Ni 基耐熱合金の溶接後熱処理割れに関する研究(第 4 報) : 溶接後熱処理割れの機構に対する考察

概要

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From the results obtained in this study, the mechanism of post-weld heat treatment (PWHT) cracking in Ni-base heat resistant alloys is as follows. Namely, when the welded joint which contains high residual stress is heated to the solution treatment temperature, fine γ′particles precipitate in the matrices of coarse grains adjacent to the weld interface and as the result, flow stress in coarse grain region increases. The increase of flow stress in matrix results in concentrating stress at the triple point of grain boundary. If the stress concentrated at the triple point of grain boundary exceeds the cohesive strength of grain boundary which is decreased by the segregation of S to the grain boundary, PWHT cracking occurs at coarse grain boundary.
社団法人溶接学会の論文
1978-10-05