摘要
采用光学显微镜、扫描电镜、透射电镜观察和拉伸、冲击试验等方法,研究了国产T23钢在600℃时效时的组织变化和力学性能。结果表明,T23钢在600℃时效时随着时效时间的延长,T23钢中M23C6型碳化物不断粗化,粒状贝氏体形貌逐渐退化。时效时间较短时,主要是M23C6型碳化物粗化引起T23钢力学性能下降;时效时间较长时,主要是粒状贝氏体形貌的变化导致T23钢力学性能下降,同时,M23C6的球化及其向M6C的转变、亚晶的形成和W、Mo固溶强化的降低加快了T23钢力学性能的下降。
Microstructure evolution and mechanical properties of domestic T23 steel aged at 600℃ were investigated by OM, SEM ,TEM and the test of extension and impaction. The results show that M23C6 carbides of T23 steel coarsen and granular bainite pattern degrades gradually as the prolongation of aging time. The mechanical properties degradation is due to the coarsening of M23C6 carbide during short-term aging, and the change of granular bainite pattern during longterm aging. The spheroidization M23 C6 , the transformation of M23 C6 to M6C, the formation of subgrains and the decrease of W and Mo solution strengthening accelerate the mechanical properties degradation during long-time aging.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2007年第9期21-26,共6页
Heat Treatment of Metals
基金
上海市科学技术委员会基金项目(035211025)
上海市教委发展基金
关键词
T23钢
高温时效
组织
力学性能
T23 steel
high temperature aging
microstructure
mechanical properties
