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Title: Development of ultra-fine grained dual-phase steels: Mechanism of grain refinement during inter-critical deformation
Authors: Karmakar, Anish
Misra R.D.K.
Neogy S.
Chakrabarti D.
Published in: Proceedings of Materials Science Forum
Abstract: Heavy deformation of metastable austenite (below Ae3) or both austenite and ferrite in the two-phase region (between Ar3 and Ar1) has been found to develop ultra-fine ferrite grain structures with average grain sizes less than 3 μm. The sequence of different dynamic softening mechanisms involved in the grain refinement during heavy intercritical deformation, such as, dynamic recovery, dynamic recrystallization, and dynamic strain induced austenite → ferrite transformation, has been analyzed by considering strain partitioning between austenite and ferrite. Grain refinement is expected to be dictated by dynamic strain induced transformation (DSIT) at higher deformation temperatures (>1100°C) and pronounced dynamic recovery of ferrite at lower deformation temperatures (<1100°C). Evolution of crystallographic texture was dependent on the grain refinement mechanism and gamma fiber components (ND//<111>) and alpha fiber components (RD//<110>) dominated the texture at higher and lower deformation temperatures, respectively. © (2014) Trans Tech Publications, Switzerland.
Citation: Proceedings of Materials Science Forum, (2014), 674- 678. Las Vegas, NV
Issue Date: 2014
Publisher: Trans Tech Publications Ltd
Keywords: Dual-phase steel
Dynamic recrystallization
Dynamic strain induced transformation
Strain partitioning
Ultra-fine grain
ISBN: 9.78E+12
ISSN: 2555476
Author Scopus IDs: 55510104200
Author Affiliations: Karmakar, A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology (I.I.T.), Kharagpur, West Bengal, 721 302, India
Misra, R.D.K., Laboratory for Excellence in Advanced Steel Research, Center for Structural and Functional Materials, University of Louisiana at Lafayette, P.O. Box 44130, Lafayette, LA 70504-4130, United States
Neogy, S., Materials Science Division, Bhabha Atomic Research Centre (BARC), 400 085, Mumbai, India
Chakrabarti, D., Department of Metallurgical and Materials Engineering, Indian Institute of Technology (I.I.T.), Kharagpur, West Bengal, 721 302, India
Appears in Collections:Conference Publications [MT]

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