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Micromechanical Modeling and Investigating the Effect of Particle Size and the Interface of Phases on the Mechanical Behavior of Dual-Phase Steels

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Abstract

Dual-phase (DP) ferrite–martensite steels have a fine microstructure that consist of martensite islands, dispersed in a ferrite matrix. In the present work, a micromechanical-based finite element (FE) analysis is carried out in order to investigate the mechanical properties of this type of steels, such as yield stress and tensile strength. The step forward contribution of the present study is to insert the effect of the presence of the interface of the constituting phases in the FE model. In order to do so, a micromechanical FE model is developed in which the effect of the interface of the constituting phases is taken into account by means of cohesive elements. The required parameters of the cohesive elements are determined by a trial and error procedure which compares the numerical results to the experimental ones. Experimental data is used to verify the created FE model. This model is then used to investigate the effect of martensite volume fraction and small-to-large particle size ratio of martensite on the deformation behavior of the DP steel. This study shows that considering the interface of the constituting phases greatly affects the numerical results on stress and strain distributions and produces more realistic findings in agreement with experiments. The results show that applying cohesive elements between two phases have reduced tensile strength, yield stress, and the amount of uniform elongation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran

    Alireza Fallahi Arezodar

  2. New Technologies Research Center (NTRC), Amirkabir University of Technology, Tehran, Iran

    Ali Nikbakht

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  1. Alireza Fallahi Arezodar
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  2. Ali Nikbakht
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Correspondence to Alireza Fallahi Arezodar.

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Fallahi Arezodar, A., Nikbakht, A. Micromechanical Modeling and Investigating the Effect of Particle Size and the Interface of Phases on the Mechanical Behavior of Dual-Phase Steels. J. of Materi Eng and Perform 28, 53–62 (2019). https://doi.org/10.1007/s11665-018-3768-x

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  • DOI: https://doi.org/10.1007/s11665-018-3768-x

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