Abstract：It is generally considered that the low-grade steel pipe is the first choice for the actual laying of hydrogen pipeline due to its less hydrogen damage. However, the microstructure change and metallurgical defect of girth weld may significantly increase the hydrogen embrittlement sensitivity. The hydrogen embrittlement sensitivities of the normalized girth weld of L245 pipeline steel in air and 4 MPa hydrogen were compared through slow tensile test of the smooth and notched samples. The microstructure and fracture morphology were systemically characterized and analyzed by the metallographic microscope, scanning electron microscope (SEM) and electron probe microanalyzer (EPMA). The results showed that the hydrogen embrittlement sensitivity of the girth weld of L245 pipeline steel under 4 MPa hydrogen environment increased significantly when there was stress concentration in the microstructure, leading to hydrogen damage. As a result, the slow tensile fracture mode changed from ductile fracture to quasi-cleavage and ductile fracture. Moreover, there were a large number of annular cracks along the notch edge. The ferrite/acicular ferrite phase interface in the L245 girth weld structure acted as a hydrogen trap could accelerate the permeation of hydrogen. At the same time, the presence of carbon segregation would also lead to hydrogen enrichment, resulting in a large number of cracks on the surface of the slow tensile fracture.
高晋, 李拔, 宋卫臣, 汪兵, 付国强, 刘清友. L245管线钢环焊缝在4 MPa氢气环境中的氢脆敏感性探讨[J]. 冶金分析, 2023, 43(9): 86-94.
GAO Jin, LI Ba, SONG Weichen, WANG Bing, FU Guoqiang, LIU Qingyou. Discussion on hydrogen embrittlement sensitivity of girth weld of L245 pipeline steel under 4 MPa hydrogen environment. , 2023, 43(9): 86-94.
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