Effect of plastic pre-strain on the fatigue properties of welded joints of X80 LSAW pipes

被引：9
作者：
Xu, Kai [1 ,2 ]
Qiao, Gui-Ying [1 ,2 ,3 ]
Wang, Jun-Si [1 ,2 ]
Li, Hao-Nan [3 ]
Xiao, Fu-Ren [1 ,2 ]
机构：
[1] Yanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China
[2] Yanshan Univ, Coll Mat Sci & Engn, Hebei Key Lab Optimizing Met Prod Technol & Perfo, Qinhuangdao 066004, Hebei, Peoples R China
[3] Yanshan Univ, Sch Environm & Chem Engn, Key Lab Appl Chem Hebei Prov, Qinhuangdao 066004, Hebei, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 139卷
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
X80 pipeline steel; Plastic pre-strained; Fatigue crack; Dislocation; CRACK GROWTH-BEHAVIOR; PIPELINE-STEEL; MECHANICAL-PROPERTIES; CYCLIC DEFORMATION; DISLOCATION DENSITY; DAMAGE ACCUMULATION; SLIP PLANE; INITIATION; STRENGTH; TITANIUM;
D O I：
10.1016/j.ijfatigue.2020.105788
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The fatigue properties of the original, 1%, 2%, and 3% plastic pre-strained welded joints of X80 pipeline steels were tested to find the effect of plastic deformation on the service of pipelines. Results showed that the fatigue cracks growth period remarkably decreased with the increasing plastic pre-straining extent, reducing the safety of pipeline transportation. The decrease was caused by the cleavage fractures generated by dislocation synthesis reactions during the fatigue process. The results reveal the effects of dislocation distribution on fatigue property of the welded pipe after plastic deformation and provide a reference for the safety design of pipelines.
引用
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页数：10
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