|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Metal-Matrix Composites: Advances in Processing, Characterization, Performance and Analysis
||Particle Injection and Phase Formation in Directed Energy Deposited Nickel-based Superalloy Composites
||Sen Jiang, Baolong Zheng, Xin Wang, Benjamin E. MacDonald, Yizhang Zhou, Julie M. Schoenung
|On-Site Speaker (Planned)
Directed energy deposition (DED) has been demonstrated to be an effective alternative in fabricating particle reinforced metal matrix composites (MMCs). The volume fraction of reinforcement particles injected and the interactions between the reinforcement particles and the molten pool can significantly affect the phase formation upon solidification in deposited parts. In this work, two types of nickel-based superalloy composites, Inconel 718/TiC and Haynes 282/TiC, were deposited using laser engineered net shaping (LENSŪ) with premixed powder feedstock. High-speed photography was used to record and analyze the powder flow as well as the powder-molten pool interactions during deposition. The resultant microstructures in the as-deposited parts were characterized with electron microscopy (SEM and TEM). Scheil solidification calculations were performed with Thermocalc software to study the effects of TiC content and elemental segregation on phase formation. The mechanical behavior of the deposited composites was also evaluated, and the related deformation mechanisms are discussed.
||Additive Manufacturing, Composites, Solidification