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Surface Feature Characteristics of Laser Powder Bed Fusion of Nickel Super Alloy 625 Bulk Regions



Jason Fox, Romaine Isaacs, Aarush Sood, Paul Brackman, Brigid Mullany, Edward Morse, Angela Allen, Edson Santos, Christopher Evans


Coherence scanning interferometry (CSI) and scanning electron microscopy (SEM) surface inspection of additively manufactured nickel super alloy 625 reveal features over a broad range of length scales beyond those typically reported. High resolution measurements show micrometer-scale dendritic periodicity over 10's-of-micrometers length scales, often with a circular geometry. Larger-than-anticipated solidified melt tracks are observed near laser path turnarounds, presumably resulting from fusion of adjacent melt pools and cooling rate differences. The dendritic texture variability directly indicates microstructure variation, and further microstructure variation is likely correlated with the melt pool variation, as well. This raises concerns about final material properties and homogeneity.
Proceedings Title
Procedia CIRP
Conference Dates
June 8-10, 2022
Conference Location
Lyon, FR
Conference Title
6th CIRP Conference on Surface Integrity


additive manufacturing, laser powder bed fusion, surface metrology


Fox, J. , Isaacs, R. , Sood, A. , Brackman, P. , Mullany, B. , Morse, E. , Allen, A. , Santos, E. and Evans, C. (2022), Surface Feature Characteristics of Laser Powder Bed Fusion of Nickel Super Alloy 625 Bulk Regions, Procedia CIRP, Lyon, FR, [online],, (Accessed June 13, 2024)


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Created June 1, 2022, Updated April 11, 2023