|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Functional, Energy, and Magnetic Materials
||Meltpool Oxidation and Reduction and Inclusion Evolution during the PBF Type Additive Manufacturing
||Durim Eo, Seong Gyu Chung, Jungwook Cho
|On-Site Speaker (Planned)
Oxide dispersion strengthened material can be fabricated via AM process by mixing oxide dispersion with alloy powder directly or control oxide inclusion evolution during the solidification. To optimize the strengthening effect by oxide inclusion, oxygen content and inclusion size should be optimized with the knowledge about the meltpool oxidation and reduction and inclusion evolution kinetics. To comprehend these subjects, stainless steel 316L blocks were fabricated with the powder bed fusion type AM process under different process parameters including basic parameters (P, V, h, and gas flow) as well as directional relationship between the shielding gas flow and laser scanning. It was found that in 316L alloy system, meltpool reduction and oxidation occurred simultaneously during the process involving CO and CO2 gas formation with vapor jet formation and dissolution back to the meltpool. Also it is found that the nucleation and growth kinetic of oxide inclusion is strongly dependent on process parameters.
||Additive Manufacturing, Characterization, Nuclear Materials