Eutectic Superalloys for Laser Powder Bed Fusion
摘要
Due to the small freezing range of eutectic alloys, the Cotac-type alloys might be viable alternatives to conventional Ni-based superalloysNi- based superalloy when processed through additive manufacturingAdditive manufacturing. Laser pass assessment reveals that both Cotac-74 and Cotac-744 display improved crackingCracking resistance when compared to the conventional Ni-based superalloyNi- based superalloy CM247LC. During laser powder bed fusionLaser Powder Bed Fusion (LPBF) Cotac-74 displayed the highest crackingCracking resistance, with no microcracking detected in the as-built or heat-treated microstructureMicrostructure. The promising results presented for Cotac-74 highlight the possible use of this alloy for the additive manufacturingAdditive manufacturing of high-temperatureHigh-temperature aerospace components.