Effect of post-weld heat treatment on microstructure and mechanical properties of T92/HR3C dissimilar metal welded joints

doi:10.13251/j.issn.0254-6051.2023.10.014

Abstract

Abstract: T92/HR3C dissimilar steels were welded by manual tungsten inert gas (TIG) welding with Inconel 82 wire as filler metal. After post-weld heat treatment, the microstructure of each region in the joint was characterized by means of metallographic microscope and transmission electron microscope, and the tensile properties of the joint at room temperature were tested. The results show that the heat affected zone (HAZ) on the T92 steel side is composed of lath martensite and some equiaxed sub-grains. Moreover, there are continuous M₂₃C₆ carbides on the lath grain boundary, whereas the carbide in the grain is dissolved. The microstructure of HAZ on the HR3C steel side shows high thermal stability. The weld metal is composed of coarse austenite dendrite and M₂₃C₆ carbide, and there is a certain amount of dislocations. The tensile fracture of the joint occurs in the weld where near the fusion zone on the HR3C steel side, which shows ductile fracture feature.

Key words: dissimilar steel welding, post-weld heat treatment, nickle-based welds, microstructure, mechanical properties

CLC Number:

TG407

Jin Da, Wang Zhichun, Han Zhewen, Yu Jinghui, Wang Qibing, Kang Ju. Effect of post-weld heat treatment on microstructure and mechanical properties of T92/HR3C dissimilar metal welded joints[J]. Heat Treatment of Metals, 2023, 48(10): 102-108.

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