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High‐Temperature Deformation Behavior of a Novel Hot‐Rolled Transformation‐Induced Plasticity Alloy: Experiments, Constitutive Modeling, and Processing Maps
Author(s) -
Zhang Bin,
Dong Ying,
Devesh Kumar Misra Raja,
Liu Yue,
Sun Chao,
Du Lin Xiu
Publication year - 2021
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.202000338
Subject(s) - materials science , dynamic recrystallization , strain rate , flow stress , plasticity , deformation (meteorology) , deformation mechanism , composite material , grain boundary , constitutive equation , atmospheric temperature range , recrystallization (geology) , metallurgy , hot working , alloy , thermodynamics , microstructure , finite element method , biology , paleontology , physics
Hot deformation behavior of a novel hot‐rolled transformation‐induced plasticity (TRIP) alloy is studied by compression test in the temperature range of 1123–1323 K and strain rate range of 0.1–10 s −1 , and the relation between flow stress and Zener–Hollomon parameter is systematically analyzed. The study indicates that the flow stress of experimental alloy increases with the decrease in deformation temperature and increase in strain rate. The value of stress exponent ( n ) and activation energy ( Q ) is 7.4 and 323.5 kJ mol −1 . Processing maps developed using the dynamic material model at strains of 0.25, 0.40, and 0.55 predict optimum hot deformation temperature of 1273 K and strain rate of 0.8 s −1 . The study of dynamic recrystallization (DRX) behavior under different deformation conditions by transmission electron microscope (TEM) suggests that two DRX mechanisms are operative—continuous dynamic recrystallization (CDRX) mechanism, which depends on high density of dislocations at the grain boundaries, and the second mechanism involves strain‐induced boundary migration (SIBM), governed by grain boundary bulging.