This paper focuses on micromechanical finite element (FE) modeling of the effects of size and morphology (particularly elongation or aspect ratio (AR) along the loading direction) of martensite particles and the ferrite grains on the overall mechanical behavior of dual-phase (DP) steels. To capture the size-effect of the martensite particles and ferrite grains, the core and mantle approach is adapted in which a thin interphase of geometrically necessary dislocations (GNDs) is embedded at the martensite–ferrite boundaries. It is shown that as the martensite particles size decreases or their aspect ratio increases, both the strength and ductility of DP steel increase simultaneously. On the other hand, as the ferrite grain size decreases or its aspect ratio increases, the overall strength increases on the expense of the ductility. The conclusions from this study can be used in guiding the microstructural design of DP steels.
Micromechanical Finite Element Analysis of the Effects of Martensite Particle Size and Ferrite Grain Boundaries on the Overall Mechanical Behavior of Dual Phase Steel
Mechanical and Materials
Masdar Institute of Science and Technology,
Abu Dhabi 54224, UAE;
Montreal, QC H3A 0C3, Canada
Air Force Institute of Technology,
WPAFB, OH 45433-7765
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received October 17, 2015; final manuscript received March 23, 2017; published online May 25, 2017. Assoc. Editor: Mohammed Zikry.
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Abid, N. H., Abu Al-Rub, R. K., and Palazotto, A. N. (May 25, 2017). "Micromechanical Finite Element Analysis of the Effects of Martensite Particle Size and Ferrite Grain Boundaries on the Overall Mechanical Behavior of Dual Phase Steel." ASME. J. Eng. Mater. Technol. October 2017; 139(4): 041006. https://doi.org/10.1115/1.4036687
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