Abstract
Alloys made by Additive Manufacturing (AM) require careful design of post-heat treatment as an indispensable step of microstructure engineering to enhance performance. We developed a high-throughput approach to accelerate the heat treatment optimization for AM alloys by fabricating a long-bar sample heat-treated under a monitored gradient temperature zone for phase transformation study. This approach has been proven efficient in determining the aging temperature with peak hardness. We observed that precipitation strengthening is the predominant strengthening mechanism for the studied superalloy made by laser powder bed fusion, and the grain size variation is insensitive to temperatures between 605 and 825°C. This new approach can be applied to post-heat treatment optimization of other materials made by AM, and further assist new alloy development.
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