The U-notch specimens were used to investigate the fatigue crack initiation life of X60 pipeline steel after pre-tension straining with ductile deformation of 5%, 10% and 15%.

• 摘要采用U型缺口试样研究了X60管线钢经5%25、10%25和15%25的预拉伸应变后的疲劳裂纹形成寿命。