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A theoretical model for the flow behavior of commercial dual-phase steels containing metastable retained austenite: Part II. calculation of flow curves

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Abstract

The role of metastable retained austenite(γ R), its volume fraction, and mechanical stability on the flow characteristics of a dual phase steel containing 20 vol pct of ‘as quenched’ martensite in a ferrite matrix has been examined in this paper employing the flow curve expressions derived in Part I of this paper. It has been found that for a given volume fraction ofγ R, its mechanical stability plays a crucial role in enhancing the ductility. Whereas highly stableγ R does not contribute either to strength or ductility of the steel, highly unstableγ R which causes an increase in the strength is detrimental to ductility. Aγ R which is moderately stable and undergoesγ R → α′ transformation over a larger strain range is beneficial to enhanced ductility. Increasing amounts of moderately stableγ R significantly increase both the strength and the ductility of dual-phase steels through a sustained work-hardening due toγ R → α′ transformation. Load transfer which is determined by a parameterq has a significant contribution to work-hardening. A value of ∣|q∣|= 4500 MPa has been found to partition realistically the stress and strain in these steels.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Manitoba, R3T 2N2, Winnipeg, MB, Canada

    Sandeep Sangal (Graduate Student), Naresh C. Goel (Research Associate) & Kris Tangri (Professor of Metallurgy)

Authors
  1. Sandeep Sangal
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  2. Naresh C. Goel
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  3. Kris Tangri
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Sangal, S., Goel, N.C. & Tangri, K. A theoretical model for the flow behavior of commercial dual-phase steels containing metastable retained austenite: Part II. calculation of flow curves. Metall Trans A 16, 2023–2029 (1985). https://doi.org/10.1007/BF02662403

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