Fracture Toughness of Different Locations in API X80 Pipeline Steel on Low Constraint SENT Specimens
With the considerable use of high-grade pipeline steel in onshore and offshore project,welded joints are recognized as the weak link in pipeline because of the non-uniform microstructural regions induced by welding heat input.In this paper we investigated the J-R curve in different locations of API X80 pipeline welded joints through low constraint SENT specimens with side grooves at room temperature.The effect of notch orientation (longitudinal-radial (L-R) and transverse-radial (T-R)) on resistance curve were investigated in base metal.As the welded joints adopted in this study is two-pass steel arc welds,so the J-R curves of the inner surface,the outer surface and through-thickness surface notches specimens in the weld metal were investigated.The inner surface sample have the highest toughness through three samples because of the effect of second pass welding process.The effect of constraint on resistance curve was conduct between low constraint SENT specimen and high constraint SENB specimen,which found that the lower constraint corresponding to the higher resistance curve.After finishing the test,crack advancing plan of different positions were etched and observed by OM to demonstrate that the crack path always in the region which we would like to test.
Fracture toughness X80 pipeline steel J-resistance clamped SENT
Hongsheng Lu Yonghe Yang Gang Chen Xu Chen Xin Wang
School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,P.R.China School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,P.R.China;PetroChina School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,P.R.China;Department
国际会议
2016 International Symposium on Structural Integrity，ISSI—2016(2016国际结构完整性研讨会)
天津
英文
251-255
2016-05-26（万方平台首次上网日期，不代表论文的发表时间）