锻压技术

淬火温度对改型Cr8Mo2VSi模具钢组织与硬度的影响

英文标题：Influence of quenching temperature on microstructure and hardness for modified Cr8Mo2VSi die steel

分类号：TG142.14

出版年,卷(期):页码：2021,46(10):196-202

摘要：

以含W的改型Cr8Mo2VSi冷作模具钢为研究对象，通过金相、SEM、EDS、XRD和硬度等试验，研究并分析了不同淬火温度对其显微组织、残余奥氏体含量及硬度的影响。试验结果表明：热处理后样品的组织主要为回火马氏体、少量残余奥氏体和共晶碳化物，其一次碳化物中含有较多的W，同时Cr、Mo、V、C等元素大量富集于大颗粒共晶碳化物中，而贫于马氏体基体中；由成分比例推断共晶碳化物类型为Cr7C3型碳化物和少量VC型、Fe21Mo2C6型或Fe21W2C6型碳化物，较高淬火温度更有利于M23C6型碳化物的析出；改型Cr8Mo2VSi模具钢在较高淬火温度下的组织中含有较多的残余奥氏体，最终回火后的硬度也较高。

For modified Cr8Mo2VSi cold work die steel containing W, the influences of different quenching temperatures on the microstructure, residual austenite content and hardness were studied and analyzed by metallograph, SEM, EDS, XRD and hardness tests. The results show that the microstructure of samples after heat treatment is mainly tempered martensite, a small amount of residual austenite and eutectic carbide. The primary carbide contains more W, while Cr, Mo, V, C and other elements are enriched in large eutectic carbide, but are poor in martensite matrix. According to the composition ratio, the eutectic carbide types are Cr7C3 type carbide and a small amount of VC type, Fe21Mo2C6 type or Fe21W2C6 type carbide, and the higher quenching temperature is more beneficial to the precipitation of M23C6 type carbide. In addition, the microstructure of Cr8Mo2VSi die steel at higher quenching temperature contains more residual austenite, and the hardness after the final tempering is also higher.

基金项目：

重要工业原材料（模具钢材产品）质量国际比对研究；模具钢（S136）在典型热处理前后特征指标定量分析及变化规律研究；国家教师科研基金十二五规划（CTF120702）

作者简介：孙康彬（1997-），男，硕士研究生 E-mail：599464428@qq.com 通信作者：黄历锋（1980-），男，博士，副教授 E-mail：hlf@gddqt.com

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