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Lecture Thomas Pardoen


27 February 2004 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Thomas Pardoen
Affiliation: Materials Science and Processes Department, Unité PCIM, Université Catholique de Louvain, Belgium
Title: Multi-scale mechanics of TRIP-assisted multiphase steels
Date: Fri Feb 27, 2004
Start: 11.00
Location: FWN-Building 5114.0004
Host: P.R. Onck
Telephone: +31 50 363 8039


The mechanics of TRIP-aided multiphase steels is addressed using a multilevel micromechanics-based modelling approach. The stress and strain partitioning between the ferritic matrix, the retained austenite grains and the newly formed martensitic variants is measured by combining neutron diffraction experiments (for the stresses) and digital image correlation (for the strains). The composite response is modelled using a mean field Eshelby-type homogenization scheme. The change of the austenite volume fraction under straining is predicted using Fischer's transformation criterion properly modified to account for small, isolated, transforming austenite grains. The parameters of the model are identified from the mechanical response and austenite evolution obtained under uniaxial tension for two steels differing essentially by the austenite stability. The model is validated by comparing the predictions with tests performed under different loading conditions : pure shear, recessing and biaxial. An analysis of the effect of the austenite stability on the strength and ductility provides guidelines to optimize properties as a function of the stress state.
Last modified:22 October 2012 2.30 p.m.