焊管2025，Vol.48Issue(5)：18-26,9.DOI:10.19291/j.cnki.1001-3938.2025.05.003
电化学充氢对不同焊接工艺下管线钢焊接接头氢脆敏感性研究
Research on Hydrogen Embrittlement Susceptibility of Pipeline Steel Joints in Different Welding Processes under Electrochemical Hydrogen Charging
摘要
Abstract
The welds of three different welding processes,namely submerged arc welding(SAW),highfrequency resistance welding(HFW)and tungsten inert gas welding(TIG)with X52 as the base metal,were taken as the research objects.The effects of hydrogen prefilling time of 15 h on the hydrogen embrittlement sensitivity of welds from different welded joints were explored by electrochemical hydrogen prefilling,microstructure characterization,and mechanical property testing,combined with an analysis of the degree of degradation in mechanical properties and microstructure.The results showed that the mechanical properties of the three welds decreased after 15 h of hydrogen filling time.The sensitivity to hydrogen embrittlement,in descending order,is HFW weld(12.8%),SAW internal weld(13.6%),base metal(26.2%),SAW external weld(29.8%),and TIG weld(36.5%).The hydrogen embrittlement sensitivity EI index for SAW external weld and base metal BM was 29.8%and 26.2%,respectively;meanwhile,the maximum EI for TIG weld reached 36.5%.Further analysis showed that fractures of the three welds before hydrogen filling exhibited ductile fractures due to microporous aggregation mechanisms;however,post-hydrogen charging resulted in brittle fractures where large-size inclusion particles such as alumina and manganese oxide became fracture sources.The polygonal ferrite in the SAW inner weld makes crack initiation and propagation difficultwhich effectively reduce susceptibility to embrittlement;additionally,small-sized inclusion interface in the SAW inner weld can provide attachment points for hydrogen to some extent.Furthermore,the polygonal ferrite structure of HFW weld can passivate crack tips to prevent further expansion while mitigating local hydrogen accumulation that could lead to excessive hydrogen pressure,delaying crack propagation,and alleviating hydrogen embrittlementeffectively.Needle-like ferrite is mainly con-tained in SAW external welds and TIG weldswhich usually exhibit high strength and toughnessbut are more sensitive to hydrogen diffusion and aggregation.关键词
X52/SAW/HFW/TIG/氢脆敏感性/氢损伤Key words
X52/SAW/HFW/TIG/hydrogen embrittlement susceptibility/hydrogen damage分类
金属材料引用本文复制引用
王磊,赵红波,刘斌,毕宗岳,张锦刚,张敏,马宏伟..电化学充氢对不同焊接工艺下管线钢焊接接头氢脆敏感性研究[J].焊管,2025,48(5):18-26,9.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"制氢储氢机理、新材料与新方法研究"课题七"管道储输氢基础理论、安全及新材料研究"(项目编号2023ZZ1207) （项目编号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）
