Abstract
The microstructure of laser additively manufactured nickel-based superalloy was analyzed using multi-scale characterization. The phase composition of the as-deposited sample was determined. The formation mechanisms of β-NiAl and C14-Laves phases were studied in depth. The crystallographic orientation relationship between the β-NiAl and C14-Laves phases was elucidated. The formation of the β-NiAl phase exacerbates the elemental segregation at the interface, leading to the generation of micro-strain and dislocations that provide nucleation sites for the C14-Laves phase. In addition, the effect of solidification rate on the precipitation of precipitated phases from the alloy was excluded. The present work contributes to understanding the precipitation behavior of β-NiAl and C14-Laves phases in nickel-based superalloys.
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