高張力鋼溶接熱影響部における水素による割れと部分溶融(第 1 報) : 水素の放出と割れの直接観察

概要

論文の詳細を見る
The direct observation of hydrogen bubble evolution and cracking behavior, such as initiation and propagation at a heat-affected zone (HAZ) was performed using the device with a microscope, and some new understanding were obtained. The site of hydrogen evolution almost usually located at sulfide inclusion and/or liquated grain boundary, and the rate of hydrogen evolution had a maximum value at a certain tensile stress followed by decreasing with rise in applied tensile stress. As the peak temperature of a simulated HAZ was getting higher, the morphology of cracking was changed from transgranular with a lot of plastic deformation to intergranular with little plastic deformation, and the stress enough to initiate cracking became smaller. From these results, it seems to be most likely that hydrogen-assisted cracking has a close correlation with a partial melting occurred in a welded HAZ.
社団法人溶接学会の論文
1981-07-05