|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III
||Microstructure and Mechanical Properties of Selectively Laser Melted IN718 Alloy before and after Heat Treatment
||Le Zhou, Abhishek Mehta, Yongho Sohn
|On-Site Speaker (Planned)
IN718 alloy was fabricated by selective laser melting (SLM) for examination of microstructure and mechanical properties by electron microscopy and instrumented indentation, respectively. The as-built alloy featured a characteristic SLM microstructure with Nb, Mo and Ti segregated along the interdendritic region. The alloys were then subjected to solution heat treatment (SHT) at 980░C or 1065░C for 1 hour, followed by double aging. The segregation was mostly removed after SHT. Recrystallization was observed when SHT was performed at 1065░C, with small amount of carbides decorated along the grain boundaries. SHT at 980░C led to the formation of δ-phase in the interdendritic regions. Precipitation of γ’ and γ’’ were observed after double aging. Reduced modulus and hardness decreased after SHT, but increased after aging. A higher hardness was obtained when SHT was carried out at 1065░C. Correlation in microstructure and mechanical properties for the SLM-fabricated IN718 alloy will be presented and discussed.
||Planned: Supplemental Proceedings volume