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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3 000 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。
Abstract：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 3 000 mg/L,the diffusion time decreases from 350 h to 27 h. The design of high-pressure 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.
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基本信息:
DOI：10.20242/j.issn.2097-5384.2025.02.006
中图分类号:TK91;TG407
引用信息:
[1]张树坤,王志坤,吕加华,等.输氢管道焊接接头及缺陷处氢扩散机制的仿真模拟研究[J].有色金属(中英文),2025,15(02):225-230.DOI:10.20242/j.issn.2097-5384.2025.02.006.
基金信息:
国家自然科学基金资助项目（52204066）~~