|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location-Specific Processing-Microstructure-Property Relationships
||A-8: Characterization of Carbide Precipitates in Nickel-Base Superalloy MAR-M247 Fabricated through Scanning Laser Epitaxy
||Amrita Basak, Suman Das
|On-Site Speaker (Planned)
Nickel-base superalloys develop high-temperature strength primarily due to the solid-solution-strengthening and the precipitation-strengthening mechanisms typically through cobalt/chromium and aluminum/titanium, respectively. Certain other elements such as boron and zirconium are chosen for grain boundary strengthening. Such elements tend to segregate to the grain boundaries, which reduce the grain boundary energy resulting in better grain boundary cohesion and ductility. Another form of grain boundary strengthening is achieved through the addition of carbon and various carbide formers. The carbide formers drive precipitation of carbides at grain boundaries thereby reducing grain boundary sliding. Various types of carbides are possible in the microstructure of superalloys depending on the composition and processing. However, in MAR-M247 fabricated through SLE, only blocky carbides were predominantly observed. Scanning electron microscopy and energy dispersive X-ray spectroscopy investigations were carried out and the carbides were found to be tantalum-rich. This work is sponsored by the ONR through grant N00014-14-1-0658.
||Planned: Supplemental Proceedings volume