高張力鋼溶接熱影響部における部分溶融域の形成について(第 1 報) : 部分溶融域の観察と偏析

概要

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It seems very likely that cold cracking due to hydrogen can be nucleated from either liquated grain boundaries and/or liquated segregation bands in weld heat-affected zone. It has been in need to make much study on the formation of partially-melted regions in HAZ of steel weldment. In this study, the effect of alloying elements and carbon content on partially melting in HAZ of several steels made in a laboratory was examined using a high temperature microscope. Preferential grain-boundary liquation, which occurred at the lower temperature than the solidus, was observed at synthetic HAZ of steels with carbon contents above 0.1wt%, and was the most remarkable at about 0.14wt% carbon content. It was known that there was a close correlation between the liquation phenomenon of grain boundary and the segregation tendency of alloying elements (Ni, Cr and Mo) at the bands associated with worked cast ingot.
社団法人溶接学会の論文
1979-12-05