|About this Abstract
||Materials Science & Technology 2019
||Additive Manufacturing of Metals: Microstructure and Material Properties of Nickel-based Alloys
||Experimental Characterization and Modeling of Solidification Cracking in Gamma-prime Strengthened Ni-based Superalloys
||Colleen Hilla, Michael Mills, Wei Zhang, Andrew Wessman, Hyeyun Song, Alber Sadek
|On-Site Speaker (Planned)
A primary concern in additive manufacturing of gamma-prime strengthened Ni-based superalloys is solidification cracking. The mechanisms for solidification cracking are complex, but the micro-segregation upon non-equilibrium solidification is recognized as a major driving force. This study aims at developing an improved understanding of solidification cracking mechanisms in additively manufactured Ni-based superalloys. The as-built microstructure of a crack resistant Rene65 produced by powder bed fusion-laser (PBF-L) was characterized to understand the extent of micro-segregation, grain size and texture development. The measured micro-segregation profile was used to validate a Scheil based non-equilibrium solidification simulation. The Scheil simulation was applied to both Rene65 and the crack susceptible MarM247; data for the latter was taken from the literature. Compositional differences, solidification temperature ranges, slope of solidification fraction curve at final stage of solidification, γ’ percent, and γ/γ’ mismatch were compared for the two alloys to determine influences of various factors on solidification cracking.
||Planned: At-meeting proceedings