梁雅鑫,蔡欣,郑雷刚,胡小强,李殿中

• 1:中国科学技术大学稀土学院
• 2:中国科学院赣江创新研究院
• 3:中国科学院金属研究所沈阳材料科学国家研究中心

摘要(Abstract)：

借助光学显微镜、扫描电镜、透射电镜和X射线衍射仪等研究了二次回火温度对42CrMo4M钢显微组织、力学性能和残余应力的影响。结果表明：二次回火后，42CrMo4M钢中马氏体板条进一步发生回复和再结晶，位错密度显著降低；长条状碳化物逐渐球化和粗化，转变为颗粒状形貌；随二次回火温度的升高，42CrMo4M钢的屈服强度和抗拉强度呈先上升后大幅下降的趋势，而塑韧性则变化较小。660℃二次回火后，42CrMo4M钢-20℃冲击吸收能量由调质处理后的111 J略微增加至120 J,增幅仅为9 J;此外，随着二次回火温度的升高，42CrMo4M钢中残余应力大致呈先下降后上升的趋势。640℃二次回火后，42CrMo4M钢中残余应力最低，为111.7 MPa,较调质处理后的152.5 MPa,降低了约26.75%。

关键词(KeyWords)： 42CrMo4M钢;二次回火;力学性能;微观组织;残余应力

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2020YFB2006800);; 沈阳市中青年科技创新人才支持计划项目(RC220474);; 福建省科技计划STS配套项目(2021T0319);; 中国科学院战略性科技先导专项(XDC04000000)

作者(Author): 梁雅鑫,蔡欣,郑雷刚,胡小强,李殿中

DOI: 10.13289/j.issn.1009-6264.2023-0018

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