TY - CONF
T1 - Effect of heat treatments on /' microstructures and strengthening in cobalt-base superalloys created by powder metallurgy
AU - Casas, R.
AU - Galvez, F.
AU - Campos, M.
AU - Dunand, David C.
AU - Seidman, David N.
N1 - Funding Information:
The authors acknowledge a DIMMAT grant funded by the Madrid region under the program S2013/MIT-2775 and the UC3M grants for researcher mobility in foreign research center in 2016. Prof. David C. Dunand and Prof. David N. Seidman are kindly thanked for co-advising during the research stay at Northwestern University. This work was supported via award 70NANB14H012 from the U.S. Department of Commerce, National Institute of Standards and Technology as part of the Center for Hierarchical Materials Design (CHiMaD).
Publisher Copyright:
© 2017 European Powder Metallurgy Association (EPMA).
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
KW - Ageing
KW - Cobalt-base superalloys
KW - Solubilization
KW - Ti- Ta- alloying elements
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M3 - Paper
AN - SCOPUS:85056562464
T2 - International Powder Metallurgy Congress and Exhibition, Euro PM 2017
Y2 - 1 October 2017 through 4 October 2017
ER -