Fracture behavior of thermal aged duplez cast stainless steel for nuclear power plant

摘要：

The impact properties and ductile-brittle transition temperature (DBTT) as well as the fracture mechanism of Z3CN20-09M CSS made in China treated at 400℃ with different accelerated ageing time are investigated by instrumentation impact test and SEM.The results show that one exception is the variation of the yield force Fgy and the other characteristic values of impact force are indistinctively affected by the thermal ageing time range from 0 to 3000h.And except for the energy corresponding to yield force Wgy,all the impact energy parameters decrease with the increment of the thermal ageing time.Moreover,the impact fracture mode of Z3CN20-09M CSS changes from the microvoid coalescence and the dimpled ductile tearing to the quasi-cleavage fracture with the prolong of the thermal ageing time.The tearing ridge and the river pattern of cleavage fracture can be seen in partial areas after the ageing treatment for 3000h.In addition,DBTT of Z3CN20-09M CSS increases with the thermal ageing time.All these indicate that the thermal ageing embrittle-ment occurs in the Z3CN20-09M CSS.

关键词： Duplez cast stainless steel Thermal ageing embrittlement Fracture mechanism Impact properties DBTT

作者: Yuhong Yao Jianfeng Wei Jiangnan Liu Zhengping Wang Yu Wang

作者单位: State Key Laboratory for Mechanical behavior of Materials,Xi an Jiaotong University,Xian,China Sch State Key Laboratory for Mechanical behavior of Materials,Xian Jiaotong University,Xi an,China School of Materials and Chemical Engineering,Xian Technological University,Xian,China

会议类型: 国际会议

会议名称: 国际断裂力学2009年会

会议地点: 成都

会议语种:英文

页码: 151-154

在线出版日期: 2009-10-16（万方平台首次上网日期，不代表论文的发表时间）