Enhancement of γ/γ’ Microstructured Cobalt Superalloys Produced from Atomized Powder by Creating a Harmonic Structure

Campos, Mónica; Cartón-Cordero, Marta; García de la Cruz, Lucía; Caballero, Francisca G.; Poplawsky, Jonathan D.; Torralba, José M.

doi:10.3390/met14010070

Enhancement of γ/γ’ Microstructured Cobalt Superalloys Produced from Atomized Powder by Creating a Harmonic Structure

Journal Article · Sun Jan 07 00:00:00 EST 2024 · Metals

DOI:https://doi.org/10.3390/met14010070· OSTI ID:2438699

^[1]; Cartón-Cordero, Marta ^[2]; García de la Cruz, Lucía ^[1]; ^[2]; ^[3]; ^[4]

Univ. Carlos III de Madrid (Spain)
Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). National Center for Metallurgical Research (CENIM)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Univ. Carlos III de Madrid (Spain); IMDEA Materials Institute, Madrid (Spain)

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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2438699

Journal Information:: Metals, Journal Name: Metals Journal Issue: 1 Vol. 14; ISSN 2075-4701

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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