Effect of grain boundary ferrite morphologies on impact toughness of X80 girth weld

被引：3
作者：
Wang, Ce [1 ]
Di, Xinjie [1 ,2 ]
Dai, Lianshuang [3 ]
Duan, Qiyue [1 ]
Han, Jiawei [1 ]
Yang, Xiaocong [1 ]
Cui, Shaohua [3 ]
Li, Chengning [1 ,2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
[2] Tianjin Key Lab Adv Joining Technol, Tianjin 300072, Peoples R China
[3] China Oil & Gas Pipeline Network Corp, Beijing 100013, Peoples R China
来源：
MATERIALS LETTERS | 2024年 / 377卷
基金：
中国国家自然科学基金;
关键词：
Grain boundary ferrite morphologies; Impact toughness; X80 girth weld; Crack; finite element simulation; HEAT-AFFECTED ZONE; FRACTURE-TOUGHNESS; MICROSTRUCTURE; STRENGTH; CONSTITUENTS; INDENTATION; COMBINATION; STEEL;
D O I：
10.1016/j.matlet.2024.137412
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The X80 girth weld microstructure formed by high-strength acicular ferrite and low-strength grain boundary ferrite was studied to investigate the effect of grain boundary ferrite morphologies on impact toughness. The results show that due to the difference in direction of heat loss caused by the narrow groove, the grain boundary ferrite morphology of the weld metal center and the weld metal edge are continuous network structure and parallel layered structure, respectively. The continuous network structure grain boundary ferrite causes strain localization, resulting in the formation of a large number of secondary cracks in the crack propagation process, which seriously deteriorates the toughness.
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页数：4
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