Aging Precipitates and Strengthening Mechanism of T122 Boiler Steel  

作　　者：BAO Han-sheng CHENG Shi-chang LIU Zheng-dong TAN Shu-ping 

机构地区：[1]Institute of Structure Materials, Central Iron and Steel Research Institute, Beijing 100081, China [2]School of Astronautics, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China

出　　处：《Journal of Iron and Steel Research International》2010年第2期67-73,共7页

基　　金：Item Sponsored by National Hi-Tech Research and Development Program of China (863 program) (2006AA03Z513)

摘　　要：T122 steel has been used to produce superheater or reheater of ultra supercritical boilers. With the help of chemical phase extraction and mierostructure characterization, the performance of aging precipitates of T122 steel, such as M23C6 carbide, Laves phase and MX phase was investigated, the strengthening mechanism of the steel was discussed, and the thermal yield stress of lath substructure, dislocations and precipitates of the steel were calculated. It was found that lath substructure and dislocations dominated the strengthening attribution and precipitation hardening went second to the strengthening attribution.T122 steel has been used to produce superheater or reheater of ultra supercritical boilers. With the help of chemical phase extraction and mierostructure characterization, the performance of aging precipitates of T122 steel, such as M23C6 carbide, Laves phase and MX phase was investigated, the strengthening mechanism of the steel was discussed, and the thermal yield stress of lath substructure, dislocations and precipitates of the steel were calculated. It was found that lath substructure and dislocations dominated the strengthening attribution and precipitation hardening went second to the strengthening attribution.

关 键 词：T122 heat resistant steel strengthening PRECIPITATE SUBSTRUCTURE DISLOCATION 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TK223.1[金属学及工艺—金属材料]