Dependency of Deformation Behavior of Retained Aus

Authors: Ghavam Azizi Hamed Mirzadeh Mohammad Habibi Parsa

Publish Date: 2015/10/12

Volume: 28, Issue: 10, Pages: 1272-1277

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Abstract

The roomtemperature stability of the retained austenite against straininduced martensitic transformation its deformation behavior the response to the bainitic isothermal treatment the appearance of yield point elongation and other peculiarities of plastic flow and the mechanical properties of transformationinduced plasticity TRIP steel were tailored based on the chemical homogeneity and the relative distribution of the retained austenite bainite and ferrite in the microstructure The presence of ferriticpearlitic banded structure in the initial microstructure resulted in an inhomogeneous TRIP microstructure in which the retained austenite and bainite were confined to some bands and it was found to be responsible for the resultant inferior mechanical properties The appearance of discontinuous yielding for the chemically inhomogeneous material was related to the martensitic transformation of unstable retained austenite at the initial stage of tensile deformation These results are essential for better understanding of the behavior of advanced highstrength steels and their applications

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