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Physically Based Model for Static and Dynamic Behaviour of TRIP Steel

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Abstract:

Low alloy multiphase TRansformation Induced Plasticity (TRIP) steels offer an excellent combination of a large uniform elongation and a high strength. This results from the composite behaviour of the different phases that are present in these steels: polygonal ferrite, bainitic ferrite and a martensite/austenite constituent. In order to obtain a clear understanding of the behaviour of the different constituents within the multiphase steel, they were prepared separately. The stress-strain relationship of the different single phase and multiphase steels were simulated with physically based micromechanical models. The model used to describe the stress-strain curves of the separate phases is based on the Mecking-Kocks and Seeger-Kocks theories and uses physical properties such as the microstructural properties and the chemical composition of the different phases. Strain-induced transformation kinetics, based on a generalized form of the Olson-Cohen law, were used to include the influence of the transformation of the metastable austenite. Static stress-strain properties of multiphase steels were modelled by the successive application of a Gladman type mixture law for two-phase steels. The model yields detailed information of stress and strain partitioning between the different phases during a static tensile test. A model for the dynamic stress-strain properties of ferritic steels is also proposed.

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Periodical:

Advanced Materials Research (Volumes 15-17)

Pages:

744-749

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.15-17.744

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Online since:

February 2006

Authors:

Jérémie Bouquerel, Kim Verbeken, Bruno C. De Cooman, Yvan Houbaert, Patricia Verleysen, Joost Van Slycken

Keywords:

High Strain Rate, Mecking-Kocks, Modeling, Seeger Kocks, TRIP Steel

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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