Enhancement of gamma/gamma" Microstructured Cobalt Superalloys Produced from Atomized Powder by Creating a Harmonic Structure Articles uri icon

published in

publication date

  • January 2024

start page

  • 1

end page

  • 15

issue

  • 1

volume

  • 14

International Standard Serial Number (ISSN)

  • 2075-4701

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.

subjects

  • Materials science and engineering

keywords

  • co-based superalloys; y-y'; strengthening; harmonic structure