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Preparation method of bainite/martensite/austenite composite high-strength steel

A bainite and martensite technology, which is applied in the field of preparation of bainite/martensite/austenite multiphase high-strength steel, can solve the problems of easy cracking of components, short distribution time, and difficulty in industrialized production. The effect of good combination of strong plasticity and toughness, good combination of strong plasticity and broad application prospects

Inactive Publication Date: 2013-08-14
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two unavoidable shortcomings in the traditional Q-P-T process: First, in order to obtain the martensitic structure, a faster quenching and cooling rate is required, but for large-sized components, if the quenching and cooling rate is too fast, it is difficult to achieve Consistent with the structure of the core (generally the surface layer is martensite, the core is still mainly pearlite), and the components are also easy to crack; second, for the traditional Q-P-T process, the distribution time is relatively short (the distribution time is generally 10 to 600 seconds , Xu Zuyao, Heat Treatment, 2009 (6)), if the distribution time is too short, it is difficult to achieve industrial production, and it is impossible to achieve temperature uniformity for large-scale components, resulting in inconsistent performance of the surface and core of large-scale components

Method used

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  • Preparation method of bainite/martensite/austenite composite high-strength steel
  • Preparation method of bainite/martensite/austenite composite high-strength steel
  • Preparation method of bainite/martensite/austenite composite high-strength steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) After being smelted by the conventional steelmaking process, it is rolled into a medium-thick steel plate with a thickness of 30mm;

[0026] (2) Heat the above-mentioned steel to 1050°C for 1 hour for austenitization, then use water cooling, cool to 360°C, and immediately reheat to 500°C for distribution treatment. The distribution time is 120 minutes, and after distribution treatment, air cool to room temperature ;

[0027] (3) The above-mentioned steel material is kept at 100° C. for 2 hours for low-temperature tempering treatment.

Embodiment 2

[0029] (1) After being smelted by the conventional steelmaking process, it is rolled into a medium-thick plate with a thickness of 80mm;

[0030] (2) Heat the above steel to 1050°C for 2 hours for austenitization, then use water cooling, cool to 320°C, and immediately reheat to 450°C for distribution treatment. The distribution time is 180 minutes, and after distribution treatment, air cool to room temperature ;

[0031] (3) The above-mentioned steel material is kept at 280° C. for 3 hours for low-temperature tempering treatment.

Embodiment 3

[0033] (1) After smelting by conventional steelmaking process, it is rolled into a steel bar with a diameter of 32mm;

[0034] (2) Heat the above-mentioned steel to 920°C for 1 hour for austenitization, then perform salt bath treatment, cool to 320°C, and immediately reheat to 280°C for distribution treatment. The distribution time is 40 minutes, and air cooling after distribution treatment to room temperature;

[0035] (3) The above-mentioned steel material is kept at 250° C. for 5 hours for low-temperature tempering treatment.

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Abstract

The invention discloses a preparation method of bainite / martensite / austenite composite high-strength steel, belonging to the field of low-alloy high-strength steel. According to the composite high-strength steel, C, Mn, Si and Cr are used as main alloy elements, Al, Ni, Mo, Cu, Nb, Ti, V and the like are added, and the balance is Fe. The preparation method comprises the following steps: smelting, casting, forging or rolling to prepare rails, thick-wall pipes, large-section bars or thick pipes and the like by adopting a conventional steel-smelting process; carrying out austenitizing; controlling cooling by adopting different cooling media to obtain a part of bainite tissue in the cooling process; instantly carrying out distribution treatment and low-temperature tempering treatment so as to finally obtain a bainite / martensite / austenite composite tissue which is good in strong plasticity and toughness coordination, wherein the distribution time is 30-360 minutes. For a component which is large in size and easy to crack in quenching, the bainite / martensite / austenite composite high-strength steel has wide application prospect.

Description

technical field [0001] The invention relates to the field of low-alloy high-strength steel, in particular to a preparation method of bainite / martensite / austenite composite phase high-strength steel. Background technique [0002] In order to reduce the weight of mechanical components to save energy and resources, low-alloy high-strength steels have been widely used in machinery, automobiles, ships, aviation and other fields. For traditional high-strength steels, as the strength increases, the plasticity will gradually deteriorate. Thereby limiting the application of high-strength steel. The traditional high-strength steel heat treatment process is generally based on the quenching-tempering process. In order to improve the plasticity of high-strength steel, Xu Zuyao (Heat Treatment, 2007, 22 (1)) proposed a quenching-partitioning-tempering process (hereinafter referred to as Q-P-T), This process refers to that after the workpiece is austenitized, it is quenched to a certain t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D1/18C21D11/00
Inventor 谭谆礼高古辉桂晓露白秉哲
Owner BEIJING JIAOTONG UNIV
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