Mo含量对高碳钢组织和耐磨性的影响

doi:10.13251/j.issn.0254-6051.2024.09.011

金属热处理 ›› 2024, Vol. 49 ›› Issue (9): 64-71.DOI: 10.13251/j.issn.0254-6051.2024.09.011

Mo含量对高碳钢组织和耐磨性的影响

孙陶安¹, 吴正义¹, 周继顺², 肖丙政³, 王海川¹, 范鼎东¹, 邓爱军¹

1.安徽工业大学冶金工程学院, 安徽马鞍山 243032;
2.安徽工业大学冶金减排与资源综合利用教育部重点实验室, 安徽马鞍山 243032;
3.南京钢铁股份有限公司特钢事业部研发处, 江苏南京 210035

收稿日期:2024-03-05 修回日期:2024-07-26 出版日期:2024-09-25 发布日期:2024-10-29
通讯作者: 邓爱军,副教授,博士,E-mail: ajdeng@ahut.edu.cn
作者简介:孙陶安(1998—),男,硕士研究生,主要研究方向为炼钢连铸,E-mail: 1608748803@qq.com。
基金资助:
国家自然科学基金(51471002);安徽省高等学校自然科学研究重大项目(KJ2020ZD25)

Effect of Mo content on microstructure and wear resistance of high carbon steel

Sun Taoan¹, Wu Zhengyi¹, Zhou Jishun², Xiao Bingzheng³, Wang Haichuan¹, Fan Dingdong¹, Deng Aijun¹

1. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan Anhui 243032, China;
2. Key Laboratory of Metallurgical Emission Reduction and Comprehensive Utilization of Resources, Ministry of Education, Anhui University of Technology, Ma'anshan Anhui 243032, China;
3. R&D Department of Special Steel Division, Nanjing Iron & Steel Co., Ltd., Nanjing Jiangsu 210035, China

Received:2024-03-05 Revised:2024-07-26 Online:2024-09-25 Published:2024-10-29

摘要/Abstract

摘要： 基于JMatpro软件计算分析了不同Mo含量高碳钢(0.95%C)的组织及相含量随温度的变化曲线和CCT曲线,制定了含Mo高碳钢的热处理工艺;利用金相显微镜、扫描电镜观察和干砂磨损机研究了Mo含量对高碳钢组织和耐磨性的影响。结果表明,基于JMatpro计算分析提出的含Mo高碳钢的热处理工艺为770 ℃保温1 h后水淬,200 ℃回火2 h后随炉冷。经该工艺处理的含Mo高碳钢的组织主要为隐晶马氏体、孪晶马氏体和碳化物颗粒。Mo的添加提高了高碳钢的硬度和耐磨性;当Mo含量为3%时,硬度和耐磨性最好,较无Mo高碳钢分别提高16%和30.84%。Mo含量大于3%时,试验钢的晶界会析出更多难以分解的碳化物,堆积成块状碳化物,造成硬度不均、偏差较大,磨损试验时脱落形成凹坑,降低了钢的耐磨性。

关键词: 钼, 高碳钢, 组织, 耐磨性, 硬度, 碳化物

Abstract: Based on JMatpro software, the variation curves of microstructure and phase content with temperature and the CCT curves of high carbon steels (0.95%C) with different Mo contents were calculated and analyzed, and the heat treatment process was determined. The effect of Mo content on the microstructure and wear resistance of the tested steels was studied by means of metallographic microscope, scanning electron microscope and dry sand wear machine. The results show that the heat treatment process of the Mo-bearing high carbon steel based on the JMatpro calculation and analysis is holding at 770 ℃ for 1 h followed by water quenching, and then tempering at 200 ℃ for 2 h followed by furnace cooling. The microstructure of the steel treated by this process is mainly cryptocrystalline martensite, twin martensite and carbide particles. The addition of Mo element improves the hardness and wear resistance of the steel. When the Mo content is 3%, the hardness and wear resistance of the steel are the best, which are 16% and 30.84% higher than that of non-Mo high carbon steel, respectively. When the Mo content is greater than 3%, more carbides that are difficult to decompose will precipitate on the grain boundary of the steel and accumulate seriously, resulting in uneven hardness. These carbides fall off during the wear test to form pits, thus reducing the wear resistance of the steel.

Key words: Mo, high carbon steel, microstructure, wear resistance, hardness, carbide

中图分类号:

TG142

孙陶安, 吴正义, 周继顺, 肖丙政, 王海川, 范鼎东, 邓爱军. Mo含量对高碳钢组织和耐磨性的影响[J]. 金属热处理, 2024, 49(9): 64-71.

Sun Taoan, Wu Zhengyi, Zhou Jishun, Xiao Bingzheng, Wang Haichuan, Fan Dingdong, Deng Aijun. Effect of Mo content on microstructure and wear resistance of high carbon steel[J]. Heat Treatment of Metals, 2024, 49(9): 64-71.

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Mo含量对高碳钢组织和耐磨性的影响

Effect of Mo content on microstructure and wear resistance of high carbon steel

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