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材料导报  2019, Vol. 33 Issue (z1): 377-381    
  金属与金属基复合材料 |
7Cr5Mo2V冷作模具钢回火特性研究
孙朋朋, 闵娜, 左鹏鹏, 吴晓春
上海大学材料科学与工程学院,上海 200444
Study on the Tempering Characteristics of 7Cr5Mo2V Cold Work Die Steel
SUN Pengpeng, MIN Na, ZUO Pengpeng, WU Xiaochun
College of Materials Science and Engineering, Shanghai University, Shanghai 200444
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摘要 采用扫描电镜、高分辨透射电镜结合能谱仪等对7Cr5Mo2V钢淬回火过程中碳化物类型、形貌、成分、分布等进行研究。结果表明:7Cr5Mo2V钢在1 030 ℃淬火、400 ℃回火后,微观组织中存在粗大的富Fe、Cr的M7C3型碳化物,导致其硬度下降。550 ℃回火微观组织中析出相为细小的富Mo和富V碳化物,并存在未溶细小的M3C合金渗碳体。550 ℃回火至24 h,富钒类碳化物转变为条状M6C5型碳化物,富Mo碳化物向短棒状M2C型碳化物转变;回火时间延长至48 h,条状M6C5型碳化物粗化,富Mo类M2C转化为球状M6C型碳化物。由于合金渗碳体中约57.3% Cr和Mo合金取代了Fe,使得合金渗碳体更稳定,因此550 ℃回火时合金的溶解缓慢。
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孙朋朋
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左鹏鹏
吴晓春
关键词:  回火  二次硬化  合金碳化物    
Abstract: The types, morphology, composition and distribution of carbides in 7Cr5Mo2V steel during quenching and tempering were studied by scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM) and energy dispersive spectroscopy (EDS).The experiment results showed that after quenching at 1 030 ℃ and tempering at 400 ℃, coarsen Cr-rich and Fe-rich M7C3 carbides in the 7Cr5Mo2V steel led to the hardness drop. And fine secondary V6C5 and Mo2C should be responsible for the secondary hardening peak when tempered at 550 ℃. After aging at 550 ℃ for 24 hours, V-rich carbides were noodle-like and Mo-rich carbides were short rod-like. After aging at 550 ℃ for 48 hours,V6C5 grew into micron-sized in length while Mo2C transformed into spherical Mo6C. The dissolution of alloy cementite was delayed during 550 ℃ aging, which was attributed that about 57.3% of Fe was substituted by Cr and Mo.
Key words:  tempering    secondary hardening    alloy carbides
               出版日期:  2019-05-25      发布日期:  2019-07-05
ZTFLH:  TG156.5  
基金资助: 国家重点研发计划项目(2016YFB0300400;2016YFB0300402)
作者简介:  孙朋朋,上海大学2016级硕士研究生,主要从事先进工模具钢的研究。闵娜,上海大学材料学院,副研究员。2007年12月毕业于上海交通大学,材料物理与化学博士学位。2008年进入上海大学材料学院微结构重点实验室工作至今,主要从事钢及合金微结构表征,相转变热力学和动力学以及模具钢的 开发与应用minnacy@shu.edu.cn
引用本文:    
孙朋朋, 闵娜, 左鹏鹏, 吴晓春. 7Cr5Mo2V冷作模具钢回火特性研究[J]. 材料导报, 2019, 33(z1): 377-381.
SUN Pengpeng, MIN Na, ZUO Pengpeng, WU Xiaochun. Study on the Tempering Characteristics of 7Cr5Mo2V Cold Work Die Steel. Materials Reports, 2019, 33(z1): 377-381.
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http://www.mater-rep.com/CN/  或          http://www.mater-rep.com/CN/Y2019/V33/Iz1/377
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