Evaluation of residual stress distribution in Ni base alloy clad welds by numerical simulation and X-ray stress measurement

摘要

Dissimilar material components such as clad welds are important to achieve both performance, and economic and ecological efficiency. The evaluation of the residual stress distribution in such components is needed to assess and assure the integrity of structures components. In this study, the residual stress distribution in clad welds of Ni base alloy over low alloy steel was investigated. A clad welded mock-up was fabricated, and the residual stress distribution was evaluated by X-ray stress measurement method and finite element simulation. The residual stress was measured with high accuracy even in coarsened Ni base alloy clad weld metal by X-ray stress measurement method utilising a two-dimensional detector and multiaxial rocking technique. The residual stress distribution was well reproduced by the finite element simulation considering the redistribution due to cutting off of the specimen from the fabricated mock-up.