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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/18102
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dc.contributor.authorKarmakar, Anish-
dc.contributor.authorSivaprasad S.-
dc.contributor.authorNath S.K.-
dc.contributor.authorMisra R.D.K.-
dc.contributor.authorChakrabarti D.-
dc.date.accessioned2020-12-03T03:18:33Z-
dc.date.available2020-12-03T03:18:33Z-
dc.date.issued2014-
dc.identifier.citationProceedings of Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, (2014), 2466- 2479-
dc.identifier.issn10735623-
dc.identifier.urihttps://doi.org/10.1007/s11661-014-2184-6-
dc.identifier.urihttp://repository.iitr.ac.in/handle/123456789/18102-
dc.description.abstractA comparative study was carried out on the development of ultrafine-grained dual-phase (DP) (ferrite-martensite) structures in a low-carbon microalloyed steel processed using two thermomechanical processing routes, (i) intercritical deformation and (ii) warm-deformation and intercritical annealing. The samples were deformed using Gleeble3500® simulator, maintaining a constant total strain (ε = 1) and strain rate (ε ̇ = 1/s). Evolution of microstructure and micro-texture was investigated by SEM, TEM, and EBSD. Ultrafine-grained DP structures could be formed by careful selection of deformation temperature, T def (for intercritical deformation) or annealing temperature, T anneal (for warm-deformation and annealing). Overall, the ferrite grain sizes ranged from 1.5 to 4.0 μm, and the sizes and fractions of the uniformly distributed fine-martensitic islands ranged from 1.5 to 3.0 μm and 15 to 45 pct, respectively. Dynamic strain-induced austenite-to-ferrite transformation followed by continuous (dynamic) recrystallization of the ferrite dictated the grain refinement during intercritical deformation, while, continuous (static) recrystallization by pronounced recovery dictated the grain refinement during the warm-deformation and the annealing. Regarding intercritical deformation, the samples cooled to T def indicated finer grain size compared with the samples heated to T def, which are explained in terms of the effects of strain partitioning on the ferrite and the heating during deformation. Alpha-fiber components dominated the texture in all the samples, and the fraction of high-angle boundaries (with >15 deg misorientation) increased with the increasing T def or T anneal, depending on the processing schedule. Fine carbide particles, microalloyed precipitates and austenitic islands played important roles in defining the mechanism of grain refinement that involved retarding conventional ferrite recrystallization and ferrite grain growth. With regard to the intercritical deformation, warm-deformation followed by annealing is a simpler process to control in the rolling mill; however, the need for high-power rolling mill and controlled annealing facility imposes industrial challenges. © 2014 The Minerals, Metals & Materials Society and ASM International.-
dc.language.isoen_US-
dc.publisherSpringer Boston-
dc.relation.ispartofProceedings of Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science-
dc.subjectAnnealing-
dc.subjectAustenitic transformations-
dc.subjectDynamic recrystallization-
dc.subjectFerrite-
dc.subjectGrain growth-
dc.subjectGrain refinement-
dc.subjectGrain size and shape-
dc.subjectMartensitic transformations-
dc.subjectMicrostructural evolution-
dc.subjectRolling mills-
dc.subjectStrain rate-
dc.subjectTextures-
dc.subjectAnnealing temperatures-
dc.subjectAustenite-to-ferrite transformation-
dc.subjectDeformation temperatures-
dc.subjectFerrite grain growth-
dc.subjectHigh angle boundaries-
dc.subjectIndustrial challenges-
dc.subjectIntercritical annealing-
dc.subjectThermo-mechanical processing-
dc.subjectDeformation-
dc.titleComparison between different processing schedules for the development of ultrafine-grained dual-phase steel-
dc.typeConference Paper-
dc.scopusid55510104200-
dc.scopusid6602795640-
dc.scopusid7102759700-
dc.scopusid7203050969-
dc.scopusid12792743400-
dc.affiliationKarmakar, A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology (IIT) Kharagpur, Kharagpur 721 302 West Bengal, India-
dc.affiliationSivaprasad, S., National Metallurgical Laboratory, Council of Scientific and Industrial Research (CSIR-NML), Jamshedpur 831 007 Jharkhand, India-
dc.affiliationNath, S.K., Department of Metallurgical and Materials Engineering, Indian Institute of Technology (IIT) Roorkee, Roorkee 247 667 Uttarakhand, India-
dc.affiliationMisra, R.D.K., Center for Structural and Functional Materials, University of Louisiana, Lafayette Madison Hall, P.O. Box 44130, Lafayette LA 70504-4130, United States-
dc.affiliationChakrabarti, D., Department of Metallurgical and Materials Engineering, Indian Institute of Technology (IIT) Kharagpur, Kharagpur 721 302 West Bengal, India-
dc.description.fundingANISH KARMAKAR, Ph.D. Student, and DEBALAY CHAKRABARTI, Associate Professor, are with the Department of Metallurgical and Materials Engineering, Indian Institute of Technology (IIT) Kharagpur, Kharagpur 721 302, West Bengal, India. Contact e-mail: debalay@metal.iitkgp.ernet.in S. SIVAPRASAD, Scientist, is with the National Metallurgical Laboratory, Council of Scientific and Industrial Research (CSIR-NML), Jamshedpur 831 007, Jharkhand, India. S.K. NATH, Professor, is with the Department of Metallurgical and Materials Engineering, Indian Institute of Technology (IIT) Roorkee, Roorkee 247 667, Uttarakhand, India. R.D.K. MISRA, Professor of Chemical Engineering, Director, is with the Center for Structural and Functional Materials, University of Louisiana at Lafayette, Madison Hall, Room 217M, P.O. Box 44130, Lafayette, LA 70504-4130. Manuscript submitted May 22, 2013. Article published online January 24, 2014;The financial support from the Council of Scientific and Industrial Research (CSIR), New Delhi is duly acknowledged. One of the authors (RDKM) gratefully acknowledges the support from the Center for Structural and Functional Materials, University of Louisiana at Lafayette, U.S.A. for TEM studies.-
dc.description.correspondingauthorChakrabarti, D.; Department of Metallurgical and Materials Engineering, Indian Institute of Technology (IIT) Kharagpur, Kharagpur 721 302 West Bengal, India; email: debalay@metal.iitkgp.ernet.in-
Appears in Collections:Conference Publications [MT]

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