硅对中碳低温贝氏体钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2020.09.037

金属热处理 ›› 2020, Vol. 45 ›› Issue (9): 203-209.DOI: 10.13251/j.issn.0254-6051.2020.09.037

硅对中碳低温贝氏体钢组织与性能的影响

郑花^1,2, 胡锋¹, 柯睿^1,2, 吴开明^1,3

1.武汉科技大学国际钢铁研究院高性能钢铁材料及其应用省部共建协同创新中心,湖北武汉 430081;
2.湖北科技学院核技术与化学生物学院,湖北咸宁 437100;
3.材谷金带佛山金属复合材料有限公司,广东佛山 528200

收稿日期:2020-03-12 出版日期:2020-09-25 发布日期:2020-12-29
通讯作者: 吴开明,教授,E-mail:wukaiming@wust.edu.cn
作者简介:郑花(1986—),女,博士研究生,主要研究方向为材料的强韧化,E-mail:412203980@qq.com
基金资助:
国家自然科学基金(51671149);湖北省自然科学基金(2016CFA004,T201903);武汉市科技局应用基础前沿专项(2019010701011382);111项目和武汉科技大学科发院重大科技项目(2018TDX07)

Effect of Si on microstructure and mechanical properties of low temperature bainitic steel with medium carbon

Zheng Hua^1,2, Hu Feng¹, Ke Rui^1,2, Wu Kaiming^1,3

1. Collaborative Innovation Center for Advanced Steels,International Research Institute for Steel Technology,Wuhan University of Science and Technology,Wuhan Hubei 430081,China;
2. School of Nuclear Technology and Chemistry & Biology,Hubei University of Science and Technology,Xianning Hubei 437100,China;
3. Metals Valley & Band Foshan Metallic Composite Materials Co.,Ltd.,Foshan Guangdong 528200,China

Received:2020-03-12 Online:2020-09-25 Published:2020-12-29

摘要/Abstract

摘要： 对Si含量分别为0.3%和1.5%(质量分数)的中碳试验钢进行低温贝氏体热处理,研究了Si对贝氏体钢组织和性能的影响。结果表明:不同Si含量的试验钢的微观组织有较大的差别,其中0.3%Si试样的显微组织主要为贝氏体铁素体束,M/A岛以及大量的渗碳体析出,1.5%Si试样的显微组织主要为贝氏体铁素体束和M/A岛。1.5%Si试样的硬度和冲击性能较0.3%Si试样高,高的硬度主要是固溶强化和细晶强化的作用;高的冲击韧性主要是添加的适量Si可以抑制渗碳体的析出,从而提高残留奥氏体的体积分数及其碳含量,进而产生较为明显的TRIP效应。

关键词: 硅, 显微组织, 低温贝氏体, 残留奥氏体, 力学性能

Abstract: In order to investigate the effect of Si on the microstructure and mechanical properties of bainitic steels,low temperature bainite treatment process was carried out for medium carbon steels with Si content of 0.3wt% and 1.5wt%,respectively.The results show that the microstructure of the steels with different contents of Si are significantly different,the microstructure of the specimen containing 0.3%Si is mainly composed of bainitic ferrite,M/A island and a large amount of cementite,and the microstructure of the specimen containing 1.5% Si is mainly composed of bainitic ferrite and M/A island.The hardness and impact properties of the specimen containing 1.5%Si are higher than that of the specimen containing 0.3%Si.The higher hardness is mainly due to the solid solution strengthening and fine grain strengthening.The main reason for the higher impact properties is that the addition of proper amount of Si can inhibit the precipitation of cementite,thus increasing the volume fraction of retained austenite and its carbon content,thus producing a relatively significant TRIP effect.

Key words: Si, microstructure, low temperature bainite, retained austenite, mechanical properties

中图分类号:

TG142.12

郑花, 胡锋, 柯睿, 吴开明. 硅对中碳低温贝氏体钢组织与性能的影响[J]. 金属热处理, 2020, 45(9): 203-209.

Zheng Hua, Hu Feng, Ke Rui, Wu Kaiming. Effect of Si on microstructure and mechanical properties of low temperature bainitic steel with medium carbon[J]. Heat Treatment of Metals, 2020, 45(9): 203-209.

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硅对中碳低温贝氏体钢组织与性能的影响

Effect of Si on microstructure and mechanical properties of low temperature bainitic steel with medium carbon

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