7Cr5Mo2V冷作模具钢回火特性研究

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英文篇名：Study on the Tempering Characteristics of 7Cr5Mo2V Cold Work Die Steel 作者：孙朋朋 ; 闵娜 ; 左鹏鹏 ; 吴晓春 英文作者：SUN Pengpeng;MIN Na;ZUO Pengpeng;WU Xiaochun;College of Materials Science and Engineering, Shanghai University; 关键词：回火 ; 二次硬化 ; 合金碳化物 英文关键词：tempering;;secondary hardening;;alloy carbides 中文刊名：CLDB 英文刊名：Materials Reports 机构：上海大学材料科学与工程学院; 出版日期：2019-05-25 出版单位：材料导报 年：2019 期：v.33 基金：国家重点研发计划项目(2016YFB0300400; 2016YFB0300402)~~ 语种：中文; 页：CLDB2019S1083 页数：5 CN：S1 ISSN：50-1078/TB 分类号：386-390

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M_7C_3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M_3C合金渗碳体。550℃回火至24 h,富钒类碳化物转变为条状M_6C_5型碳化物,富Mo碳化物向短棒状M_2C型碳化物转变;回火时间延长至48 h,条状M_6C_5型碳化物粗化,富Mo类M_2C转化为球状M_6C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。
        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 M_7C_3 carbides in the 7Cr5Mo2V steel led to the hardness drop. And fine secondary V_6C_5 and Mo_2C 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,V_6C_5 grew into micron-sized in length while Mo_2C transformed into spherical Mo_6C. 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.

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