摘要
本研究以Q690D高强钢焊缝为对象,通过电化学阻抗谱(EIS)技术结合微观组织分析与慢应变速率试验(SSRT),系统探究了焊缝不同区域在阴极充氢条件下的EIS响应规律。结果表明:热影响区粗晶区因组织粗大、陷阱密度高,表现出最低的电荷转移电阻和最高的氢致开裂(HIC)敏感性;EIS是一种灵敏、无损的HIC监测手段,为桥梁钢焊接结构的安全性评估提供了新途径。
This study investigated the weld seam region of Q690D high-strength steel by using electrochemical impedance spectroscopy(EIS),microstructural analysis,and slow-strain-rate testing to systematically examine how different weld zones respond to cathodic hydrogen charging.The results show that the coarse-grained heat-affected zone(CGHAZ),because of its coarse microstructure and high trap density,has the lowest charge transfer resistance and the highest susceptibility to hydrogen-induced cracking(HIC).The research demonstrates that EIS is a sensitive,non-destructive method for monitoring hydrogen-induced cracking,providing a new approach to the safety assessment of welded bridge steel structures.
作者
张勇
王文洋
ZHANG Yong;WANG Wenyang(Guangxin Testing&Certification Group Co.,Ltd.,Jinan 250000,Shandong,China)
出处
《上海建材》
2025年第6期125-128,共4页
Shanghai Building Materials
关键词
桥梁高强钢
焊缝
氢致开裂(HIC)
电化学阻抗谱(EIS)
电化学
bridge high-strength steel
weld seam
hydrogen-induced cracking(HIC)
electrochemical impedance spectroscopy(EIS)
electrochemistry
