Evolution of flow stress and microstructure during isothermal compression of Waspaloy

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DOIResolve DOI: http://doi.org/10.1016/j.msea.2014.07.093
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TypeArticle
Journal titleMaterials Science and Engineering A
ISSN0921-5093
Volume615
Pages497510; # of pages: 14
SubjectWaspaloy; Isothermal hot compressions; Friction; Adiabatic heating; Flow stress; Microstructure
AbstractThe evolution of the flow stress and microstructure for Waspaloy was studied in the 950-1140°C temperature range under constant true strain rate conditions of 0.001-1s-1 up to a true strain of 0.83 using isothermal hot compression testing. The impact of friction at the sample/anvil interface and adiabatic heating during deformation on the flow stress evolution was also examined. Mathematical models relating the flow stress to the deformation temperature and strain rate were derived using a power-law relationship. The strain rate sensitivity and the activation energy for hot deformation of Waspaloy were found to be considerably different for deformation in the subsolvus and supersolvus temperature ranges. According to the microstructural investigations, at 950°C dynamic recovery (DRV) was the main softening mechanism. By contrast, dynamic recrystallization (DRX), partial or complete, occurred at temperatures above 950°C and resulted in flow softening.
Publication date
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number21272934
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Record identifier817e8aa5-ae1b-4d22-b189-c3e4ceca0f91
Record created2014-12-03
Record modified2016-05-09
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