输氢管道焊接接头及缺陷处氢扩散机制的仿真模拟研究  

Numerical Simulation Study on Hydrogen Diffusion Mechanism at Welding Joints and Defects in Hydrogen Pipeline

作　　者：张树坤 王志坤[2] 吕加华 宋卫臣[3] ZHANG Shukun;WANG Zhikun;LÜJiahua;SONG Weichen(Sinopec Jianghan Oil Construction Engineering Corporation,Qianjiang 433111,China;China University of Petroleum(East China),Qingdao 266580,China;Sinopec Petroleum Engineering Corporation,Dongying 257026,China)

机构地区：[1]中石化江汉油建工程有限公司,湖北潜江433111 [2]中国石油大学(华东),山东青岛266580 [3]中石化石油工程设计有限公司,山东东营257026

出　　处：《有色金属(中英文)》2025年第2期225-230,共6页Nonferrous Metals

基　　金：国家自然科学基金资助项目(52204066)。

摘　　要：通过详细的模拟分析,研究了X80钢焊接接头中的氢扩散特性及其与温度的关系。研究表明,氢原子的扩散速率随温度升高而增加,25℃时为0.002 mg·L^(−1)·h^(−1),500℃时达0.015 mg·L^(−1)·h^(−1)。焊缝区氢浓度远高于基体,温度管理至关重要。氢扩散还受微观结构影响,高浓度下扩散速度显著加快,如氢浓度从10 mg/L到3000 mg/L时,扩散时间由350 h减至27 h。高压输氢管道设计需考虑焊缝微观结构和氢管理。裂纹或气孔中氢压引发的应力变化促进氢扩散,裂纹尖端氢浓度高,与残余应力分布一致。研究结果为高压输氢管道设计和运行中的温度管理和结构完整性提供了重要见解。This article investigated the hydrogen diffusion characteristics in X80 steel welded joints and their relationship with temperature through detailed simulation analysis.The results show that the diffusion rate of hydrogen atoms increases with temperature,reaching 0.002 mg·L^(−1)·h^(−1)at 25℃and 0.015 mg·L^(−1)·h^(−1)at 500℃.The hydrogen concentration in the weld zone is much higher than that in the matrix,and temperature management is crucial.Hydrogen diffusion is also influenced by microstructure,with the diffusion rate significantly accelerating at high concentrations.For example,when the hydrogen concentration increases from 10 mg/L to 3000 mg/L,the diffusion time decreases from 350 h to 27 h.The design of highpressure hydrogen transmission pipelines needs to consider the microstructure of welds and hydrogen management.The stress changes caused by hydrogen pressure in cracks or pores promote hydrogen diffusion,and the hydrogen concentration at the crack tip is elevated,consistent with the distribution of residual stress.These findings provide important insights into the temperature management and structural integrity in the design and operation of high-pressure hydrogen pipelines.

关 键 词：氢扩散 焊接接头 缺陷 ABAQUS X80钢 

分 类 号：TE973[石油与天然气工程—石油机械设备] TG457.11[金属学及工艺—焊接] TG156