电化学充氢条件下管线钢焊接接头对氢的吸收能力分析  

Hydrogen absorbing ability of pipeline steel welded joint in condition of electrochemical hydrogen

作　　者：贾清松 吕小青[1,2] 韩永典[1,2] 徐连勇[1,2] 荆洪阳[1,2] 尚进[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]天津市现代连接技术重点实验室,天津300072

出　　处：《焊接学报》2017年第9期111-114,共4页Transactions of The China Welding Institution

摘　　要：采用电化学的方法研究X65管线钢母材及其高频电阻焊(high-frequency welding-HFW)焊缝对电化学充氢的吸收能力.结果表明,随着充氢时间的增加,母材和焊缝中的扩散氢的含量有着一样的变化趋势,先升高然后降低达到稳定值,但是焊缝中的扩散氢含量最高值4.11×10^(-5)mol/cm^3、稳定值2.96×10^(-5)mol/cm^3均高于母材的4.02×10^(-5)mol/cm^3和2.78×10~(^(-5))mol/cm^3,所以焊缝对电化学充氢有着更高的敏感性.这是因为材料的晶粒尺寸和晶界面积对氢在其中的扩散吸收有着极其重要的作用,同时,相比于X65管线钢母材,焊缝中珠光体与铁素体的显微硬度差值更大,这为氢提供了有效的扩散路径.The absorption capacity of electrochemical hydrogen charging is investigated for the X65 pipeline steel base metal and its high frequency resistance welded seam with electrochemical method. The results show that with the increase of hydrogen charging time,the contents of diffusible hydrogen in the base metal and weld material have the same change trend that first increase and then decrease to stable value. But the maximum and stable values among the contents of diffusible hydrogen in the weld are higher than those in base metal. So the weld has a higher sensitivity for electrochemical hydrogen charging. This is because the grain size and area of grain boundary in the material are of high significance in hydrogen diffusion and absorption.Meanwhile,compared with the X65 pipeline steel base metal,the difference in micro-hardness between pearlite and ferrite in the weld is larger,providing an effective diffusion path for hydrogen.

关 键 词：电化学充氢 管线钢 高频电阻焊 扩散氢浓度 显微硬度 

分 类 号：TG457.6[金属学及工艺—焊接]