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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Authors: | Sandeep Sangal Naresh C Goel Kris Tangri |
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Affiliation: | (1) Department of Mechanical Engineering, University of Manitoba, R3T 2N2 Winnipeg, MB, Canada |
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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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