交直流干扰下X80管线钢的腐蚀疲劳裂纹扩展行为研究
Study on Corrosion Fatigue Crack Propagation Behavior of X80 Pipeline Steel under AC and DC Interference
DOI: 10.12677/met.2026.153034, PDF,   
作者: 叶家凡, 刘文黎：成都工贸职业技术学院机械工程学院，四川 成都；靳军军：西南交通大学材料科学与工程学院，四川 成都
关键词: X80管线钢；腐蚀疲劳；交直流干扰；氢脆；裂纹扩展；焊接接头；X80 Pipeline Steel； Corrosion Fatigue； AC and DC Interference； Hydrogen Embrittlement； Crack Propagation； Welded Joints
摘要: 本文针对X80高钢级管线钢在含氢环境下的氢脆与腐蚀疲劳问题，研究了交、直流电流干扰对其疲劳裂纹扩展行为的影响机制。通过原位电化学充氢方法，对X80管线钢母材及焊接接头进行了单边缺口低周疲劳试验，并结合扫描电子显微镜(SEM)和电子背散射衍射(EBSD)技术，系统分析了断口形貌、裂纹扩展路径及微观组织演变。结果表明：在无干扰条件下，焊接接头因针状铁素体组织而表现出优于母材的疲劳性能，裂纹呈沿晶扩展。直流充氢(5 mA/cm2)显著加速裂纹扩展，导致脆性穿晶断裂，严重降低疲劳寿命。交流充氢同样降低疲劳性能，但影响弱于直流充氢；其损伤机制为阳极溶解与阴极充氢的叠加，在断口上同时观察到腐蚀产物与脆性特征，且随电流密度增加，阴极充氢效应增强。本研究揭示了交直流干扰下管线钢的损伤机理差异，为评估埋地管道在杂散电流干扰下的服役安全性提供了实验依据。
Abstract: This paper investigates the mechanisms of fatigue crack propagation in X80 high-grade pipeline steel and its welded joints under alternating current (AC) and direct current (DC) interference in hydrogen-containing environments. Low-cycle fatigue tests on single-edge-notched specimens were conducted coupled with in-situ electrochemical hydrogen charging. The fracture morphology, crack propagation paths, and microstructural evolution were systematically analyzed using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results indicate that under interference-free conditions, the welded joint exhibits superior fatigue performance compared to the base metal due to its acicular ferrite microstructure, with cracks propagating intergranularly. DC charging (5 mA/cm2) significantly accelerates crack growth, leading to brittle transgranular fracture and a severe reduction in fatigue life. AC charging also degrades fatigue performance, but to a lesser extent than DC. The damage mechanism under AC interference is a superposition of anodic dissolution and cathodic hydrogen charging, with both corrosion products and brittle features observed on fracture surfaces. The cathodic hydrogen effect becomes more dominant with increasing current density. This study elucidates the differential damage mechanisms under AC/DC interference, providing experimental basis for assessing the service safety of buried pipelines under stray current interference.
文章引用：叶家凡, 刘文黎, 靳军军. 交直流干扰下X80管线钢的腐蚀疲劳裂纹扩展行为研究[J]. 机械工程与技术, 2026, 15(3): 333-345. https://doi.org/10.12677/met.2026.153034

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