高張力鋼溶接熱影響部の靱性におよぼす硫化物の影響について

概要

論文の詳細を見る
In this study, the effect of isothermally holding nearly just below a melting temperature of high strength steel on the notch toughness of the heat-affected zone adjacent to a weld bond was investigated. The result of this work has shown that an isothermally holding at high temperature in a large heat input welding process has a deleterious effect on the impact toughness of the weld heat-affected zones, and that it is caused by a overheating associated with a resolution of sulfide inclusions during heating and their subsequent reprecipitation as very fine arrays of inclusions on a high temperature austenite grain boundaries. And so, it was indicated that the resolution of sulfide inclusions and their subsequent reprecipitation on grain boundaries as well as prior austenite-grain coarsening and a formation of upper bainite structure, so far shown, were unnegligible factors causing a reduction in notch impact toughness of a weld heat-affected zones.
社団法人溶接学会の論文
1976-03-05