About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials for High Temperature Applications: Next Generation Superalloys and Beyond
|
Presentation Title |
Enhancing the Creep Performance of a Corrosion Resistant Ni-based Superalloy through Grain Boundary Design |
Author(s) |
Martin Detrois, Paul D Jablonski, Jeffrey A Hawk |
On-Site Speaker (Planned) |
Martin Detrois |
Abstract Scope |
Alloys with a combination of oxidation resistance and high-temperature creep properties are needed for operation in future advanced ultra-supercritical (AUSC) power plants. An approach to satisfy AUSC requirements consists of modifying commercially available alloys, such as Ni-based superalloys originally developed for aerospace application. In this work, the chemistry and aging heat treatment of a corrosion resistant alloy were modified to increase its mechanical performance at temperatures above 700°C. By enabling the precipitation of stable secondary phases along the grain boundaries, the yield stress and ultimate tensile strength were increased. Furthermore, the creep life of the best performing alloy variant was improved by 256% compared to the baseline alloy at the condition of interest. The modified aging treatment increased the creep life and ductility from 40% to 370% and 53% to 550%, respectively and depending on the alloy’s chemistry. The results from 6 alloy variants will be presented and discussed. |
Proceedings Inclusion? |
Planned: |