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Characterization of the Hot Deformation Behavior and Microstructure Evolution of a New γ-γ′ Strengthened Cobalt-Based Superalloy

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cris.author.scopus-author-id56449406000
cris.author.scopus-author-id55555141500
cris.author.scopus-author-id6603383942
cris.virtual.author-orcid#PLACEHOLDER_PARENT_METADATA_VALUE#
cris.virtual.author-orcid#PLACEHOLDER_PARENT_METADATA_VALUE#
cris.virtual.author-orcid0000-0002-5198-317X
cris.virtual.department#PLACEHOLDER_PARENT_METADATA_VALUE#
cris.virtual.department#PLACEHOLDER_PARENT_METADATA_VALUE#
cris.virtual.departmentIndian Institute of Technology, Madras
cris.virtualsource.author-orcid#PLACEHOLDER_PARENT_METADATA_VALUE#
cris.virtualsource.author-orcid#PLACEHOLDER_PARENT_METADATA_VALUE#
cris.virtualsource.author-orcid3c3296e4-82be-42b6-b03b-51de524dff7d
cris.virtualsource.department#PLACEHOLDER_PARENT_METADATA_VALUE#
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cris.virtualsource.department3c3296e4-82be-42b6-b03b-51de524dff7d
dc.contributor.authorNithin, B.
dc.contributor.authorChattopadhyay, K.
dc.contributor.authorPhanikumar, G.
dc.date.accessioned2023-09-19T13:38:34Z
dc.date.available2023-09-19T13:38:34Z
dc.date.issued01-10-2018
dc.description.abstractRecently, cobalt-based γ-γ′ microstructured superalloys have attracted attention. However, studies on their processing behavior [i.e., processing maps (the variation of strain rate sensitivity (m) with temperature)] are limited. Thus, the high-temperature flow behavior of a γ-γ′ Co-30Ni-10Al-5Mo-2Ta-2Ti-5Cr (at. pct) superalloy was investigated using isothermal compression tests between 1348 and 1498 K at strain rates from 0.001 to 10 s−1. The m contour map was generated using the experimental flow stress values, which were used to locate the optimum hot workability and desired microstructural processing range. A strong dependence of m on the deformation parameters (temperature, strain rate, and strain) was observed. A maximum m value of around 0.3 at 1460 K to 1498 K and strain rates of 0.01 to 0.5 s−1 was found. The deformed samples show a fully recrystallized microstructure at high m. Unstable domains showed the formation of cavities at the grain boundary triple points and cracks along the grain boundaries at high strain rates (1 to 10 s−1), corresponding to m < 0.10. A constitutive model was developed using an Arrhenius hyperbolic sine function, yielding an apparent activation energy of 540 ± 30 kJ mol−1 for hot deformation. This study indicates reasonable formability under certain conditions below the solvus, thus opening possibilities for further thermomechanical treatment.
dc.identifier.doi10.1007/s11661-018-4795-9
dc.identifier.issn10735623
dc.identifier.scopus2-s2.0-85049650819
dc.identifier.urihttps://apicris.irins.org/handle/IITM2023/22517
dc.relation.ispartofseriesMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
dc.sourceMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
dc.titleCharacterization of the Hot Deformation Behavior and Microstructure Evolution of a New γ-γ′ Strengthened Cobalt-Based Superalloy
dc.typeJournal
dspace.entity.typePublication
oaire.citation.endPage4905
oaire.citation.issue10
oaire.citation.startPage4895
oaire.citation.volume49
oairecerif.author.affiliation#PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliation#PLACEHOLDER_PARENT_METADATA_VALUE#
oairecerif.author.affiliationIndian Institute of Technology, Madras
person.affiliation.cityChennai
person.affiliation.cityBengaluru
person.affiliation.id60025757
person.affiliation.id60014097
person.affiliation.nameIndian Institute of Technology Madras
person.affiliation.nameIndian Institute of Science
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