|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||Effect of Heat Treatment and Chemical Composition on the Precipitation Behavior in Commercialized Age Hardening Nickel Based Alloys
||Miao Song, Zhijie Jiao, Mi Wang, David Woodley, Gary Was
|On-Site Speaker (Planned)
We report the microstructure characterization of several commercial purity nickel based alloys including alloy 625, alloy 718, and alloy 725. Nano scale precipitates γ״ are observed in all the alloys under ageing treatment, but are absent in the water quenched condition (alloy 625). The precipitates are homogenously distributed in the solid solution treatment and ageing condition, while are inhomogeneous in the direct age condition (625DA). The comparison of alloy 625Plus, alloy 718 and alloy 725 allow a direct comparison of major alloy elements effect on the precipitation behavior. γ' precipitate are observed in alloy 718, and can be negligible in all the other alloys. These γ' precipitates serve as a heterogeneous nucleation site for γ״ precipitates to reduce the coherent energy. The precipitation behaviors of these alloys are discussed through different heat treatment history and nano-chemistry analysis of precipitates by atomic probe tomography (APT).
||Planned: A print-only volume