文献类型：会议论文

英文题名：Tempering embrittlement of 2.25Cr-1Mo steel for, a long term of service

作者：Hua, L; Xu, H; Wang, ZW; Wang, ZD

机构：[1]E China Univ Sci & Technol, Shanghai 200237, Peoples R China

会议论文集：Fracture Mechanics Symposium

会议日期：SEP 09-12, 2004

会议地点：Huangshan, PEOPLES R CHINA

语种：英文

外文关键词：tempering embrittlement; hydrogen induced cracking; impurity segregation; intergranular fracture

摘要：The microstructures and mechanical properties are investigated in this paper for a hydrogenation reactor steel 2.25Cr-1Mo after long-term service. The material exposed at 427 degreesC for 10 years as a testing block in reactor vessel show appreciable temper embrittlement. The fracture toughness K(IC) at room temperature is lower because of tempering situation and hydrogen absorption. Coarse grain and impurity segregation at grain boundary are observed from micrography. The results show that fracture mode changes from quasi-cleavage to intergranular when temper embrittlement becomes more serious. It also shows that the ratio of intergranular fracture-to transgranular fracture will be bigger after cathodical hydrogen charging.