Creep Life Assessment of Longitudinal Welded Pipe of Grade 91 Steel
An internal pressure creep test has been conducted ASME Grade 91 type steel longitudinal welded pipe at 650℃ to clarify type Ⅳ failure behavior of actual pipes.The creep test was interrupted to measure hardness and voids density at HAZ region of outer surface of the test pipe.Results of the measure of the hardness and voids density did not indicate creep damage accumulation.The welded pipe suddenly ruptured with large deformation.Type Ⅳ cracking occurred in the longitudinal welded portion of the test pipe.To evaluate the stress/strain distribution in the welded portions, creep analysis was conducted on the test pipe.After stress redistribution due to creep deformation,stress and strain concentrations were observed inside the HAZ region.Then, authors creep life prediction model was applied to the creep test result to examine its validity to actual size pipe.It was demonstrated that the life prediction model can be applicable to the test results of Grade 91 steel longitudinal welded pipe with sound accuracy.
Creep life assessment Welded Joint Grade 91 steel Internal pressure test
Masatsugu Yaguchi Takayuki Sakai
Materials Science Research Laboratory, Central Research Institute of Electric Power Industry 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan
国际会议
长沙
英文
182-187
2016-10-16（万方平台首次上网日期，不代表论文的发表时间）