TY - JOUR
T1 - Mechanical Behavior of Multi-Phase Steels Comprising Retained Austenite
AU - Perdahcıoğlu, Emin Semih
AU - Geijselaers, Hubert J.M.
N1 - Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Financial transaction number:
342200994
PY - 2022/1/10
Y1 - 2022/1/10
N2 - The retained austenite (RA) in advanced high-strength steel (AHSS) grades, such as dual-phase (DP) steels, plays an important role on their formability. Thanks to the transformation-induced plasticity (TRIP) effect that occurs during the mechanically induced transformation of RA into martensite, additional ductility is obtained. Martensite has a higher flow stress than austenite; hence, the transformation results in an apparent hardening, which is beneficial for the stability of deformation. The stability of RA at a given temperature strongly depends on its carbon content, which, in AHSS, is not uniform but distributed. The aim of this study is to build a model that predicts the transformation as well as TRIP in a DP steel grade with RA. A physics-based kinetic model is presented that captures the transformation of retained austenite based on the thermodynamic driving force of the applied stress. A direct analytical estimate of transformation plasticity is provided, which is consistent with the kinetic model. Transformation kinetics is incorporated in a self-consistent, mean-field homogenization-based constitutive model. Finally, an indication of the effect of transformation of retained austenite on formability is given.
AB - The retained austenite (RA) in advanced high-strength steel (AHSS) grades, such as dual-phase (DP) steels, plays an important role on their formability. Thanks to the transformation-induced plasticity (TRIP) effect that occurs during the mechanically induced transformation of RA into martensite, additional ductility is obtained. Martensite has a higher flow stress than austenite; hence, the transformation results in an apparent hardening, which is beneficial for the stability of deformation. The stability of RA at a given temperature strongly depends on its carbon content, which, in AHSS, is not uniform but distributed. The aim of this study is to build a model that predicts the transformation as well as TRIP in a DP steel grade with RA. A physics-based kinetic model is presented that captures the transformation of retained austenite based on the thermodynamic driving force of the applied stress. A direct analytical estimate of transformation plasticity is provided, which is consistent with the kinetic model. Transformation kinetics is incorporated in a self-consistent, mean-field homogenization-based constitutive model. Finally, an indication of the effect of transformation of retained austenite on formability is given.
KW - AHSS
KW - DP steel
KW - Formability
KW - Homogenization
KW - Martensitic phase transformation
KW - Self-consistent
KW - Transformation plasticity
KW - UT-Gold-D
UR - http://www.scopus.com/inward/record.url?scp=85122738087&partnerID=8YFLogxK
U2 - 10.3390/ma15020498
DO - 10.3390/ma15020498
M3 - Article
AN - SCOPUS:85122738087
SN - 1996-1944
VL - 15
JO - Materials
JF - Materials
IS - 2
M1 - 498
ER -