About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Deformation and Damage Mechanisms of High Temperature Alloys
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Presentation Title |
Investigating Deformation Mechanisms in Ni-based Superalloys with Compact γ'- γ" Coprecipitates |
Author(s) |
Semanti Mukhopadhyay, Hariharan Sriram, Richard DiDomizio, Andrew Detor, Robert Hayes, Gopal B. Viswanathan, Christopher Zenk, Yunzhi Wang, Michael Mills |
On-Site Speaker (Planned) |
Semanti Mukhopadhyay |
Abstract Scope |
Compact coprecipitate morphology in IN718 based alloys, consisting of γ'' phase on all {100} faces of cuboidal γ' precipitates, has been shown to possess superior coarsening resistance. Two microstructures consisting of such a coarsening resistant morphology of γ' and γ'' coprecipitates were stabilized in an IN718-variant alloy (IN718-27) through careful control of processing parameters. While one of the microstructures (A) consists of a unimodal distribution of ‘compact’ coprecipitates, another microstructure (B) exhibits secondary compact coprecipitates along with tertiary composite coprecipitates. The microstructures of these alloys were characterized after tensile creep to 0.5% strain, which revealed that two different modes of deformation are active in A and B. Creep-deformed microstructures investigated through advanced characterization techniques (ECCI, DC-STEM, HR-STEM) will be discussed. The findings will be complemented with the microstructural characterization of creep deformed conventionally processed wrought IN718. The experimental observations will be supplemented by results from a microscopic phase-field model. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Phase Transformations, High-Temperature Materials |