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Molybdenum-chromium-alloyed high-strength, high-ductility and high-carbon TWIP steel and preparation method thereof

An alloying and high-strength technology, applied in the field of alloy steel, can solve the problems of reducing production efficiency, low yield strength and tensile strength, and increasing production costs, and achieve the effects of improving production efficiency, reducing production costs, and reducing carbides

Inactive Publication Date: 2015-04-22
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the carbon content of existing TWIP steels is generally below 0.10%. The elongation of these steels is very good, but the yield strength and tensile strength are relatively low. In order to improve the mechanical properties of TWIP steels, increasing the carbon content is an effective method. Therefore, relevant research has been carried out on TWIP steel with a carbon content of 1.10%-1.50%.
For example, the authorized announcement number is CN101956134B, and the patent name is a high-strength, high-plastic copper-containing high-carbon TWIP steel and its preparation process. In this patent, the casting structure of TWIP steel contains a large amount of carbides. Solution treatment at 1000-1055°C for 4-5 hours is required before rolling, followed by water quenching to eliminate carbides, which virtually increases production costs and reduces production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of the molybdenum-chromium alloyed high-strength high-plasticity high-carbon TWIP steel comprises the following steps:

[0025] 1) Smelting: Add the components of the TWIP steel into the vacuum induction furnace in proportion, pass in the protective gas argon to smelt, and cast into billets after smelting;

[0026] 2) Solution treatment: heat the above cast slab to 1050°C for solution treatment, keep it warm for 1.5 hours, and then quench it in water;

[0027] 3) Directly use the solution-treated castings as high-strength and high-plasticity castings.

[0028] The preparation method of the molybdenum-chromium alloyed high-strength high-plasticity high-carbon TWIP steel comprises the following steps:

[0029] 1) Smelting: Add the components of the TWIP steel into the vacuum induction furnace in proportion, pass in the protective gas argon to smelt, and cast into billets after smelting;

[0030] 2) Solution treatment: heat the above cast slab to 1...

Embodiment 1

[0036] Embodiment 1: Molybdenum-chromium alloyed high-strength, high-plasticity, high-carbon TWIP steel of the present invention, its components and weight percentages are: C: 1.20%, Mn: 20.7%, Cr: 0.06%, Mo: 0.95%, and the balance It is Fe and unavoidable impurities.

[0037] The preparation method of the molybdenum-chromium alloyed high-strength high-plasticity high-carbon TWIP steel comprises the following steps:

[0038] 1) Smelting: Add the components of the TWIP steel into the vacuum induction furnace in proportion, pass in the protective gas argon to smelt, and cast into billets after smelting;

[0039] 2) Solution treatment: heat the above cast slab to 1050°C for solution treatment, keep it warm for 1.5 hours, and then quench it in water;

[0040] 3) The solution-treated castings can be directly used as high-strength and high-plasticity castings.

[0041] The TWIP steel obtained by the above method has a tensile strength of 790MPa, a yield strength of 440MPa and an e...

Embodiment 2

[0052] Example 2: Molybdenum-chromium alloyed high-strength, high-plasticity, high-carbon TWIP steel of the present invention, its components and weight percentages are: C: 1.28%, Mn: 18.0%, Cr: 0.06%, Mo: 0.60%, and the balance It is Fe and unavoidable impurities.

[0053] The preparation method of the molybdenum-chromium alloyed high-strength high-plasticity high-carbon TWIP steel comprises the following steps:

[0054] 1) Smelting: Add the components of the TWIP steel into the vacuum induction furnace in proportion, pass in the protective gas argon to smelt, and cast into billets after smelting;

[0055] 2) Solution treatment: heat the above cast slab to 1050°C for solution treatment, keep it warm for 1.5 hours, and then quench it in water;

[0056] 3) The solution-treated castings can be directly used as high-strength and high-plasticity castings.

[0057] The TWIP steel obtained by the above method has a tensile strength of 940MPa, a yield strength of 540MPa and an elon...

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Abstract

The invention discloses molybdenum-chromium-alloyed high-strength, high-ductility and high-carbon TWIP steel and a preparation method thereof. According to the preparation method, few carbides are generated in the casting-state structure of the high-carbon TWIP steel by increasing a carbon content on the basis of Fe-Mn-C series of TWIP steel and adding Mo and Cr in the steel as alloy elements, and only a short-time solution treatment is needed before hot-rolling or cold-rolling, thus greatly simplifying the production process.

Description

technical field [0001] The invention belongs to the field of alloy steels, and in particular relates to molybdenum-chromium alloyed high-strength, high-plasticity, high-carbon TWIP steel and a preparation method thereof. Background technique [0002] With the continuous development of the automobile industry, the requirements for light weight, energy saving and safety of automobiles are getting higher and higher. The use of high-strength steel plates can not only reduce the weight of automobiles, but also improve the passive safety of automobiles. In recent decades, the automotive industry has required steel plates to have good plasticity while increasing strength. TWIP (Twinning Induced Plasticity) steel has good plasticity while ensuring strength. It is the current steel plate material for automobiles. research focus. [0003] At present, the carbon content of existing TWIP steels is generally below 0.10%. The elongation of these steels is very good, but the yield strengt...

Claims

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Application Information

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IPC IPC(8): C22C38/38C21D8/00C21D6/00
Inventor 王明杰蔡曙光朱定一
Owner FUJIAN UNIV OF TECH
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