邢嘉倪,蔡欣,郑雷刚,胡小强,王秀梅

• 1:沈阳建筑大学材料科学与工程学院
• 2: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、拉伸试验机、冲击试验机等研究了热处理工艺对新型中碳合金钢42CrMo4M组织性能的影响。结果表明，经800～900℃淬火油冷后，42CrMo4M钢的淬火态组织主要为板条马氏体，且随着淬火温度的升高，晶粒尺寸逐渐增大，马氏体板条粗化，在860℃淬火时，晶粒度均匀且硬度最高。经860℃淬火后，在580～700℃回火温度范围内，随着回火温度的升高，42CrMo4M钢中的碳化物由长条状向球形转化，并由马氏体边界处不均匀分布演变为基体中弥散分布；当回火温度达到700℃时，42CrMo4M钢中碳化物明显粗化；随着回火温度的升高，42CrMo4M钢的强度先升高后降低，-20℃低温冲击吸收能量先增大后减小。680℃回火时，42CrMo4M钢的冲击吸收能量达到峰值，为99 J。在试验条件下，42CrMo4M钢经860℃淬火及660～680℃回火后具有良好的综合力学性能。

关键词(KeyWords)： 新型中碳合金钢42CrMo4M;淬火温度;回火温度;力学性能;微观组织

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2020YFB2006800);; 江西省重大科技专项(20194ABC28011);; 扬州市邗江区科技项目(HJZ2020003);; 福建省STS计划配套项目(2021T3019);; 辽宁省教育厅项目(Injc202016)

作者(Author): 邢嘉倪,蔡欣,郑雷刚,胡小强,王秀梅

DOI: 10.13289/j.issn.1009-6264.2021-0581

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