张进峰,吴晓春,闵娜

• 1:上海大学材料科学与工程学院
• 2:上海市钢铁冶金新技术开发应用重点实验室
• 3:高品质特殊钢冶金与制备国家重点实验室
• 4:苏州市职业大学电子信息工程学院

摘要(Abstract)：

采用原位电阻法,并结合硬度测量、微观组织分析技术对SDCM1新型热作模具钢从室温至590℃回火过程中的碳原子扩散行为进行了研究。结果表明:在80℃至125℃回火时,试验钢的电阻偏离线性出现下降趋势,同时硬度出现峰值,这主要是由于碳原子向位错扩散所致,其激活能为83 kJ·mol~(-1);180～250℃回火时,电阻偏离线性略微降低,归因于ε碳化物的形核;300℃以上回火时,电阻随温度升高增势减缓,结合透射电镜(TEM)分析,这主要是由于碳化物的析出所致,通过电阻的不同演化趋势可以判断碳化物和合金碳化物的析出差异;温度升高至590℃等温时,试验钢的电阻急剧下降,这主要是由于等温碳化物的大量析出所致。研究表明电阻法可以清晰表征模具钢的回火过程中碳原子运动、占位及组织演化特征与动力学过程,是一种有效的研究手段。

关键词(KeyWords)： 热作模具钢;碳扩散;电阻;偏聚;析出

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2016YFB0300400);; 苏州市职业大学科研平台(201804000050)

作者(Author): 张进峰,吴晓春,闵娜

DOI: 10.13289/j.issn.1009-6264.2020-0445

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