Numerical simulation of hydrogen enrichment induced by welding and heat treatment for X80 steel pipe

doi:10.13251/j.issn.0254-6051.2023.10.044

Abstract

Abstract: In order to explore the influence of post-welding heat treatment on welding residual stress and hydrogen diffusion, a model of X80 girth weld pipe with six layers was established by using Abaqus software, and the coupling analysis of temperature field, stress field and hydrogen diffusion was carried out. The results show that the residual stress generated by welding is mainly concentrated in the weld zone and the heat-affected zone. The peak value of the Mises equivalent stress is 580 MPa, which is closing to the yield strength of the pipe. The distribution of hydrogen concentration in the pipeline metal is different along the radial and axial directions, while the distribution of hydrogen concentration and hydrostatic stress are similar. The post-welding heat treatment of the hydrogen pipeline has an obvious effect on reducing the welding residual stress and hydrostatic stress, thereby reducing the hydrogen enrichment concentration and avoiding probability of occurrence of hydrogen embrittlement at the weld.

Key words: X80 pipeline steel, girth weld, welding residual stress, heat treatment, hydrogen diffusion

CLC Number:

TG457

Xue Jinghong, Bai Chenxu. Numerical simulation of hydrogen enrichment induced by welding and heat treatment for X80 steel pipe[J]. Heat Treatment of Metals, 2023, 48(10): 285-290.

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