张留军,宋肖阳,刘玉庆,张心金,朱琳,何毅,董治中

• 1:中国第一重型机械集团天津重型装备工程研究有限公司
• 2:山东特种设备检验所
• 3:天津理工大学材料科学与工程学院

摘要(Abstract)：

采用光学显微镜(OM)和扫描电镜(SEM)研究了不同正火和回火温度下改性AISI 4140钢的显微组织,采用透射电镜(TEM)和选区电子衍射(SAED)观察分析了其碳化物的类型、尺寸和形态,还对改性AISI 4140钢的硬度、拉伸性能、冲击韧性进行了测试。结果表明:在850～900℃的正火处理过程中,随着正火温度的升高,平均晶粒尺寸保持在14μm左右;当正火温度达到925℃时,平均晶粒尺寸达到20μm以上,导致力学性能下降;马氏体硬度随正火温度的升高先升高后下降,880℃时达到最大值497 HV10;随着回火温度的升高(580～620℃),实验钢中的M_3C碳化物变短、变厚,屈服强度从1044 MPa下降到855 MPa,冲击韧性(-18℃)从55 J提高到108 J,这是由于位错密度较低及析出物较多导致的。

关键词(KeyWords)： AISI 4140钢;碳化物;热处理工艺;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 天津市科技计划项目(17YFZCGX00900)

作者(Author): 张留军,宋肖阳,刘玉庆,张心金,朱琳,何毅,董治中

DOI: 10.13289/j.issn.1009-6264.2018-0445

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