The Microstructural Evolution of CM247LC Manufactured Through Laser Powder Bed Fusion

Abstract Numerous challenges persist with the additive manufacturing of high γ ′ containing Ni-based superalloys such as CM247LC. Currently, significant cracking occurs during deposition CM247LC components using laser powder bed fusion and post-processing. Whilst post-deposition procedures seek to eliminate or minimise cracks, current do not produce a microstructure suitable for service. This study systematically investigates microstructural evolution manufactured following multiple post processing treatments. Phase textural changes after each step were consistent previous studies, although an additional Hf-rich Cr-depleted segregation zone was identified along intercellular boundaries in as-deposited condition, believed be associated propensity. Compositional modification including removal Hf, reduction C addition Nb eliminated but these increased susceptibility solidification liquation cracking.