刘国亮,唐梦兰,李栋,刘勇,仝大明,刘庆冬

• 1:中国航发中传机械有限公司技术中心
• 2:上海交通大学材料科学与工程学院

摘要(Abstract)：

用光学显微镜、扫描电镜、透射电镜和显微硬度研究了回火温度和时间对42CrMo钢显微组织和硬度的影响,并推导获得了回火后屈服强度的计算模型。结果表明:随着回火温度的升高和时间的延长,马氏体的板条界面逐渐模糊或消失,板条宽度增加,位错密度显著减少,析出相由针状的过渡性碳化物逐渐向球形的稳定渗碳体转变,显微组织从回火马氏体演变为碳化物弥散分布的回火屈氏体(400℃)和索氏体(600℃),同时硬度不断降低,且在前2 h回火内降低显著,而后趋于稳定。由于扩散控制的回火组织演变类同于单一相变过程,基于JMAK方程建立的强度计算模型,可以较好地预测42CrMo钢在200～600℃回火时的屈服强度变化。

关键词(KeyWords)： 42CrMo钢;回火;显微组织;屈服强度

Abstract:

Keywords:

基金项目(Foundation): 上海交通大学青年人才科研能力培育专项(19X100040016)

作者(Author): 刘国亮,唐梦兰,李栋,刘勇,仝大明,刘庆冬

DOI: 10.13289/j.issn.1009-6264.2019-0518

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