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Correlation of Tensile Properties and Strain Hardening Behavior with Martensite Volume Fraction in Dual-Phase Steels

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Abstract

In the present study, tensile properties, strain hardening and fracture behavior of dual-phase (DP) steels were correlated with martensite volume fraction (V M ). A series of DP steels with different amounts of V M (28–50 %) were produced by cold rolling and subsequent intercritical annealing of a ferrite-pearlite starting structure. Hardness and tensile tests results of DP steels showed that variation of hardness, uniform elongation and total elongation with V M was linear and obeyed the rule of mixtures, whereas yield strength and ultimate tensile strength exhibited a nonlinear variation with V M . Analysis of strain hardening behavior of DP steels by the Hollomon analysis showed two stages of strain hardening corresponding to ferrite deformation and co-deformation of ferrite and martensite, respectively. The strain hardening exponent of first stage (n I ) increased with increasing V M , while the strain hardening exponent of second stage (n II ) as well as transition strain between the deformation stages decreased.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    H. Ashrafi, M. Shamanian, R. Emadi & N. Saeidi

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  1. H. Ashrafi
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  2. M. Shamanian
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  3. R. Emadi
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Correspondence to H. Ashrafi.

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Ashrafi, H., Shamanian, M., Emadi, R. et al. Correlation of Tensile Properties and Strain Hardening Behavior with Martensite Volume Fraction in Dual-Phase Steels. Trans Indian Inst Met 70, 1575–1584 (2017). https://doi.org/10.1007/s12666-016-0955-z

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  • DOI: https://doi.org/10.1007/s12666-016-0955-z

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