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High-strength steel with nanometer, layered and metastable skeletal structure and preparing method thereof

A high-strength steel and bone technology, applied in delaminated and metastable structures, the microstructure is in the nano field, to achieve the effect of increasing plasticity

Active Publication Date: 2020-10-02
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-strength steel with nanometer, layered and metastable skeletal tissue and its preparation method to solve the defects of existing high-strength steel

Method used

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  • High-strength steel with nanometer, layered and metastable skeletal structure and preparing method thereof
  • High-strength steel with nanometer, layered and metastable skeletal structure and preparing method thereof
  • High-strength steel with nanometer, layered and metastable skeletal structure and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing high-strength steel with nanometer, layered and metastable bone tissue, including the following steps;

[0023] 1) Weigh the alloy composition, weigh out 0.04wt.% C, 7.0wt.% Mn, 2.0wt.% Cu, 3.0wt.% Ni, 1.5wt.% Al according to the weight percentage of the alloy composition. The balance is Fe;

[0024] 2). Vacuum smelt and cast the alloy components weighed in step 1), and then forge at 1050°C with a forging ratio of 3.0 to obtain a forging blank with a thickness of 30mm;

[0025] 3). Hold the 30mm thick forging billet at 1200°C for 2.0h, and then perform hot rolling at 1150°C with a total reduction rate of 90% to obtain a hot-rolled plate with a thickness of 3.0mm, and then perform cold rolling, the reduction rate 50% to obtain a cold-rolled sheet with a thickness of 1.5mm;

[0026] 4) Heat treatment: heat the resulting cold-rolled sheet with a thickness of 1.5mm at 1050°C for 15min, water quench it to room temperature, then heat it at 550°C for 5h, and ai...

Embodiment 2

[0030] A method for preparing high-strength steel with nanometer, layered and metastable bone tissue, including the following steps;

[0031] 1) Weigh the alloy composition, weigh 0.01wt.% C, 8.0wt.% Mn, 1.5wt.% Cu, 2.0wt.% Ni, 1.0wt.% Al according to the weight percentage of the alloy composition, The balance is Fe;

[0032] 2). Vacuum smelt and cast the alloy components weighed in step 1), and then perform forging at a temperature of 1150°C with a forging ratio of 1.5 to obtain a forging blank with a thickness of 50mm;

[0033] 3). Hold the 50mm thick forging billet at 1250°C for 2.0h, and then perform hot rolling at 1100°C, with a total reduction rate of 94%, to obtain a hot-rolled plate with a thickness of 3.0mm, and then perform cold rolling, the reduction rate 50% to obtain a cold-rolled sheet with a thickness of 1.5mm;

[0034] 4) Heat treatment: heat the obtained cold-rolled sheet with a thickness of 1.5mm at 1100°C for 20 minutes, water quench it to room temperature, then he...

Embodiment 3

[0038] A method for preparing high-strength steel with nanometer, layered and metastable bone tissue, including the following steps;

[0039] 1) Weigh the alloy composition, weigh out 0.06wt.% C, 9.0wt.% Mn, 4wt.% Cu, 1.0wt.% Ni, 2wt.% Al according to the weight percentage of the alloy composition, the balance 2), vacuum smelting and casting the alloy components weighed in step 1), and then forging at a temperature of 1100°C with a forging ratio of 2, to obtain a forging blank with a thickness of 50mm;

[0040] 3) The forging billet with a thickness of 50mm is kept at 1220℃ for 2.2h, and then hot-rolled at 1130℃, the total reduction is 92%, the hot-rolled plate with a thickness of 4.0mm is obtained, and then cold-rolled, the reduction rate It is 55% to obtain a cold-rolled plate with a thickness of 1.8mm;

[0041] 4) Heat treatment: heat the obtained cold-rolled sheet with a thickness of 1.8mm at 1020°C for 25min, water quench it to room temperature, then heat it at 500°C for 5h, an...

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Abstract

The invention relates to high-strength steel with a nanometer, layered and metastable skeletal structure. The steel is prepared from the alloy components in percentage by weight: C: 0.01 to 0.1%, Mn:7.0 to 11.0%, Cu: 1.5 to 4.0%, Ni: 1.0 to 3.0%, Al: 1.0 to 2.0%, and the balance of Fe. The invention further relates to a method for preparing the high-strength steel with the nanometer, layered andmetastable skeletal structure. The method comprises the steps of weighing alloy components, smelting, casting, forging, hot rolling, cold rolling and heat treating process. The purpose of the invention is to provide the high-strength steel with the nanometer, layered and metastable skeletal structure and a preparation method thereof. The material has excellent mechanical properties, low productioncost, wide process window, and has a huge application prospect.

Description

Technical field [0001] The invention belongs to the technical field of metal material processing, and relates to a nanostructure, a layered and metastable structure. Background technique [0002] High-strength steel is a commonly used material and is widely used in the field of automotive materials. However, existing high-strength steels have certain defects. For example, the typical 15-5PH maraging high-strength steel has a tensile strength greater than 1000MPa. The elongation after fracture is 10-20%, and the corrosion resistance is good, but due to its higher alloy cost and moderate plasticity, it is not suitable for automotive steel; the typical third-generation automotive steel is Mn steel, which is resistant to tension The strength is 900-1400MPa, and the elongation after fracture is 20-40%; the comprehensive mechanical properties are very good, but the disadvantage of the medium manganese steel is that the hole expansion rate is low. After the TRIP effect, the crack is eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/16C22C38/08C22C38/06C21D8/02C21D1/18
CPCC21D1/18C21D8/0221C21D8/0226C21D8/0236C21D8/0247C21D2211/001C21D2211/004C21D2211/008C22C38/04C22C38/06C22C38/08C22C38/16
Inventor 宋成浩孙振忠王皓亮
Owner DONGGUAN UNIV OF TECH
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