Abstract
A material’s properties must be continuously improved to meet the demands of extreme conditions in high-temperature applications. It is demonstrated that γ-γ’ Co-based superalloys could surpass the yield stress of Ni-based superalloys at high temperature due to the γ-γ’ structure. The powders were subjected to a harmonic modification in order to refine the grain structure on the surface and to activate the sintering process. This study examines how harmonic structure affects microstructure and mechanical properties at high temperatures. Spark Plasma Sintering (SPS) was used for consolidation to maintain the ultrafine grain size microstructure of the powder. Compression tests were conducted from room temperature (RT) to 750 °C to assess the mechanical properties of the material. Yield stress values obtained from harmonic structures are four times higher than those obtained from cast alloys.
Original language | English |
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Article number | 70 |
Journal | Metals |
Volume | 14 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2024 |
Funding
The author L. García de la Cruz received funding from the “Call for Grants for the requalification of the Spanish university system for 2021-2023”, from the Carlos III University of Madrid, of July 1, 2021. The research was supported by funding from the Madrid region under the program S2018/NMT-4381 with the MAT 4.0-CM Project, Spain. ATP research was supported by Center for Nanophase Materials Science. U.S. Department of Energy (DOE) Scientific User Facilities Division—Ref. CNMS2019-201.
Keywords
- co-based superalloys
- harmonic structure
- γ-γ’ strengthening