摘要
研究了3种碳含量(0.22C、0.34C、0.45C)的贝氏体钢在960℃奥氏体化+Ms点以上10~50℃等温淬火工艺下碳含量对贝氏体组织转变和力学性能的影响。结果表明,3种试验钢经过等温淬火处理后均获得由贝氏体铁素体和残留奥氏体相间分布组成的无碳化物贝氏体组织;随着碳含量的降低,贝氏体相变时间显著缩短,贝氏体铁素体板条变厚,硬度和抗拉强度呈下降趋势,但冲击性能显著提高,这主要是与低碳钢贝氏体转变温度更高,贝氏体铁素体板条粗大但高碳含量的大块状残留奥氏体减少有关。
Effect of carbon content on microstructure transformation and mechanical properties of bainitic steels with different carbon contents(0.22C,0.34C and 0.45C)was studied after austenitizing at 960℃and then austempering at above Ms point 10-50℃.The results show that the carbide-free bainite microstructure composing of bainite ferrite and retained austenite is obtained after austempering.With the decrease of carbon content,the bainite transformation time is significantly shortened,the bainitic ferrite laths become thicker,and the hardness and tensile strength show a downward trend,while the impact property is obviously improved,which is mainly related to the higher bainite transformation temperture of the low carbon steel,the thick bainitic ferrite laths and the decrease of high carbon blocky retained austenite.
作者
郝晓歌
赵雷杰
王艳辉
马鹏辉
张孜
岳赟
熊鹏
Hao Xiaoge;Zhao Leijie;Wang Yanhui;Ma Penghui;Zhang Zi;Yue Yun;Xiong Peng(School of Mechanical and Equipment Engineering,Hebei University of Engineering,Handan Hebei 056038,China;National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology,Luoyang Henan 471023,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第1期46-51,共6页
Heat Treatment of Metals
基金
河北省自然科学基金(E2020402101)
河北省高等学校科学技术研究项目(QN2020136,QN2019184,BJ2021012)
高端轴承摩擦学技术与应用国家地方联合工程实验室开放基金(202108)。
关键词
贝氏体钢
碳含量
无碳化物贝氏体
力学性能
残留奥氏体
bainitic steel
carbon content
carbide-free bainite
mechanical properties
retained austenite
