About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Materials for High Temperature Applications: Next Generation Superalloys and Beyond
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Presentation Title |
Mechanical Properties and Microstructural Characterization of Cast Haynes 282 for Advanced Ultra-supercritical (A-USC) Applications |
Author(s) |
Ling Wang, Kinga A. Unocic, Peter F. Tortorelli, Xiang (Frank) Chen |
On-Site Speaker (Planned) |
Ling Wang |
Abstract Scope |
Precipitation strengthened Ni-based alloys are leading candidate materials for Advanced Ultra-Supercritical (A-USC) plants with steam conditions up to 760oC (1400oF)/35 MPa (5 ksi). This project focuses on evaluating representative specimens from the largest sand casting of Haynes 282 (pour weight of 3,175 kg). The tensile test results of Haynes 282 casting over the temperature range 20-816oC exhibited lower tensile strength and ductility in comparison with the wrought reference Haynes 282. However, the creep rupture tests of the cast alloy under 700-788oC presented similar Larson-Miller parameter as the wrought material, with the creep rupture time range between 1,515 and 5,452 hours. Characterization involved scanning electron microscopy (SEM) and scanning transmission electron microscopy (S/TEM) in conjunction with energy dispersive x-ray spectroscopy to understand the microstructural changes, dislocation structure, carbides distribution and the morphology of the gamma prime precipitates exposed to elevated temperatures and to establish relationship between microstructures and mechanical properties. |
Proceedings Inclusion? |
Planned: |