|About this Abstract
|2023 TMS Annual Meeting & Exhibition
|Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
|Influence of Local Thermal History during Laser Powder Bed Fusion Additive Manufacturing on Solidified Microstructure and Phase Transformations during Subsequent Heat Treatment
|Andrew E. Wessman, Yi Zhang
|On-Site Speaker (Planned)
Changes in processing parameters and part geometry in laser powder bed fusion additive manufacturing can influence the local thermal history of materials during the build process. These variations in factors such as cooling rate, solidification velocity and peak temperature can result in changes in the as-solidified cellular precipitate and/or grain structure in superalloys processed in this way. This presentation will describe the effect of changing thermal history on the microstructure of as-built superalloys IN718 and Haynes 282 and the impact of these variations on subsequent microstructural evolutions during solution heat treatment and aging cycles. Thermal history will be obtained through in-situ thermal tomography of the AM process, which will also be used to compare observed results to those obtained through Scheil models of the solidification process and CALPHAD and precipitation models of the expected microstructures.
|High-Temperature Materials, Characterization, Additive Manufacturing