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Microstructure and Mechanical Properties of V-Nb Microalloyed Ultrafine-Grained Dual-Phase Steels Processed Through Severe Cold Rolling and Intercritical Annealing
Published in Springer Boston
2017
Volume: 48
   
Issue: 3
Pages: 1176 - 1188
Abstract
Ultrafine-grained (UFG) dual-phase (DP) steel was produced by severe cold rolling (true strain of 2.4) and intercritical annealing of a low carbon V-Nb microalloyed steel in a temperature range of 1003 K to 1033 K (730 °C to 760 °C) for 2 minutes, and water quenching. The microstructure of UFG DP steels consisted of polygonal ferrite matrix with homogeneously distributed martensite islands (both of size <1 µm) and a small fraction of the inter lath films of retained austenite. The UFG DP steel produced through intercritical annealing at 1013 K (740 °C) has good combination of strength (1295 MPa) and ductility (uniform elongation, 13 pct). The nanoscale V- and Nb-based carbides/carbonitrides and spheroidized cementite particles have played a crucial role in achieving UFG DP microstructure and in improving the strength and work hardening. Analysis of work hardening behavior of the UFG DP steels through modified Crussard–Jaoul analysis showed a continuously varying work hardening rate response which could be approximated by 2 or 3 linear regimes. The transmission electron microscopy analysis on post tensile-tested samples indicated that these regimes are possibly related to the work hardening of ferrite, lath, and twin martensite, respectively. © 2016, The Minerals, Metals & Materials Society and ASM International.
About the journal
JournalData powered by TypesetMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
PublisherData powered by TypesetSpringer Boston
ISSN10735623
Open AccessNo
Concepts (23)
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    Annealing
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    Carbides
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    Carbon
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    Cold rolling
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    Ferrite
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    Hardening
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    High resolution transmission electron microscopy
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    Martensite
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    Martensitic steel
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    Microalloying
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    Microstructure
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    Niobium alloys
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    Strain hardening
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    Transmission electron microscopy
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    INTERCRITICAL ANNEALING
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    Microstructure and mechanical properties
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    NB MICROALLOYED STEELS
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    POLYGONAL FERRITE MATRIXES
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    SPHEROIDIZED CEMENTITE
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    Transmission electron
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    ULTRA-FINE GRAINED ( UFG)
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    WORK HARDENING BEHAVIORS
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    Low carbon steel