Quantification of TRIP Kinetics in Medium Mn Steels by in-situ Magnetic Measurements
Résumé
Increasing interest of the automotive industry in light, high strength – high formability steels has led to the development of a third generation of advanced high strength steels (AHSS). So-called Medium-Mn alloys belong to this generation of steel. Medium-Mn alloys are ultra-fine-grained dual phase steels containing a mixture of ferrite and retained austenite. The stability of the retained austenite controls the degree to which transformation induced plasticity (TRIP) or twinning induced plasticity (TWIP) may be observed. In the current study Medium-Mn alloys of varying degrees of austenite stability are studied, all of which exhibit the TRIP deformation mechanism. The kinetics of the phase transformation are evaluated by using in-situ measurements of the magnetic properties of a sample to determine the volume fraction of retained austenite as a function of the plastic strain during tensile testing. Results are compared to phase volume fraction measurements made by X-ray diffraction (XRD). The magnetic measurement is shown to be as robust as XRD while providing a much richer data set with a shorter overall experiment duration.
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