This study investigated dissimilar friction welding of Alloy 718 to SNCRW stainless steel. After friction welding, the effect of post-weld heat-treatment (PWHT) on the microstructure and mechanical properties was carefully studied. For this purpose, friction welded samples were annealed at 500, 720, and 900 ℃ for 8 hrs, respectively. Heat-treatment at 720 ℃ resulted in highest hardness due to the precipitation of g". On the other hand, relatively low hardness was obtained when PWHT was not performed, or the heat-treatment temperature was not 720 ℃. Residual stress in the welded joints was effectively reduced when heat treatment was performed at temperatures above 720 ℃. Friction welded specimens fractured at the weld joint when no PWHT was performed or when PWHT was performed at 500 or 900 ℃. On the other hand, when PWHT was performed at 720 ℃, tensile failure occurred in the SNCRW base metal.
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