Abstract
This investigation focused on the effect of heat treatment (HT) temperature on microstructure and nanomechanical properties of Ni-based superalloy 625 fabricated by ultrasound-assisted wire arc additive manufacturing (UA-WAAM). The homogenization of the microstructure was significantly improved due to the HT helping unwanted secondary phases to dissolve back into the matrix. The nanoindentation results showed that with an increase in HT temperature, the average nano-hardness decreased from 2.13 ± 0.20 GPa to 1.39 ± 0.15 GPa, while the average creep displacement increased from 189.12 ± 33.26 nm to 634.79 ± 48.20 nm.
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