退火软化对高强度钢300M组织及硬度的影响

doi:10.13251/j.issn.0254-6051.2021.03.020

金属热处理 ›› 2021, Vol. 46 ›› Issue (3): 100-103.DOI: 10.13251/j.issn.0254-6051.2021.03.020

退火软化对高强度钢300M组织及硬度的影响

王洪利^1,3, 吴铖川^1,3, 杜思敏^1,3, 李源^2,3, 罗祥华^2,3, 叶文冰^2,3

1.成都先进金属材料产业技术研究院有限公司特钢技术研究所, 四川成都 610300;
2.攀钢集团江油长城特殊钢有限公司科技部, 四川江油 621701;
3.海洋装备用金属材料及其应用国家重点实验室, 辽宁鞍山 114009

收稿日期:2020-11-15 出版日期:2021-03-25 发布日期:2021-05-08
作者简介:王洪利(1986—),女,高级工程师,硕士,主要研究方向为钢铁材料的组织与性能,E-mail:524114025@qq.com

Effect of annealing soften on microstructure and hardness of high strength steel 300M

Wang Hongli^1,3, Wu Chengchuan^1,3, Du Simin^1,3, Li Yuan^2,3, Luo Xianghua^2,3, Ye Wenbing^2,3

1. Chengdu Advanced Metal Materials Industrial Technolgy Research Institute Co., Ltd., Chengdu Sichuan 610300, China;
2. Science and Technology Department,Changcheng Special Steel Company of Pangang Group, Jiangyou Sichuan, 621701, China;
3. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009, China

Received:2020-11-15 Online:2021-03-25 Published:2021-05-08

摘要/Abstract

摘要： 为提高300M钢的后续切削性能,拓宽300M钢的应用领域,研究了退火软化工艺对300M高强度钢显微组织及硬度的影响。结果表明,300M钢在Ac₁以下(730 ℃)退火,显微组织由马氏体转变为回火索氏体,碳化物呈球状或颗粒状;在两相区(780 ℃)退火,显微组织为珠光体+先共析铁素体,碳化物呈球状或短棒状;在Ac₃以上(860 ℃)退火,显微组织转变为珠光体+先共析铁素体,碳化物呈长薄片状。退火冷速对300M钢软化影响显著,冷速缓慢才能使碳化物充分析出并球化,硬度显著降低。300M钢两相区等温+缓慢冷却退火工艺下有更显著的软化效应,硬度可控制在240 HBW以下。

关键词: 300M钢, 退火, 显微组织, 硬度

Abstract: In order to improve the subsequent machinability of 300M steel and widen the application field, the effect of annealing process on microstructure and hardness of 300M steel was studied. The results show that annealing at 730 ℃ below Ac₁, the microstructure of 300M steel is transformed from martensite to tempered sorbite with spherical or granular carbides. The microstructure is consisting of ferrite, lamellar pearlite with partial spheroid carbides when annealing at 780 ℃ in intercritical phase region. Annealing at 860 ℃ above Ac₃, The microstructure is ferrite and lamellar pearlite with long thin sheet carbide. The cooling rate has a significant effect on the hardness of 300M steel, the slow cooling rate results in the spheroidization of carbides and the decrease of hardness. The softening effect of 300M steel is more obvious annealing at intercritical phase region with low cooling rate, and the hardness can be less than 240 HBW.

Key words: 300M steel, annealing, microstructure, hardness

中图分类号:

TG156.2

王洪利, 吴铖川, 杜思敏, 李源, 罗祥华, 叶文冰. 退火软化对高强度钢300M组织及硬度的影响[J]. 金属热处理, 2021, 46(3): 100-103.

Wang Hongli, Wu Chengchuan, Du Simin, Li Yuan, Luo Xianghua, Ye Wenbing. Effect of annealing soften on microstructure and hardness of high strength steel 300M[J]. Heat Treatment of Metals, 2021, 46(3): 100-103.

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退火软化对高强度钢300M组织及硬度的影响

Effect of annealing soften on microstructure and hardness of high strength steel 300M

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