Effect of heat treatments on /' microstructures and strengthening in cobalt-base superalloys created by powder metallurgy

R. Casas, F. Galvez, M. Campos, David C. Dunand, David N. Seidman

Research output: Contribution to conferencePaper

Abstract

Given the importance of nickel-base superalloys, there is interest in developing new cobalt-based superalloys with a dual phase (face-centered cubic)/'-Co3(Al,W) (L12) microstructure. Novel Co-based superalloys with this dual microstructure, have been developed by powder metallurgy (PM) techniques in our research. Starting from two particular compositions, Co-12Al-10W at.% and Co-12Al-10W-2Ti-2Ta at.%, processed by mechanical alloying (MA) alloys have been consolidated utilizing field-assisted hot pressing (FAHP). Our research is focused on the effects of specific heat treatments on the final microstructure. The results are linked to the final '-Co3(Al,W) (L12) volume-fraction, which depends on the temperature and times employed during both steps of the heat treatments. Microhardness measurements of both compositions demonstrate that Ti- and Ta-additions increase the microhardness values of the Co alloy. This quinary alloy also exhibits an increase of the '-Co3(Al,W) (L12) volume-fraction on the final samples.

Original languageEnglish (US)
StatePublished - Jan 1 2017
EventInternational Powder Metallurgy Congress and Exhibition, Euro PM 2017 - Milan, Italy
Duration: Oct 1 2017Oct 4 2017

Other

OtherInternational Powder Metallurgy Congress and Exhibition, Euro PM 2017
CountryItaly
CityMilan
Period10/1/1710/4/17

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Keywords

  • Ageing
  • Cobalt-base superalloys
  • Solubilization
  • Ti- Ta- alloying elements

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Surfaces and Interfaces

Cite this

Casas, R., Galvez, F., Campos, M., Dunand, D. C., & Seidman, D. N. (2017). Effect of heat treatments on /' microstructures and strengthening in cobalt-base superalloys created by powder metallurgy. Paper presented at International Powder Metallurgy Congress and Exhibition, Euro PM 2017, Milan, Italy.