Fatigue behavior of X65 pipeline steel welded joints prepared by CMT/ GMAW backing process

被引：14
作者：
Han, Yongdian [1 ,2 ]
Zhong, Shifang [1 ,2 ]
Peng, Chentao [1 ,2 ]
Tian, Lei [3 ]
Sun, Youhui [4 ]
Zhao, Lei [1 ,2 ]
Xu, Lianyong [1 ,2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China
[2] Tianjin Key Lab Adv Joining Technol, Tianjin 300350, Peoples R China
[3] Offshore Oil Engn Qingdao Co Ltd, Qingdao 266520, Peoples R China
[4] Offshore Oil Engn Co Ltd, Tianjin 300461, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2022年 / 164卷
基金：
中国国家自然科学基金;
关键词：
X65 pipeline steel; Fatigue behavior; Welded joints; Microstructure; Cold metal transfer (CMT); HEAT-AFFECTED ZONE; MICROSTRUCTURE; LIFE;
D O I：
10.1016/j.ijfatigue.2022.107156
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The fatigue behavior of X65 welded joints with cold metal transfer (CMT) backing process and gas metal arc welding (GMAW) backing process has been studied in comparison. The fatigue life of CMT-joints is improved by about 67% due to the combined effect of the low stress concentration in weld root and CMT-produced micro-structure. Furthermore, the homogeneously distributed acicular ferrite and grain boundary ferrite arrested crack propagation and increased the fatigue propagation life of CMT-joints, but the necklace-type martensite/austenite constituents and lath bainite would reduce fatigue crack initiation and propagation life of GMAW-joints.
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页数：14
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