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Nano/superfine medium-manganese TRIP (transformation induced plasticity) steel plate and warm-rolling preparation method thereof

A nano and steel plate technology, which is applied in the field of nano/ultrafine medium manganese TRIP steel plate and its warm rolling preparation, can solve the problems of difficult plate shape control, large instantaneous elastic modulus, increased production cost, etc., and achieve cooling rate Less sensitivity, improved strength and plasticity, and lower hot stamping temperature

Active Publication Date: 2016-08-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second generation of AHSS steel for automobiles is a microstructure dominated by austenite, which has both high strength and high plasticity. wt.%), which greatly increases the production cost and deteriorates the performance of the smelting process
However, this poses a great challenge to the production technology and practical application of high-strength or even ultra-high-strength medium-manganese steel, mainly reflected in: (1) Comparing with conventional low-carbon microalloy HSLA (High Strength Low Alloy) and double Compared with DP (Dual phase) steel, the instantaneous elastic modulus of TRIP (Transformation-induced Plasticity) steel plate is larger, resulting in excessive springback during cold rolling of the steel plate; When the strength (~1500MPa) is used for automotive structural parts, the parts have severe springback, poor dimensional accuracy and short life of the forming die, etc.
Therefore, this conventional three-stage production process is complicated, the production cycle is long, the shape control is difficult, and it is not conducive to industrial production.

Method used

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  • Nano/superfine medium-manganese TRIP (transformation induced plasticity) steel plate and warm-rolling preparation method thereof
  • Nano/superfine medium-manganese TRIP (transformation induced plasticity) steel plate and warm-rolling preparation method thereof
  • Nano/superfine medium-manganese TRIP (transformation induced plasticity) steel plate and warm-rolling preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A nano / ultrafine medium manganese TRIP steel plate, its chemical composition and content are: C is 0.20wt.%, Si is 0.05wt.%, Mn is 5.59wt.%, Al is 1.22wt.%, N is 0.014wt.%, Nb is 0.06wt.%, Mo is 0.22wt.%, and the balance is Fe and unavoidable impurities.

[0043] The warm rolling preparation method of the nano / ultrafine medium manganese TRIP steel plate comprises the following steps:

[0044] (1) Melting: According to the chemical composition and ingredients of the nano / ultrafine medium manganese TRIP steel plate, add it to the vacuum induction melting furnace, melt it at 1650°C, and cast it to obtain a 50kg round ingot;

[0045] (2) Forging: heat a 50kg round ingot at 1150°C for 2 hours, forge it, and air-cool it to room temperature to obtain a 100mm×100mm square ingot, and cut the square ingot into 30mm×100mm×100mm;

[0046] (3) Hot rolling: After heating the cut square ingot to 1200°C and keeping it warm for 0.5h, hot rolling is carried out 6 times on a two-roll hot...

Embodiment 2

[0050] A kind of nano / ultrafine medium manganese TRIP steel plate, after the same smelting, forging, hot rolling, and warm rolling steps as in Example 1, then the nanometer / ultrafine medium manganese TRIP steel plate is heat treated, heated to 650°C, Keep warm for 30min, then air-cool to room temperature to prepare nano / ultrafine medium manganese TRIP heat-treated steel plate. %.

Embodiment 3

[0052] A nano / ultrafine medium manganese TRIP steel plate, its chemical composition and content are: C is 0.25wt.%, Si is 0.50wt.%, Mn is 5.00wt.%, Al is 1.00wt.%, N is 0.03wt.%, Nb is 0.06wt.%, Mo is 0.25wt.%, and the balance is Fe and unavoidable impurities.

[0053] The warm rolling preparation method of the nano / ultrafine medium manganese TRIP steel plate comprises the following steps:

[0054] (1) Melting: According to the chemical composition and ingredients of the nano / ultrafine medium manganese TRIP steel plate, add it to the vacuum induction melting furnace, melt it at 1600°C, and cast it to obtain a 50kg round ingot;

[0055] (2) Forging: heat a 50kg round ingot at 1250°C for 1 hour, forge it, and air-cool it to room temperature to obtain a 100mm×100mm square ingot, and cut the square ingot into 40mm×100mm×100mm;

[0056] (3) Hot rolling: After heating the cut square ingot to 1100°C and keeping it warm for 1.5 hours, hot rolling is carried out 6 times on a two-roll ...

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Abstract

The invention relates to a nano / superfine medium-manganese TRIP (transformation induced plasticity) steel plate and a warm-rolling preparation method thereof, belonging to the technical field of ultrahigh-strength steel. The nano / superfine medium-manganese TRIP steel plate comprises the following chemical components in percentage by weight: 0.17-0.25wt.% of C, 0.00-0.50wt.% of Si, 5.00-7.00wt.% of Mn, 1.00-1.50wt.% of Al, 0.014-0.03wt.% of N, 0.00-0.06wt.% of Nb, 0.00-0.25wt.% of Mo, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: smelting, forging, carrying out hot rolling, and carrying out warm rolling to obtain the nano / superfine medium-manganese TRIP steel plate; and carrying out heat treatment on the steel plate to obtain the nano / superfine medium-manganese TRIP heat-treated steel plate. By using the warm-rolling technique instead of the typical technique for producing manganese steel, the method provided by the invention has the advantages of simple technique, short production cycle and controllable plate shape. The prepared steel plate has a nano / superfine structure, has the advantages of high strength and favorable properties, and satisfies the target requirements of resource saving, energy consumption reduction, light weight and crash safety enhancement for automobile industry.

Description

technical field [0001] The invention belongs to the technical field of ultra-high strength steel, and in particular relates to a nano / ultrafine medium manganese TRIP steel plate and a warm rolling preparation method thereof. Background technique [0002] Lightweight technology is the main direction of the automobile industry to achieve the goal of energy saving and emission reduction. In order to reduce vehicle weight and improve safety, high-strength or ultra-high-strength steel plates for automobiles have become a trend. The first generation of advanced high-strength steel (Advanced High Strength Steel, AHSS) for automobiles is a multiphase microstructure based on ferrite. It will be reduced, and its strong plastic product is lower than 25.00GPa%. The second generation of AHSS steel for automobiles is a microstructure dominated by austenite, which has both high strength and high plasticity. wt.%), which greatly increases the production cost and deteriorates the performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/06C21D8/02
CPCC21D8/0226C21D8/0231C21D8/0247C21D2211/001C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 蔡明晖丁桦潘海军霍奇森·皮特
Owner NORTHEASTERN UNIV
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