Abstract
In the present study, the rupture behavior and fracture mode for the Inconel 625–9% Cr steel dissimilar welded joints are investigated. The results reveal that the relationship between the rupture time and stresses follows the formula: lg (t) = − 0.028 σ + 6.75, while the microhardness measurement shows that the specimens with applied stresses under 620 ℃ both fracture in the heat affected zone of 9% Cr steel (9Cr-HAZ). Therefore, the microstructure of the 9Cr-HAZ adjacent to the fracture is emphatically observed, and it is found that the tempered martensite is the typical microstructure in 9Cr-HAZ. Simultaneously, massive micro-voids can be detected in 9Cr-HAZ along the grain boundaries. In addition, the particles around the micro-voids are identified as Laves phases combining with M23C6-type carbides. Thus by consuming the solid solution strengthening elements, especially W and Cr, the precipitation of these second phase particles softens the matrix, which can cause the formation of micro-voids. Subsequently, the initiation and convergence of those dispersed voids eventually lead to the failure of the ruptured specimens.
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