Abstract
Local strength mismatch is one of the important factors which affects the fracture behavior of a dissimilar metal welded joint (DMWJ). The question to consider is how to improve the fracture resistance of the DMWJ effectively by optimizing the local strength mismatch. In this paper, a DMWJ in a nuclear power plant was selected, the J-resistance (J–R) curve and crack growth path of the DMWJ under different strength mismatches of heat affect zone (HAZ), fusion zone (FZ), and near interface zone (NIZ) were systemically studied. And then, the optimal design of the local strength mismatch was investigated. The results show that decreasing the strength of HAZ and NIZ and increasing the strength of FZ will increase the fracture resistance of a DMWJ. Increasing the strength of FZ increases the J–R curve obviously. When the Ms(HAZ):Ms(FZ):Ms(NIZ) = 1.12:1.4:1.26 and Ms(HAZ):Ms(FZ):Ms(NIZ) = 1:1.4:1, the DMWJs have the highest J–R curves. Considering that the two J–R curves are similar, it is suggested that the fracture resistance of the DMWJ can be improved only by increasing the strength of the FZ.
Highlights
As an indispensable part of nuclear power plant, the dissimilar metal welded joint (DMWJ)has been widely used
Considering that the two J–R curves are similar, it is suggested that the fracture resistance of the DMWJ can be improved only by increasing the strength of the fusion zone (FZ)
The Changing of Strengh Mismatch in FZ Effect on the Fracture Behavior of DMWJ
Summary
As an indispensable part of nuclear power plant, the dissimilar metal welded joint (DMWJ). Many scholars focused on the study of strength mismatch effect on the steel fracture weld joint affected by strength mismatch behavior of bi-material interface. Negre et al [17] and Samal et al [18] investigated the local fracture recent years, scholars focusedbyonthe thelocal study of strength mismatch effect on the fracture resistanceInand crack pathmany deviation affected strength mismatch in the bi-material interface behavior of bi-material interface. Some scholars investigated the fracture behavior interface region under different work hardening mismatches [20,21,22,23].of DMWJ affected by strength mismatchBesides,. This study clarified the effect of strength mismatch on the fracture behavior of welded joints, the foundation for the building of accurately structure integrity assessment. The optimal design of the local strength mismatch was investigated
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