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Micromechanical Finite Element Analysis of the Effects of Martensite Particle Size and Ferrite Grain Boundaries on the Overall Mechanical Behavior of Dual Phase Steel

[+] Author and Article Information
Najmul H. Abid

Department of Mechanical Engineering, McGill University, Montreal, Canada
najmul.abid@mail.mcgill.ca

Rashid K. Abu Al-Rub

Institute Center for Energy, Mechanical and Materials Engineering Department, Masdar Institute of Science and Technology, Abu Dhabi, UAEMechanical Engineering Department, Khalifa University of Science and Technology, Abu Dhabi, UAE
rabualrub@masdar.ac.ae

Anthony Palazotto

Department of Aeronautics and Astronautics, Air Force Institute of Technology, WPAFB, OH 45433-7765
palazotto@sbcglobal.net

1Corresponding author.

ASME doi:10.1115/1.4036687 History: Received October 17, 2015; Revised March 23, 2017

Abstract

This paper focuses on micromechanical finite element modeling the effects of size and morphology (particularly elongation or aspect ratio along the loading direction) of martensite particles and the ferrite grains on the overall mechanical behavior of dual-phase 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 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 dual-phase steels.

Copyright (c) 2017 by ASME
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