Abstract
GTD222 is an important structural alloy that is applied as a high-temperature hot-end part. In this work, the effect of a high-temperature (800–950 °C) aging treatment on the microstructural evolution and mechanical performance of a GTD222 superalloy fabricated with selective laser melting (SLM) processed is investigated. Precipitates of γ′-Ni3(Al, Ti) with different morphologies and sizes are obtained after different high-temperature aging treatment processes. When the aging temperature is below 850 °C, a large number of very small spherical γ′ phases and coarse plate like γ′ are precipitated in the aged samples. The spherical γ′ precipitates are homogeneously distributed in the alloy, while the plate-like γ′ precipitates are distributed along the boundaries of the cells. With increasing aging temperature, the γ′ precipitates are significantly coarsened, and the yield strength (YS) decreases. The strength and ductility reach the best balance herein when the aging temperature ranges from 850 °C to 900 °C.
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