电焊机2025，Vol.55Issue(7)：97-105,9.DOI:10.7512/j.issn.1001-2303.2025.07.10
X52管线钢TIG焊接接头氢脆敏感性研究
Research on Hydrogen Embrittlement Susceptibility of X52 Pipeline Steel Welded Joints by TIG Welding
摘要
Abstract
To clarify the differences in hydrogen embrittlement sensitivity in different regions of X52 pipeline steel TIG welding joints,systematic research was conducted using methods such as electrochemical hydrogen charging combined with tensile tests,microstructure characterization,and hydrogen permeation testing.The results show that after hydrogen charg-ing,there is no significant change in the strength of each region of the joint,but the plasticity significantly decreases.Among them,the elongation rate of the weld bead decreased the most(48.6%after 15 h of hydrogen charging),followed by the heat-affected zone(48.3%),and the base material the least(26.1%).Microstructure analysis shows that the weld bead is mainly composed of acicular ferrite and M/A components,has a higher dislocation density,and contains a larger number and size of Al2O3 inclusions(3～6 μm).Hydrogen permeation test results show that the hydrogen diffusion coefficient of the weld bead is the lowest(Deff=4.06×10-6 cm2·s-1)and the hydrogen trap density is the highest(N=8.01×10-5 mol·cm-3),indicating that hydrogen atoms are more likely to accumulate in this area and induce hydrogen-induced cracking.Fracture analysis shows that the fracture mode of hydrogen-charged samples is mainly quasi-cleavage brittle fracture,and the crack sources are mostly around inclusions,showing a"fisheye"characteristic morphology.Comprehensive analysis shows that in the TIG welding joint of X52 pipeline steel,the weld bead is the most sensitive area to hydrogen embrittlement,followed by the heat-affected zone and the base material.This study reveals the intrinsic relationship between the different hydrogen embrittle-ment behaviors in different regions of the welding joint and its microstructure and hydrogen trap distribution,providing ex-perimental evidence for the safety assessment of pipeline steel welding structures under hydrogen transport environments.关键词
X52管线钢/TIG焊接接头/氢脆敏感性/氢陷阱/夹杂物/断口特征Key words
X52 pipeline steel/TIG welding joint/hydrogen embrittlement susceptibility/hydrogen trapping/inclusions/fracture feature分类
矿业与冶金引用本文复制引用
王和平,王磊,韩学,赵红波,张锦刚,毕宗岳,张敏,毛威..X52管线钢TIG焊接接头氢脆敏感性研究[J].电焊机,2025,55(7):97-105,9.基金项目
中国石油天然气股份有限公司基础性前瞻性科技专项(2023ZZ1207) （2023ZZ1207）
陕西省重点研发计划(2023KXJ-234) （2023KXJ-234）
西安市科技计划项目(23KGDW0004-2022) （23KGDW0004-2022）
国家石油天然气管材工程技术研究中心开放课题(KFKT2024-3) （KFKT2024-3）
