合金钢焊接区显微组织与扩散氢的动态分布关系  

Relation between microstructure and microdistributions of diffusible hydrogen in welded zone of alloyed steels

作　　者：杜则裕[1] 秦伯雄[1] 张智[1] 

机构地区：[1]天津大学

出　　处：《焊接学报》1994年第4期254-261,共8页Transactions of The China Welding Institution

摘　　要：运用显微镜下录像测氢法研究了４种不同预处理状态下的国产低合金高强钠焊接区扩散氢动态分布的规律。结合焊接接头不同组织区的硬度及金相分析，发现扩散氢在熔合区及粗晶区与细晶区交界处存在局部聚集，扩散氢呈变形正弦曲线分布。研究纺果表明：焊接区氢陷井的不均匀分布是造成扩散氢局部聚集的主要原因。这对于工程实践中防止焊接冷裂纹产生以及进一步分析焊接冷裂纹的形成机理提供了理论依据。The law of microdistributions for diffusible hydrogen in welded zone for four kinds of HSLA steels under different pretreatment is studied with the method of measuring thehydrogen bubbles under the microscope by video-recorder. According to the analysis of boththe hardnees and the microstructure it has been found that the distribution of diffusible hydrogen in welded zone is consistent with variant sine-law ,and there is local accumulation of hydrogen in fusion zone and the juncture between coarse grained and finegrained zone.The results show that the nonuniform distribution of hydrogen trap is main influencefactor of local accumulation of diffusible hydrogen. The law mentioned above,providesa theoretical basis for analying the influenees of the diffusible hydrogen on the weldingcold cracking and preventing the welding cold cracking in engineering practice.

关 键 词：扩散氢 焊接接头区 显微组织 合金钢 

分 类 号：TG457.11[金属学及工艺—焊接] TG441.7