Constitutive Modeling of the Stacking Fault Energy-Dependent Deformation Behavior of Fe-Mn-C-(Al) TWIP Steels
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winning-induced plasticity (TWIP) steels are characterized by both high strength and superb formability.[1,2] Deformation mechanisms of TWIP steels such as deformation twinning and deformation-induced martensitic transformation are known to be greatly affected by their stacking fault energy (SFE).[3–5] In TWIP steels with a Mn content ranging from 15 to 30 wt pct, alloying elements such as C,[6] Mn,[7] and Al[4,8] raise the SFE. The SFE-dependent deformation mechanisms and mechanical properties of Fe-xMn-0.6C-yAl TWIP steels with a chemical composition range of 12 to 18 wt pct Mn and 0 to 3 wt pct Al were investigated in an earlier work.[5] There has been extensive research on the constitutive modeling of the mechanical properties of TWIP
JIN-KYUNG KIM is with the Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 37673, South Korea and also with the Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, South Korea. Conatct e-mail: [email protected] BRUNO C. DE COOMAN is with the Graduate Institute of Ferrous Technology, Pohang University of Science and Technology and also with the NLMK Group, Moscow, Russia 119017. YURI ESTRIN is with the Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia and also with the Institute of Materials Engineering, TU Bergakademie Freiberg, 09599 Freiberg, Germany Manuscript submitted May 30, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS A
steels.[9–24] Two types of models have been proposed to explain the enhancement of strain hardening of TWIP steels due to deformation twinning:[25] (1) isotropic strain hardening by the ‘‘dynamic Hall–Petch effect,’’[9] (2) kinematic hardening by the back-stress effect.[10] Despite considerable effort with modeling in the past, most theoretical work has addressed a single TWIP steel composition and only a few models account for the effect of alloying elements on the mechanical properties of TWIP steels in a quantitative way.[13,15,26] Kang et al.[15] proposed a constitutive model based on the Kocks-Mecking approach[27] and on that basis described the composition and temperature-dependent tensile behavior of Fe-Mn-C TWIP steels with a composition range of 18 to 24 wt pct Mn and 0.5 to 0.7 wt pct C. Huang et al.[26] proposed a micromechanical model considering both TWIP and transformation-induced plasticity (TRIP) effects that provided a description of the deformation behavior of Fe-(22-26Mn)-0.12C (wt pct) and Fe-22Mn-(0.2-0.6C) (wt pct) steels. In addition, the constitutive models that consider SFE as an input parameter are rather scarce. A model of notice was proposed by Wong et al.[23] who used the SFE as a temperature-dependent input parameter to describe the deformation behavior of a Fe-22Mn-0.6C steel in the temperature range of 123 K to 773 K. The present work aims at applying our constitutive model proposed for Fe-18Mn-0.6C-(1.5Al) (wt pct) TWIP steel[12,13] to a leaner Fe-15Mn-0.6C-(1.5Al) (wt pct) TWIP steel. While t
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