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Low-temperature high-strain-rate superplastic medium manganese steel and preparation method thereof

A high strain rate, superplastic technology, applied in the field of high strength steel, can solve the problems of low forming speed and high forming temperature, achieve the effect of improving performance, realizing microstructure and inhibiting the growth of grains

Active Publication Date: 2022-04-12
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing superplastic deformation conditions of medium manganese steel have two disadvantages: (1) the forming temperature is relatively high, often above 800°C; (2) the forming speed is low, and the strain rate is often 10 -3 Below / s

Method used

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  • Low-temperature high-strain-rate superplastic medium manganese steel and preparation method thereof
  • Low-temperature high-strain-rate superplastic medium manganese steel and preparation method thereof
  • Low-temperature high-strain-rate superplastic medium manganese steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A low-temperature high-strain rate superplastic medium manganese steel, the chemical composition of which is calculated by mass percentage: C is 0.05wt%, Mn is 5.0wt%, Nb is 0.05wt%, V is 0.05wt%, and the balance is Fe and unavoidable impurities. The medium manganese steel has a duplex austenite and ferrite microstructure, the microstructure is uniform equiaxed austenite and ferrite grains, and the austenite and ferrite grains have the same size Below 0.3um.

[0036] The preparation method of above-mentioned medium manganese steel comprises the following steps:

[0037] Step 1, smelting: through vacuum smelting, the vacuum degree is about 80Pa, the raw materials are melted and micro-alloyed, and cast to obtain the required ingot;

[0038] Step 2, forging: heating the steel ingot to 1100°C, holding it for 3 hours, and forging it into a steel billet with a cross-sectional area of ​​100mm×40mm;

[0039] Step 3, low-temperature hot rolling: the steel billet is heated to ...

Embodiment 2

[0049] A low-temperature high-strain rate superplastic medium-manganese steel, the chemical composition of which is calculated by mass percentage: C is 0.15wt%, Mn is 8.0wt%, Al is 3.0wt%, Nb is 0.15wt%, V is 0.1wt% , the balance is Fe and unavoidable impurities. The medium manganese steel has a duplex austenite and ferrite microstructure, the microstructure is uniform equiaxed austenite and ferrite grains, and the austenite and ferrite grains have the same size Below 0.3um.

[0050] The preparation method of above-mentioned medium manganese steel comprises the following steps:

[0051] Step 1, smelting: through vacuum smelting, the vacuum degree is about 100Pa, the raw materials are melted and micro-alloyed, and cast to obtain the required ingot;

[0052] Step 2, forging: heating the steel ingot to 1200°C, holding it for 4 hours, and forging it into a steel billet with a cross-sectional area of ​​100mm×40mm;

[0053] Step 3, low-temperature hot rolling: the billet is heate...

Embodiment 3

[0063] A low temperature high strain rate superplastic medium manganese steel, the chemical composition of which is calculated by mass percentage: C is 0.11wt%, Mn is 6.5wt%, Al is 1.4wt%, Nb is 0.05wt%, V is 0.08wt% , the balance is Fe and unavoidable impurities. The medium manganese steel has a duplex austenite and ferrite microstructure, the microstructure is uniform equiaxed austenite and ferrite grains, and the austenite and ferrite grains have the same size Below 0.3um.

[0064] The preparation method of above-mentioned medium manganese steel comprises the following steps:

[0065] Step 1, smelting: through vacuum smelting, the vacuum degree is about 100Pa, the raw materials are melted and micro-alloyed, and cast to obtain the required ingot;

[0066] Step 2, forging: heating the steel ingot to 1200°C, holding it for 3 hours, and forging it into a steel billet with a cross-sectional area of ​​100mm×40mm;

[0067] Step 3, low-temperature hot rolling: the steel billet i...

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Abstract

The invention discloses low-temperature high-strain-rate superplastic medium manganese steel and a preparation method thereof. The medium manganese steel comprises the following chemical components in percentage by mass: 0.05-0.15% of C; 5 to 8 percent of Mn; 0 to 3 percent of Al; 0.05% to 0.15% of Nb; 0.05 to 0.1 percent of V, and the balance of Fe and inevitable impurities; the medium manganese steel has a double-phase austenite and ferrite microstructure, the microstructure is uniform equiaxed austenite and ferrite grains, and the sizes of the austenite grains and the ferrite grains are both 0.3 mu m or below. The preparation method of the medium manganese steel comprises the following steps: (1) smelting a steel ingot with composition proportion; (2) heating and forging; (3) carrying out low-temperature hot rolling; (4) carrying out circulating quenching heat treatment, (5) carrying out high-reduction-rate cold rolling, and (6) carrying out critical heat treatment, so as to finally obtain a superfine austenite and ferrite double-phase medium manganese steel plate (the average grain size is less than 0.3 mu m).

Description

technical field [0001] The invention relates to the technical field of high-strength steel, in particular to a low-temperature high-strain rate superplastic medium manganese steel and a preparation method thereof. Background technique [0002] The rapid development of the automobile industry in recent years has brought a series of problems such as environmental pollution and energy shortage. Environmental protection, energy saving and safety have become the development themes of the automobile manufacturing industry. Among the many measures to save fuel consumption and reduce exhaust emissions, the effect of automobile lightweight is the most obvious. There are two main ways to reduce the weight of automobiles: one is to use lightweight materials, such as aluminum alloys, magnesium alloys, engineering plastics, and composite materials; the other is to use advanced high-strength steels. Compared with magnesium, aluminum and their alloys, advanced high-strength steel can sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/12C21D8/02C21D1/18
CPCY02P10/20
Inventor 潘海军刘麟李京刘文明江鹏王知鸷吴王平苗乃明
Owner CHANGZHOU UNIV