摘要
通过热膨胀试验研究实验钢的等温转变动力学,采用盐浴等温淬火工艺制备超细贝氏体组织,利用扫描电镜、透射电镜和X射线衍射仪定量分析工艺参数对微观组织结构的影响.结果显示:实验钢室温组织由大量超细板条状贝氏体铁素体和板条间分布的薄膜状奥氏体的复相组织构成,210℃等温淬火得到的贝氏体板条间距细化到约60 nm,硬度约为HBW610;实验钢的最终组织特征取决于发生贝氏体转变的等温温度和等温时间,等温温度越低时贝氏体转变完成需要的等温时间越长.
The isothermal transformation kinetics of experimental steel was studied by the thermal expansion method. Uhrafine bainite was obtained by austempering at low temperature. The microstructure was quantificationally analyzed by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The results show that microstructure of the experimental steel is composed of a large number of uhrafine lath bainite ferrite and thin film austenite. The spacing of the bainitic lath is about 60 nm and the hardness is about HBW 610 by austempering at 210 %. The final microstructure and properties depend on the temperature and holding time for austempering. The holding time for fully transformed bainite increases at a lower austempering temperature.
出处
《工程科学学报》
EI
CSCD
北大核心
2016年第12期1741-1746,共6页
Chinese Journal of Engineering
基金
中国高技术研究发展计划资助项目(2012AA03A508)
自然科学基金资助项目(51474031)
中央高校基本科研业务费资助项目(FRF-UM-15-001)
关键词
钢热处理
等温淬火
贝氏体
组织演变
定量分析
steel heat treatment
austempering
bainite
microstructural evolution
quantitative analysis
