Abstract
This investigation presents the microstructural characterization and creep failure mechanism of a dissimilar weld (DW) of Inconel 600 (IN600) and Inconel 625 (IN625) at a temperature of 675 °C and different stress levels. Optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and Vickers microhardness test were used to characterize the welded joint, the creep rupture features, and microstructural characteristics of the DW respectively. The experimental results show that the crept samples consistently broke on the base material of the IN600 side and that the failure was mainly controlled by the plastic deformation of coarser austenitic grains, dynamic recrystallization, and the coalescence and growth of microcracks that resulted from the evolution of the Cr-rich carbides along the grain boundaries that conducted to a transgranular fracture mode.
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