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High-strength-and-elongation cold-rolling medium manganese TRIP steel with multi-morphology and multi-size austenite structure and preparation method of high-strength-and-elongation cold-rolling medium manganese TRIP steel

A high-strength plastic product, multi-scale technology, applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve problems such as hindering the process of lightweight automobiles, and achieve excellent weldability and good manufacturing process performance.

Active Publication Date: 2019-06-11
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that although the medium manganese TRIP steel has a certain high strength and good plasticity, however, its strength and plasticity are still far behind the second-generation automobile steel plate, which seriously hinders the process of further lightweighting of automobiles.

Method used

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  • High-strength-and-elongation cold-rolling medium manganese TRIP steel with multi-morphology and multi-size austenite structure and preparation method of high-strength-and-elongation cold-rolling medium manganese TRIP steel
  • High-strength-and-elongation cold-rolling medium manganese TRIP steel with multi-morphology and multi-size austenite structure and preparation method of high-strength-and-elongation cold-rolling medium manganese TRIP steel
  • High-strength-and-elongation cold-rolling medium manganese TRIP steel with multi-morphology and multi-size austenite structure and preparation method of high-strength-and-elongation cold-rolling medium manganese TRIP steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) The composition of the alloy material is C: 0.2wt%, Al: 1.5wt%, Mn: 8%, Ce: 0.04wt%, the balance is Fe, and the steel ingot is made by vacuum melting, the riser is removed and the scale is turned off . The steel ingot is forged after being held at 1200°C for 2 hours, the final forging temperature is not lower than 850°C, then air-cooled to room temperature, and finally forged into a billet sample with a thickness of 30mm.

[0040] (2) Heat the steel billet at 1200°C for 1.5h and then carry out multi-pass rolling to a thickness of 4mm, and the final rolling temperature is not lower than 850°C.

[0041] (3) The hot-rolled steel sheet was annealed at 680° C. for 1 hour, then air-cooled to room temperature, and the annealed hot-rolled steel sheet was pickled.

[0042] (4) Then carry out cold rolling in a two-roll cold rolling mill, and finally cold-roll into a cold-rolled steel plate with a thickness of 2.2 mm, with a total reduction of 45%.

[0043] Carry out XRD ana...

Embodiment 2

[0050] (1) The composition of the alloy material is C: 0.15wt%, Al: 1.5wt%, Mn: 8%, Ce: 0.08wt%, the balance is Fe, and the steel ingot is made by vacuum melting, the riser is removed and the scale is turned off . The steel ingot is forged after being held at 1200°C for 2 hours, the final forging temperature is not lower than 850°C, then air-cooled to room temperature, and finally forged into a billet sample with a thickness of 40mm.

[0051] (2) Heat the steel billet at 1200°C for 1.5h and then conduct multi-pass rolling to a thickness of 5mm, and the final rolling temperature shall not be lower than 850°C.

[0052] (3) The hot-rolled steel sheet was annealed at 680° C. for 1 hour, then air-cooled to room temperature, and the annealed hot-rolled steel sheet was pickled.

[0053] (4) Then carry out cold rolling in a two-roll cold rolling mill, and finally cold rolled into a cold-rolled steel plate with a thickness of 2.8mm, and the total reduction is 44%. XRD analysis was pe...

Embodiment 3

[0057] (1) The composition of the alloy material is C: 0.18wt%, Al: 1.5wt%, Mn: 8%, Ce: 0.03wt%, the balance is Fe, and the steel ingot is made by vacuum melting, the riser is removed and the scale is removed by car . The steel ingot is forged after being held at 1200°C for 2 hours, the final forging temperature is not lower than 850°C, then air-cooled to room temperature, and finally forged into a billet sample with a thickness of 30mm.

[0058] (2) Heat the steel billet at 1200°C for 1.5h and then carry out multi-pass rolling to a thickness of 4mm, and the final rolling temperature is not lower than 850°C.

[0059] (3) The hot-rolled steel sheet was annealed at 680° C. for 1 hour, then air-cooled to room temperature, and the annealed hot-rolled steel sheet was pickled.

[0060] (4) Then carry out cold rolling in a two-roll cold rolling mill, and finally cold rolled into a cold-rolled steel plate with a thickness of 2.3mm, and the total reduction is 42.5%. XRD analysis was ...

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Abstract

The invention relates to a preparation method of high-strength-and-elongation cold-rolling medium manganese TRIP steel with a multi-morphology and multi-size austenite structure. The preparation method includes the steps that S1, smelting and forging are conducted, specifically, smelting is conducted to obtain a steel ingot prepared from the components: 0.15-0.20% of C, 7-9% of Mn, 1.0-1.8% of Al,0.03-0.08% of Ce, P is less than 0.008%, S is less than 0.008%, and the balances of Fe and impurities, after the steel ingot is heated to 1200 DEG C and subjected to heat preservation for 1.5-3 h, asteel billet of 30-40 mm is forged, the temperature of finish forging is no less than 850 DEG C, and air cooling is conducted after forging; S2, hot rolling is conducted, specifically, the steel billet is heated to 1200-1250 DEG C and subjected to heat preservation for 1.5-2.5 h, then a steel plate is rolled through multi-pass, and air cooling is conducted; S3, annealing is conducted in a two-phase region, specifically, the steel plate is annealed at 660-690 DEG C for 40-70 min, then air cooling is conducted, and acid pickling is conducted; S4, small deformation cold rolling is conducted, specifically, cold rolling is conducted on the steel plate, and the overall reduction is controlled at 40-55%; and S5, annealing and low tempering are conducted, specifically, the steel plate is heated to660-690 DEG C and subjected to heat preservation for 6-12 min, annealing is conducted, then air cooling is conducted, and tempering is conducted at 180-230 DEG C for 15-25 min. According to the prepared cold-rolling medium manganese TRIP steel, tensile strength is larger than 1250 MPa, yield strength is 920-1060MPa, high-strength-and-elongation is larger than 65GPa.%, and the cold-rolling mediummanganese TRIP steel is close to or better than second-generation TWIP steel.

Description

technical field [0001] The invention relates to the technical field of high-strength plasticity cold-rolled medium manganese TRIP steel, in particular to a preparation process of high-strength plasticity cold-rolled medium-manganese TRIP steel with multi-morphology and multi-scale austenite structure. Background technique [0002] With the continuous improvement of the automotive industry's requirements for safety, energy saving and environmental protection, materials with high impact energy absorption capacity (that is, high strength and high plasticity, also known as "high-strength plastic product") have become an inevitable trend for automotive steel. On the basis of the first generation of automotive steel, people have developed the second generation of automotive TWIP steel, whose strength and plasticity product can be as high as 65GPa·%. However, the alloy composition of TWIP steel is generally greater than 20wt%, and its tensile strength is very low It can exceed the ...

Claims

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Application Information

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IPC IPC(8): C21D1/26C21D1/18C21D6/00C21D8/02C21D9/00C22C38/04C22C38/06
Inventor 张喜亮刘涛刘宏基周骞吕征石银冬赵雷杰
Owner HEBEI UNIV OF ENG
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