Thermo-Mechanical Behaviour of Dual-Phase Steels in Various Structural Morphologies: Experiments and Modelling

Abstract:

The thermo-mechanical behaviour of the hot rolled dual-phase steel 10MnSi7 has been determined as a function of temperature and time within the two-phase field α+γ as well as at lower deformation temperatures down to Ms-temperature. The corresponding microstructures, phase hardness, state of recrystallisation have been determined using quantitative metallography. Using this information, a finite element model of a representative volume element (RVE) has been set up. Each element represents a subdomain of a grain that transforms according to the kinetics found in the measurements. The RVE has been subjected to the same loading history as in the accompanying experiments and the overall stress-strain response is monitored during ongoing transformation. The effect of a preferred orientation of the two phase structure has been studied taking into account the effects of a significant plastic deformation. The model is validated by comparison with the experimental evidence.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 2072-2077
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.2072
• Online since: January 2012
• Authors: Bruno Buchmayr, Thomas Antretter
• Keywords: Dual Phase Steel, Ferrite Morphology, Flow Curve, Gleeble, Representative Volume Element (RVE) Approach, Servotest-Machine, Thermo-Mechanical Processing, Transformation Kinetics

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