A kind of high-strength steel with nano, layered and metastable skeletal tissue and its preparation method

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

Active Publication Date: 2021-07-09
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of high-strength steel with nano, layered and metastable skeletal tissue and its preparation method
  • A kind of high-strength steel with nano, layered and metastable skeletal tissue and its preparation method
  • A kind of high-strength steel with nano, layered and metastable skeletal tissue and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing high-strength steel with nano, layered and metastable skeletal tissue, comprising the following steps;

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

[0024] 2), vacuum smelting and casting the alloy components weighed in step 1), and then forging at a temperature of 1050° C., with a forging ratio of 3.0, to obtain a forged billet with a thickness of 30 mm;

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

[0026] 4), heat treatment, the obtained cold-rolled plate with a thickness of 1.5mm is kept at 1050° C. for 15 minutes, water quenched...

Embodiment 2

[0030] A method for preparing high-strength steel with nano, layered and metastable skeletal tissue, comprising the following steps;

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

[0032] 2), vacuum smelting and casting the alloy components weighed in step 1), and then forging at a temperature of 1150° C., with a forging ratio of 1.5, to obtain a forged billet with a thickness of 50 mm;

[0033] 3) Heat a 50mm thick forging billet at 1250°C for 2.0h, then hot-roll it at 1100°C, the total reduction rate is 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, the obtained cold-rolled plate with a thickness of 1.5mm is kept at 1100° C. for 20 minutes, water quenched to room tempe...

Embodiment 3

[0038] A method for preparing high-strength steel with nano, layered and metastable skeletal tissue, comprising the following steps;

[0039] 1), weigh the alloy composition, weigh 0.06wt.% of C, 9.0wt.% of Mn, 4wt.% of Cu, 1.0wt.% of Ni, 2wt.% of Al according to the weight percentage of the alloy composition, and 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 forged billet with a thickness of 50 mm;

[0040] 3) Heat a 50mm thick forging billet at 1220°C for 2.2h, then hot-roll it at 1130°C, the total reduction rate is 92%, to obtain a hot-rolled plate with a thickness of 4.0mm, and then perform cold rolling, the reduction rate 55% to obtain a cold-rolled sheet with a thickness of 1.8mm;

[0041] 4), heat treatment, the obtained cold-rolled plate with a thickness of 1.8mm is kept at 1020° C. for 25 minutes, water quenched to room temperature, then kept at...

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Abstract

The invention relates to a high-strength steel with nanometer, layered and metastable skeletal tissue, the weight percent of the alloy composition is: C: 0.01-0.1wt.%, Mn: 7.0-11.0wt.%, Cu: 1.5-4.0wt. .%, Ni: 1.0-3.0wt.%, Al: 1.0-2.0wt.%, and the balance is Fe; the present invention also relates to a preparation method of high-strength steel with nanometer, layered and metastable skeletal tissue, Including the processes of weighing alloy components, smelting, casting, forging, hot rolling, cold rolling and heat treatment, the purpose of the present invention is to provide a high-strength steel with nano, layered and metastable skeletal tissue and its preparation method. It has excellent mechanical properties, low production cost and wide process window, and has great application prospects.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and relates to a nanostructure, layered and metastable structure. Background technique [0002] High-strength steel is a commonly used material, which is widely used in the field of automotive materials, but there are certain defects in the existing high-strength steel, such as the typical 15-5PH maraging high-strength steel, its tensile strength is greater than 1000MPa, The elongation after fracture is 10-20%, and the corrosion resistance is good, but due to its high alloy cost and medium plasticity, it is not suitable for automotive steel; Mn steel, a typical third-generation automotive steel, is tensile The strength is 900-1400MPa, and the elongation after fracture is 20-40%. The comprehensive mechanical properties are very excellent, but the disadvantage of medium manganese steel is its low hole expansion rate. The characteristics determine its poor formability; the typical...

Claims

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Application Information

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Patent Type & Authority Patents(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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