Abstract: The microstructure and mechanical properties in the inertia friction welded (IFW) dissimilar joints of K447A+GH4169 were studied. The results show that the flash of K447A+GH4169 IFW joint was mainly generated by GH4169. Fine recrystallization zone was formed near the friction interface on both sides of K447A and GH4169. Fine γ' phase which was precipitated dispersed in the weld zone (WZ) after heat processing. Most of δ phase in the weld zone of GH4169 side was dissolved and part of δ phase was dissolved in thermo-mechanical affected zone (TMAZ).After aging treatment, no δ phase precipitation was found in the zone of TMAZ and WZ. The result of elements interdiffusion zone by electron probe microanalysis (EPMA) was observed. The tensile strength of GH4169+K447A IFW joints were equal to K447A base metal,the time of high temperature endurance testing exceeded 75 h.
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2018, Vol. 32 
