660MW超临界机组T91钢焊接接头断裂失效分析  

Fracture Failure Analysis on T91 Steel Welded Joint of 660MW Supercritical Units

作　　者：孙涛[1] 徐雪霞[1] 张晓昱[1] 孙澎[1] 

机构地区：[1]河北省电力研究院,河北石家庄050021

出　　处：《热加工工艺》2012年第1期163-164,167,共3页Hot Working Technology

摘　　要：通过化学成分分析、硬度检验、金相组织检验和断口分析,对某电站T91钢焊接接头断裂失效原因进行了分析。结果表明,由于该焊接接头焊后热处理效果不良,导致焊缝热影响区力学性能未能通过焊后热处理得到改善,并最终发生脆性断裂失效。Failure causes on T91 steel welded joint of 660MW supercritical units was analyzed by chemical composition,hardness test,metallurgical structure and fracture morphology observation.The results show that the effect of postweld heat treatment is not good,and the mechanical properties of HAZ are not improved by postweld heat treatment,which cause the brittle fracture failure of the welded joint.

关 键 词：T91钢 焊后热处理 脆性断裂失效 

分 类 号：TG406[金属学及工艺—焊接]