Microstructure and Mechanical Properties of Simulated Heat-affected Zones of EP-823 Steel for ADS/LFR
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第8期
论文作者：Shanping Lu Tian Liang Yongkui Li Dianzhong Li Lijian Rong Yiyi Li
文章页码：864 - 871
摘 要：EP-823 steel is one of the candidate materials for accelerator-driven systems/lead-cooled fast reactors（ADS/LFR）.Its weldability was investigated by mechanical property tests and microstructure analysis on the enlarged heat-affected zones（HAZs） made by numerical and physical simulation.The finite element numerical simulation could simulate the welding thermal cycle of the characteristic regions in HAZs with extremely high accuracy.The physical simulation performed on a Gleeble simulator could enlarge the characteristic regions to easily investigate the relationship between the microstructure evolution and the mechanical properties of the HAZs.The results showed that the simulated partially normalized zone comprising tempered martensite,newly formed martensite and more tiny carbides has the highest impact energy.The fully normalized zone exhibits the highest hardness because of the quenched martensite and large carbides.The ductile property of the overheated zone is poor for the residual deltaferrite phases and the quenched martensite.
Shanping Lu1,2，Tian Liang2，Yongkui Li1，Dianzhong Li1，Lijian Rong2，Yiyi Li2
1. Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences2. Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences
摘 要：EP-823 steel is one of the candidate materials for accelerator-driven systems/lead-cooled fast reactors（ADS/LFR）.Its weldability was investigated by mechanical property tests and microstructure analysis on the enlarged heat-affected zones（HAZs） made by numerical and physical simulation.The finite element numerical simulation could simulate the welding thermal cycle of the characteristic regions in HAZs with extremely high accuracy.The physical simulation performed on a Gleeble simulator could enlarge the characteristic regions to easily investigate the relationship between the microstructure evolution and the mechanical properties of the HAZs.The results showed that the simulated partially normalized zone comprising tempered martensite,newly formed martensite and more tiny carbides has the highest impact energy.The fully normalized zone exhibits the highest hardness because of the quenched martensite and large carbides.The ductile property of the overheated zone is poor for the residual deltaferrite phases and the quenched martensite.
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