|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III
||Relations between Microstructure and Oxidation Resistance of an Additive Manufactured Nickel-based Superalloy
||Zhenyu Liu, Satia Soltanattar, Brian Gleeson, Guofeng Wang
|On-Site Speaker (Planned)
In this study we investigated the relations between the microstructure and associated high-temperature oxidation properties of additive manufactured Inconel 625 (IN625). Using Laser Engineered Net Shaping (LENS) technology, we fabricated 1x1x1 cm cubes from argon-atomized IN625 powders. The microstructure of these LENS-processed IN625 consisted of primary dendrites and fine cellular grains. Characterization revealed a significant microsegregation of Nb and Mo at the boundaries of the fine grains due to local rapid solidification processes. Thermogravimetric analysis was then conducted to determine the intrinsic oxidation resistance of the LENS-processed IN625 samples exposed to dry air at 800șC and 1000șC for up to 100 h. The kinetics results indicated that the LENS-processed IN625 exhibited less resistance to oxidation as compared to wrought IN625. The results will be discussed in the context of Nb and Mo microsegregation to the grain boundaries detrimentally affecting the oxidation resistance of the LENS-processed IN625.
||Planned: Supplemental Proceedings volume