rolling, wherein the heat treatment process comprises heat preservation and quenching or annealing treatment, cold rolling and annealing treatment.
The preparation method comprises the following steps:
the first step, pretreatment: taking a stainless steel sheet and a TWIP steel sheet with the same size and the thickness of 0.3-2 mm, respectively putting the stainless steel sheet and the TWIP steel sheet into 95% alcohol, carrying out ultrasonic cleaning, then drying and polishing until an oxide layer is removed and the metallic luster is exposed;
step two, sealing and assembling: stacking stainless steel sheets and TWIP steel sheets at intervals, ensuring that the stainless steel sheets are positioned on the surface layer of a blank in the stacking process, and fixing the TWIP/stainless steel laminated material at the periphery by four sealing strips through argon arc welding; wherein 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;
placing the same-size isolation cloth at two ends of the lamination, then respectively placing two steel plates at the upper end and the lower end of the seal, and welding and sealing the steel plates and the seal by argon arc welding;
step three, vacuumizing: drilling a through hole between sealing strips in a sealed assembly, welding a stainless steel pipe on the through hole, and checking through leakage checking equipment to ensure that welding and packaging are completeThen, vacuum equipment comprising a mechanical pump, a magnetic pump and a molecular pump is used for vacuumizing to remove air in the holes and keep the vacuum degree at 10 -4 pa heating the stainless steel pipe to 500-1000 ℃ by using an oxygen arc welding gun, sealing the stainless steel pipe by using a hydraulic clamp, and finally sealing the stainless steel pipe by using vacuum mud;
step four, hot rolling: putting the assembly after vacuumizing into a high-temperature heating furnace for heating, raising the temperature to 1000-1200 ℃ for heat preservation treatment, and preserving the heat for 1-3 h; feeding the heated assembly into a hot rolling mill by using a crane for hot rolling, ensuring that the total rolling reduction is 90 percent and the rolling reduction of each time is 20-30 percent, and cooling to room temperature;
step five, cold rolling: after hot rolling, sending the material into a cold rolling mill by a crane for cold rolling, wherein the thickness of the cold rolled material is 1/3 of that of the hot rolled material;
sixth step, annealing: the material is kept at 500-800 ℃ for 5-7min, and then air-cooled to room temperature.
In the first step, the thickness of each layer of the stainless steel sheet and the TWIP steel sheet is less than 1 mm.
During the heat preservation and quenching treatment of the material, the heat preservation temperature is 1000-1100 ℃, and the heat preservation time is 6-30 min; heat preservation and annealing treatment are carried out, the heat preservation temperature is 500-800 ℃, and the heat preservation time is 0.5-3 h.
Compared with the prior art, the invention has the beneficial effects that:
the invention has the prominent substantive characteristics that:
the invention utilizes a high-temperature hot rolling mode to prepare the layered TWIP/stainless steel composite material, and in the assembly process, one layer of stainless steel layer is arranged on the upper surface and the lower surface to play a role in corrosion resistance. In the hot rolling process, the bonding strength of a material interface can be greatly improved due to larger plastic deformation and higher hot rolling temperature, and the material can undergo a serious recovery recrystallization process to play a role in refining grains, so that the toughness of the material is improved, and on the other hand, the thickness of each layer of the material after hot rolling can reach the micron level, and the purpose of uniform structure is realized. In the cold rolling process, the strength of the material is improved due to the work hardening effect, and the post-fracture elongation of the material is greatly reduced. The subsequent annealing treatment will eliminate the interface oxide and residual stress, and raise the strength and toughness of the metal material to some extent through the formation of fine crystal and strong texture.
The invention has the remarkable improvements that:
the composite material adopts TWIP steel with low yield strength and high obdurability and stainless steel plates with higher yield strength and high corrosion resistance, the TWIP/stainless steel multilayer composite steel with stronger interface combination and each layer of material reaching the micron level is obtained by lamination and vacuum hot rolling, the subsequent cold rolling and heat treatment process can be used for regulation and control according to the different requirements on the mechanical properties of the materials, and the multilayer composite steel plate with higher yield strength, elongation and high corrosion resistance is obtained by the synergistic deformation mode of the multilayer structure toughening, the TWIP (strain induced twin crystal)/TRIP (strain induced martensite phase change), the large plastic deformation enhancement and the coating corrosion resistance.
The preparation method of the invention utilizes vacuum hot rolling to improve the interface bonding strength of the material, and the interface contains little oxide, thus leading the two materials to be better combined, on the other hand, the thickness of each layer of the multi-layer material can reach the micron level through larger deformation, leading the organization of the material to be more uniform, improving the deformation coordination capability of the material and further improving the mechanical property of the material. And then cold rolling can be carried out to improve the tensile strength of the material through deformation strengthening, simultaneously the interface bonding strength between material layers generates work hardening along with deformation to improve the interface bonding strength of the material, annealing treatment is carried out, and annealing is carried out below the recrystallization temperature to relieve the work hardening of the material so as to improve the elongation of the material. The stainless steel has good corrosion resistance and high-strength mechanical property, the stainless steel can make up the defects of the TWIP steel in performance, and the comprehensive performance of the stainless steel metal and the high toughness of the TWIP steel can be effectively combined by a vacuum hot rolling method, so that the mechanical property of the TWIP steel is improved. The strength of the material is 700-1600 MPa, the elongation is 10-60%, the preparation process can be automatically adjusted according to actual needs, the application range is wide, the preparation process is simple, green and pollution-free, and the material conforms to the policy of energy conservation and emission reduction advocated by the state.
The specific advantages of the method are as follows: a) The assembly is placed in a heating furnace and is kept warm for 1-3 hours, so that the material can be completely transformed into an austenite structure and the grain size can not grow. Thus, the two materials are uniformly deformed in the subsequent rolling process, so that the stress concentration at the interface of the two materials is reduced. b) Compared with the prior patent, the thickness of the two raw materials is selected and controlled to be about 1mm, so that the interface combination of the two materials is more stable and the structure is more uniform after hot rolling with larger deformation. c) The reduction amount of each time is controlled to be 20-30% in the hot rolling process, and the material can be uniformly deformed by each time of pressing. d) Annealing treatment is carried out on the material after cold rolling, the heat preservation time is controlled to be 5-7min, and the long heat preservation time can ensure that the internal stress of the material after cold rolling is completely eliminated. f) The method of the present application may also be carried out by quenching after the hot rolling.
The method has the advantages of simple preparation process, short production period, environmental pollution and moderate regulation and control of the size and the thickness, and is suitable for industrial production.
Drawings
FIG. 1 is a schematic view of a symmetric vacuum package of a hot rolled 304/TWIP composite panel, wherein: 1-steel plate, 2-seal, 3-high temperature isolation cloth, 4-stainless steel tube, 5-SUS 304 stainless steel sheet, 6-TWIP steel sheet.
Detailed Description
The present invention is further explained with reference to the following examples, which should not be construed as limiting the scope of the present invention.
The invention relates to a high-performance corrosion-resistant TWIP/stainless steel multilayer composite material which comprises a plurality of TWIP steel material layers and a plurality of stainless steel material layers, wherein the plurality of TWIP steel material layers and the plurality of stainless steel material layers are alternately laminated and rolled together, the surface layers of the composite material are stainless steel layers, the number of layers of the TWIP steel material layers and the stainless steel material layers is not less than ten, the thickness of each layer of the multilayer composite material is not more than 0.05mm, the thickness of the multilayer composite material is related to the thickness and the number of layers of raw materials, and the number of layers of the TWIP steel material layers is 1 less than that of the stainless steel material layers.
The thickness ratio of the TWIP steel material layer to the stainless steel material layer is 1.5-2, and the thickness ratio can be adjusted according to actual requirements.
The preparation method of the material comprises the following steps: the stainless steel and the TWIP steel material plates are cut and laminated in a multi-layer mode, the stainless steel plates are guaranteed to be located on the surface layer of a combined blank in the laminating process, so that the corrosion resistance of the materials is guaranteed, four sealing strips are used for surrounding the laminated TWIP/stainless steel materials to form a groove, the upper end and the lower end of the groove are packaged by using covers to form a box body, argon arc welding is used for welding to obtain a sealed combined blank, the sealing and vacuumizing process is carried out, multi-pass hot rolling forming is carried out on a hot rolling mill through high-temperature heating and heat preservation in a furnace, and the total rolling reduction is guaranteed to be 90%.
After hot rolling, heat treatment processes (heat preservation and quenching or annealing treatment, cold rolling and annealing treatment) can be carried out continuously to obtain better interlayer interface combination and micron-scale layer thickness dimension, and the purpose of strengthening and toughening the layered composite material is achieved.
The method comprises the following steps:
the first step, pretreatment: taking a stainless steel sheet and a TWIP steel sheet with the same size and the thickness of 0.3-2 mm, respectively putting the stainless steel sheet and the TWIP steel sheet into 95% alcohol, carrying out ultrasonic cleaning, then drying and polishing until an oxide layer is removed and the metallic luster is exposed;
step two, sealing and assembling: stacking stainless steel sheets and TWIP steel sheets at intervals, ensuring that the stainless steel sheets are positioned on the surface layer of a blank in the stacking process so as to ensure the corrosion resistance of the material, and fixing the TWIP/stainless steel stacked material by four sealing strips through argon arc welding; wherein 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;
placing the same-size isolation cloth at two ends of the lamination, then respectively placing two steel plates at the upper end and the lower end of the seal, and welding and sealing the steel plates and the seal by argon arc welding;
the shape and size of the steel plate are determined according to the shape and size surrounded by the stainless steel sealing strip, the thickness is determined according to the stacking height, the stacking height is high, the thickness of the steel plate is large, and vice versa.
Step three, vacuumizing: drilling a through hole with the diameter of 6mm between sealing strips in a sealed assembly, welding a stainless steel pipe on the small hole, checking through leakage checking equipment to ensure that the welding and the packaging are complete (the leakage checking method is to arrange the assembly in water to inflate and pressurize the stainless steel pipe to see whether bubbles are generated) and then vacuumizing and pumping air in the hole to keep the vacuum degree at 10 by using vacuum equipment comprising a mechanical pump, a magnetic pump and a molecular pump -4 pa heating the stainless steel pipe to 500-1000 ℃ by using an oxygen arc welding gun, sealing the stainless steel pipe by using a hydraulic clamp, and finally sealing the stainless steel pipe by using vacuum mud;
wherein, the outer diameter of the stainless steel pipe is 8-10 mm, and the inner diameter is 6-8 mm;
step four, hot rolling: putting the assembly after vacuumizing into a high-temperature heating furnace for heating, raising the temperature to 1000-1200 ℃ for heat preservation treatment, and preserving the heat for 1-3 h; feeding the heated assembly into a hot rolling mill by a crane for hot rolling, ensuring that the total rolling reduction is 90 percent and the rolling reduction of each time is 20 to 30 percent, and cooling to room temperature;
step five, cold rolling: after hot rolling, sending the material into a cold rolling mill by a crane for cold rolling, wherein the thickness of the cold rolled material is 1/3 of that of the hot rolled material;
sixth step, annealing: the material is kept at 500-800 ℃ for 5-7min, and then air-cooled to room temperature.
In the first step of the above production method, the thickness of each layer of the stainless steel sheet and the TWIP steel sheet is 1mm or less.
The thickness of each layer of plate is selected to be as thin as possible, so that under larger deformation, most of force acts between layers to improve the bonding strength, the thinner the raw material is, the thinner the thickness of each layer is after hot rolling, the larger energy is consumed by the microcracks penetrating through the interface in the expansion process, and the toughening effect is achieved. On the other hand, the thickness of each layer of the obtained material can be controlled in the micron level, and the deformation coordination capability of the material can be improved. The number of layers can be selected according to the actual required plate thickness, and the larger the final plate thickness, the larger the number of layers stacked. And adjusting subsequent cold rolling and annealing processes according to the required mechanical property, wherein the larger the deformation degree after cold rolling is, the higher the strength is, the higher the annealing temperature is (below the crystallization temperature), and the higher the toughness of the material is.
The method of the invention overlaps the material in multiple layers, and achieves micron-level control of the layer thickness of each layer of material through large compression deformation. The stainless steel is ensured to be positioned on the upper surface layer and the lower surface layer in the lamination process, so that the corrosion resistance of the material is ensured. After the multilayer composite material in a hot rolling state is obtained, the subsequent heat treatment process and the annealing treatment after cold rolling can be flexibly adjusted according to different requirements on mechanical properties.
Example 1:
the stainless steel material specifically used in this example was SUS304 austenitic stainless steel, the total number of stacked TWIP steel and SUS304 stainless steel was 61 layers, and the layer thickness ratio of stainless steel and TWIP steel was 1.
The TWIP steel according to the present embodiment is a well-known material main component widely used in the art: 31.48% si 2.83% al. The TWIP steel has high toughness and elongation of 83.33 percent, but has lower tensile strength of only 600MPa. SUS304 austenitic stainless steel is a well-known material main component widely used in the art: cr:18.5% Ni:8.5% Mn: 2-si. The strength is high but the elongation is low.
The preparation process comprises the following steps:
1: taking 31 SUS304 austenitic stainless steel sheets with the thickness of 0.5mm and 30 TWIP steel sheets respectively, putting the SUS304 austenitic stainless steel sheets and the TWIP steel sheets into 95% alcohol respectively, carrying out ultrasonic cleaning, drying and polishing until an oxide layer is removed and metal luster is exposed.
The sizes of the two materials are 80mm multiplied by 0.5mm
2: the TWIP/304 laminate was fixed by stacking SUS304 stainless steel sheets 5 and TWIP steel sheets 6 (stainless steel layers on the upper and lower surfaces) at intervals and welding four steel seal strips 2 at the periphery by argon arc welding.
The seal has dimensions of 120mm × 36mm × 20mm and 84mm × 18mm × 35mm, and is made of 45 steel
3: two steel plates 1 were placed on both ends of the laminate (and the laminate was separated from the steel plates using a high temperature barrier cloth 3 of 80mm x 80mm size), and the seal and the steel plates were welded together using argon arc welding to form a closed square box.
The size of the steel plate is 84mm multiplied by 2mm
4: drilling a through hole with the diameter of 6mm in the middle of a seal, welding a stainless steel pipe 4 with the outer diameter of 10mm and the inner diameter of 6mm to the edge of the through hole, checking through leakage checking equipment to ensure that welding and packaging are complete (the leakage checking method is to arrange a blank in water to inflate and pressurize the stainless steel pipe to see whether bubbles are generated), and then vacuumizing through vacuum equipment comprising a mechanical pump, a magnetic pump and a molecular pump three-stage pump to evacuate air in the hole to keep the vacuum degree at 10 -4 pa heating the stainless steel pipe to 800 ℃ by using an oxygen arc welding gun, sealing the stainless steel pipe by using a hydraulic clamp, and finally sealing the stainless steel pipe by using vacuum mud.
5: and (4) putting the assembly subjected to vacuum pumping into a high-temperature heating furnace for heating, heating to 1100 ℃ for heat preservation treatment, and preserving heat for 2 hours. 6: and (2) feeding the heated assembly into a hot rolling mill by using a crane for hot rolling, wherein the rolling passes are 8, and the reduction rate of each pass is as follows: the total rolling reduction of 20%, 21%, 22%, 23%, 27%, 32%, 35% was about 90%, and the rolling speed was 1m/s. The yield strength of the material reaches 242MPa, the tensile strength reaches 722MPa, and the elongation reaches 47.7 percent.
Example 2:
the material was subjected to a heat treatment process on the basis of example 1, the material being held at 1050 ℃ for 6min and subsequently quenched.
The yield strength of the material is 253MPa, the tensile strength is 824MPa, and the elongation is 60.5 percent in a tensile test
Example 3:
the material was subjected to a heat treatment process on the basis of example 1, the material being held at 1100 ℃ for 6min and subsequently quenched.
The yield strength of the material reaches 214MPa, the tensile strength reaches 824MPa, and the elongation reaches 22.2 percent in a tensile test
Example 4:
the material was subjected to a heat treatment process on the basis of example 1, the material was kept at 500 ℃ for 30min and then air-cooled.
The yield strength of the material is 280MPa, the tensile strength is 857MPa, and the elongation is 38.89 percent in a tensile test
Example 5:
the material was subjected to a heat treatment process based on example 1, holding the material at 600 ℃ for 30min and then air cooling.
The yield strength of the material reaches 326MPa, the tensile strength reaches 906MPa, and the elongation reaches 22 percent in a tensile test
Example 6:
the material was subjected to a heat treatment process on the basis of example 1, the material was kept at 820 ℃ for 3h and subsequently air-cooled.
The yield strength of the material reaches 216MPa, the tensile strength reaches 848MPa, and the elongation reaches 27.8 percent in a tensile test
Example 7:
the material was subjected to a heat treatment process based on example 1, holding the material at 1050 ℃ for 30min and subsequently quenching. The yield strength of the material is 232MPa, the tensile strength is 785MPa, and the elongation is 30.56 percent in a tensile test
Example 8:
the material was subjected to a heat treatment process on the basis of example 1, the material being held at 1100 ℃ for 30min and subsequently quenched.
The yield strength of the material is 205MPa, the tensile strength is 714MPa, and the elongation is 33.33 percent by performing a tensile test on the material
Example 9:
cold rolling the material on the basis of the embodiment 1 until the thickness of the material is 1/3 of the original thickness, namely the cold rolling thickness is 1mm; then annealing treatment is carried out, the material is placed at 500 ℃ for heat preservation for 6min, and then air cooling is carried out.
The yield strength of the material subjected to a tensile test reaches 1606MPa, the tensile strength reaches 1606MPa, and the elongation reaches 10.55 percent
Example 10:
in the embodiment, the material is subjected to cold rolling and annealing treatment on the basis of the embodiment 1, the material is cold-rolled to 1mm, the temperature is controlled below the crystallization temperature and is kept at 600 ℃ for 6min, and finally, the material is air-cooled to the room temperature.
The yield strength of the material is 757MPa, the tensile strength is 1245MPa, and the elongation is 11.38 percent by a tensile test
Example 11:
the procedure of this example was the same as in example 10, except that the annealing temperature was 700 ℃.
The yield strength of the material is 632MPa, the tensile strength is 998MPa, and the elongation is 24.52 percent in a tensile test
Example 12:
the procedure of this example is the same as that of example 10, except that the annealing temperature is 800 ℃.
The yield strength of the material reaches 452MPa, the tensile strength reaches 919MPa, and the elongation reaches 30.56 percent in a tensile test
The results of the performance testing of the above examples are shown in the following table:
the material is subjected to different heat treatment processes, the yield strength of the material is not obviously improved, but the tensile strength of the material can be improved to different degrees, the yield strength and the tensile strength of the material can be obviously improved by annealing the material after cold rolling, and the treatment process of the material can be adjusted according to different requirements on the mechanical properties of the material. The tables show that the mechanical properties of the materials are changed to different degrees after the materials are processed by different processes.
The tensile strength of the TWIP steel can be improved to different degrees through different heat treatment processes, the tensile strength of the material subjected to different heat treatment processes after hot rolling is improved to a limited extent, but the tensile strength of the material can be improved to a great extent by performing cold rolling after hot rolling, and the process can be adjusted according to actual requirements.
The above examples of the present invention are merely illustrative and not restrictive of the embodiments of the present invention. It will be apparent to those skilled in the art that other variations and modifications can be made based on the above description, and it is not intended to be exhaustive of all embodiments, and all obvious variations and modifications can be made without departing from the scope of the invention.
The invention is not the best known technology.
Claims (7)
1. A high-performance corrosion-resistant TWIP/stainless steel multilayer composite material comprises a plurality of TWIP steel material layers and a plurality of stainless steel material layers, wherein the plurality of TWIP steel material layers and the plurality of stainless steel material layers are alternately laminated and rolled together, the surface layers of the composite material are stainless steel layers, the thickness of each layer of the material in the multilayer composite material is not more than 0.05mm, and the number of layers of the TWIP steel material layers is 1 less than that of the stainless steel material layers.
2. The composite material of claim 1, wherein the layer thickness ratio of the TWIP steel material layer to the stainless steel material layer is 1.
3. A method for preparing the composite material as claimed in claim 1, wherein the stainless steel and the TWIP steel material are cut and laminated in multiple layers, the stainless steel plate is positioned on the surface of the assembly during the laminating process, four sealing strips are used to surround the laminated TWIP/stainless steel material to form a groove, the upper end and the lower end of the groove are sealed by using covers to form a box body, the upper end and the lower end of the box body are welded by argon arc welding to obtain a sealed assembly, the sealed assembly is sealed and vacuumized, and the hot rolling forming is carried out on a hot rolling mill in multiple passes through high-temperature heating and heat preservation in a furnace, so that the total rolling reduction is ensured to be 90%.
4. The method according to claim 3, wherein the hot rolling is followed by a heat treatment process, and the heat treatment process comprises heat preservation and quenching or annealing, cold rolling and annealing.
5. The method of claim 4, comprising the steps of:
the first step, pretreatment: taking a stainless steel sheet and a TWIP steel sheet with the same size and the thickness of 0.3-2 mm, respectively putting the stainless steel sheet and the TWIP steel sheet into 95% alcohol, carrying out ultrasonic cleaning, then drying and polishing until an oxide layer is removed and the metallic luster is exposed;
step two, sealing and assembling: stacking stainless steel sheets and TWIP steel sheets at intervals, ensuring that the stainless steel sheets are positioned on the surface layer of a blank in the stacking process, and fixing the TWIP/stainless steel stacked material at the periphery by four sealing strips through argon arc welding; wherein 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;
placing the same-size isolation cloth at two ends of the lamination, then respectively placing two steel plates at the upper end and the lower end of the seal, and welding and sealing the steel plates and the seal by argon arc welding;
step three, vacuumizing: drilling a through hole between sealing strips in a sealed assembly, welding a stainless steel pipe on the through hole, checking through leakage checking equipment to ensure that welding and packaging are complete, vacuumizing by using vacuum equipment containing a mechanical pump, a magnetic pump and a molecular pump three-stage pump to remove air in the hole and keep the vacuum degree at 10 -4 pa heating the stainless steel pipe to 500-1000 ℃ by using an oxygen arc welding gun, sealing the stainless steel pipe by using a hydraulic clamp, and finally sealing the stainless steel pipe by using vacuum mud;
step four, hot rolling: putting the assembly after vacuumizing into a high-temperature heating furnace for heating, raising the temperature to 1000-1200 ℃ for heat preservation treatment, and preserving the heat for 1-3 h; feeding the heated assembly into a hot rolling mill by using a crane for hot rolling, ensuring that the total rolling reduction is 90 percent and the rolling reduction of each time is 20-30 percent, and cooling to room temperature;
step five, cold rolling: after hot rolling, sending the material into a cold rolling mill by a crane for cold rolling, wherein the thickness of the cold rolled material is 1/3 of that of the hot rolled material;
sixth step, annealing: the material is kept at 500-800 ℃ for 5-7min, and then air-cooled to room temperature.
6. The production method according to claim 5, wherein the stainless steel sheet and the TWIP steel sheet in the first step each have a material thickness of 1mm or less.
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 ℃, and the heat preservation time is 6-30 min; heat preservation and annealing treatment, wherein the heat preservation temperature is 500-800 ℃, and the heat preservation time is 0.5-3 h.
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