|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Powder Materials Processing and Fundamental Understanding
||Understanding of Agglomeration and Chemical Reactions of CoAl2O4 Inoculants in IN718 Processed by Selective Laser Melting
||I-Ting Ho, Kai-Chun Chang, Dhruv Tiparti, An-Chou Yeh, Sammy Tin
|On-Site Speaker (Planned)
The investigation aims to clarify the influence of laser scan parameters on the agglomeration and phase constitution of CoAl2O4 inoculants blended with superalloy Inconel 718 (IN718) powder feedstock and processed by selective laser melting (SLM). Preliminary results show that following the SLM process, CoAl2O4 inoculants were chemically reduced into Al2O3, Cr2O3, and TiO2 oxides, and Co-rich particles. Due to the multiple iterations of remelting as new layers are deposited during processing, the Co-rich particles formed as the CoAl2O4 inoculants were reduced in the melt pool did not survive and did not facilitate heterogeneous nucleation events. Additionally, the reduced oxide particles were found to agglomerate along the scan direction. Increasing the laser scan velocities were found to reduce the tendency for agglomeration but also resulted in an incomplete reduction of CoAl2O4 in the melt pool. Preliminary results will be presented and discussed.
||Additive Manufacturing, Copper / Nickel / Cobalt, Other