Modeling of high-temperature flow stress of VN and Nb-Ti microalloyed steels during hot compressive deformation

dc.contributor.authorChalimba, Stephen Akonda
dc.contributor.authorMostert, Roelf Johannes
dc.contributor.authorStumpf, Waldo E.
dc.contributor.authorSiyasiya, Charles Witness
dc.contributor.authorBanks, K.M. (Kevin)
dc.date.accessioned2020-04-03T08:10:44Z
dc.date.issued2020-01
dc.description.abstractA simple mathematical model has been developed which describes the flow curve behavior up to the peak true stress or a true strain of 0.6 in unstable austenite. The hot working behavior was analyzed by compression tests over a temperature range of 750–1000 °C and at strain rates of 0.1–50 s−1. The constitutive behavior focused on the interaction between work hardening and dynamic softening attributed to recovery, recrystallization and dynamic austenite to ferrite transformation. This model extends the application of the well-established Estrin and Mecking (EM) work-hardening model in the unstable austenite region. The work hardening is countered by softening kinetics, represented in this model by JMAK-type expressions for both dynamic transformation and recrystallization. The predicted results correlate well with experimental results in VN and Nb-Ti microalloyed steels.en_ZA
dc.description.departmentMaterials Science and Metallurgical Engineeringen_ZA
dc.description.embargo2021-01-09
dc.description.librarianhj2020en_ZA
dc.description.librarianmi2025en
dc.description.sdgSDG-07: Affordable and clean energyen
dc.description.sdgSDG-09: Industry, innovation and infrastructureen
dc.description.sdgSDG-12: Responsible consumption and productionen
dc.description.sdgSDG-13: Climate actionen
dc.description.sponsorshipThe University of Pretoria and technical support from the Industrial Minerals and Metals Research Institute (IMMRI).en_ZA
dc.description.urihttp://link.springer.com/journal/11665en_ZA
dc.identifier.citationChalimba, S.A.J., Mostert, R.J., Stumpf, W.E. et al. Modeling of High-Temperature Flow Stress of VN and Nb-Ti Microalloyed Steels during Hot Compressive Deformation. Journal of Materials Engineering and Performance 29, 330–341 (2020). https://doi-org/10.1007/s11665-019-04552-8.en_ZA
dc.identifier.issn1059-9495 (print)
dc.identifier.issn1544-1024 (online)
dc.identifier.other10.1007/s11665-019-04552-8
dc.identifier.urihttp://hdl.handle.net/2263/73918
dc.language.isoenen_ZA
dc.publisherSpringeren_ZA
dc.rights© ASM International. The original publication is available at : http://link.springer.comjournal/11665.en_ZA
dc.subjectDynamic recrystallizationen_ZA
dc.subjectDynamic transformationen_ZA
dc.subjectFlow stressen_ZA
dc.subjectHot rollingen_ZA
dc.subjectModelingen_ZA
dc.subject.otherEngineering, built environment and information technology articles SDG-07
dc.subject.otherSDG-07: Affordable and clean energy
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.subject.otherEngineering, built environment and information technology articles SDG-12
dc.subject.otherSDG-12: Responsible consumption and production
dc.subject.otherEngineering, built environment and information technology articles SDG-13
dc.subject.otherSDG-13: Climate action
dc.titleModeling of high-temperature flow stress of VN and Nb-Ti microalloyed steels during hot compressive deformationen_ZA
dc.typePostprint Articleen_ZA

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