Creep rupture strength of F12 steel welded joint after long-term service
Creep rupture strength of F12 steel welded joint which was used as the main steam pipe and serviced 165000 hours was investigated by using high temperature creep rupture testing.Microstructure analysis results show that the microstructure of F12 steel welded joint F12 e became embrittlement significantly after long-term service.The precipitates mainly consist of M23C6 carbide and Laves phase, and the amount of M23C6 phase is more, which precipitated along the grain boundaries in bulk or chainlike with larger size.At the same time,there are larger inclusions with directional distribution, in which these inclusions have poor bonding with substrate and easily become crack source during the process of high temperature creep.The high temperature enduring strength of welded joint of F12 steel decreased significantly, it is necessary to enhance the examination of the microstructure and life assessment of pipeline in the next overhaul period.
run : F12 steel creep rupture strength precipitated phase
LI Xinmei ZHANG Zhongwen ZOU Yong WEI Yuzhong ZHANG Duqing
State grid shandong electric power research institute, Shandong jinan ,250002, China Key Lab of Liquid Structure and Heredity of Materials, Ministry of Education,Shandong University, Ji Huadian Zouxian electric power Co.Lid., Shandong jining 273522, China
国际会议
北京
英文
452-458
2014-10-11（万方平台首次上网日期，不代表论文的发表时间）