Experiment on hydrogen embrittlement sensitivity of L245 pipeline steel girth weld with different stress concentration factors
SONG Weichen1, HU Songyan2, CHENG Guangxu*2, WANG Bing3, HU Haijun2, TU Shengwen2
1. Sinopec Petroleum Engineering Corporation,Dongying 257000,China; 2. School of Chemical Engineering and Technology, Xi′an Jiaotong University,Xi′an 710049,China; 3. Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China
Abstract：The welding of pipe girth weld will cause the change of microstructure and mechanical property, and it usually inevitably leads to welding imperfection. Hydrogen atoms can be aggregated in the region of stress concentration formed by welding imperfection, which will enhance the hydrogen embrittlement sensitivity of material. In this study, L245 hydrogen transport pipeline steel was selected. The girth weld notch tension samples were tested at slow strain rate under 6.3 MPa hydrogen and nitrogen environments. The hydrogen embrittlement sensitivity change law of weld metal with different stress concentration factors was investigated. Moreover, the microstructure of fracture was characterized and analyzed by scanning electron microscope (SEM). The results showed that the hydrogen embrittlement sensitivity of weld metal did not monotonically increase with the increase of stress concentration factor. When the stress concentration factor increased to a certain value, the hydrogen embrittlement sensitivity decreased instead. The concept of transition stress concentration factor (Ktt) based on the tests was proposed. The critical stress concentration factor (Kct) was defined, which was important for the establishment of engineering judgment standard of welding imperfection in the laying construction of hydrogen transport pipes.
宋卫臣, 胡松岩, 程光旭, 汪兵, 胡海军, 涂圣文. L245管线钢环焊缝不同应力集中系数缺口氢脆敏感性实验[J]. 冶金分析, 2024, 44(9): 91-98.
SONG Weichen, HU Songyan, CHENG Guangxu, WANG Bing, HU Haijun, TU Shengwen. Experiment on hydrogen embrittlement sensitivity of L245 pipeline steel girth weld with different stress concentration factors. , 2024, 44(9): 91-98.
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