1036 溶接部を持つ強度部材の水素遅れ破壊挙動について

概要

論文の詳細を見る
It is well known that high strength steels are highly strengthened, they have higher susceptibility of delayed fracture. In high strength steel welds, it is probable that the same phenomenon occurs. For the sake of this research of delayed fracture behavior of high strength steels welds, sustained load tests were carried out under hydrogen environments using solid bar specimens which consist of three parts; Matrix, HAZ(Heat Affected Zone) and Weld Metal. Even if the applied stress is lower than the yield strength of Matrix, fracture occurred at the part of Weld Metal in hydrogen environment When applied stress was higher than yield strength of Matrix, fracture occurred at the part of the Matrix. And when applied stress was lower than yield strength of the Matrix, fracture occurred at the part of either Weld Metal or HAZ. Detailed examination with SEM and optical microscope revealed that the part of Weld Metal has complicated structure for example fine grain structure, coarse grain structure, columnar structure, so it is thought that the part of Weld Metal may have more crack initiation points and have higher susceptibility of delayed fracture than that of Matrix.
社団法人日本機械学会の論文
2003-09-23