Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels
Timokhina, Ilana, Hodgson, Peter and Pereloma, E.V. 2004, Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels, Metallurgical and materials transactions. A, Physical metallurgy and materials science, vol. 35A, no. 8, pp. 2331-2341.
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Two Fe-0.2C-1.55Mn-1.5Si (in wt pet) steels, with and without the addition of 0.039Nb (in wt pet), were studied using laboratory rolling-mill simulations of controlled thermomechanical processing. The microstructures of all samples were characterized by optical metallography, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The microstructural behavior of phases under applied strain was studied using a heat-tinting technique. Despite the similarity in the microstructures of the two steels (equal amounts of polygonal ferrite, carbide-free bainite, and retained austenite), the mechanical properties were different. The mechanical properties of these transformation-induced-plasticity (TRIP) steels depended not only on the individual behavior of all these phases, but also on the interaction between the phases during deformation. The polygonal ferrite and bainite of the C-Mn-Si steel contributed to the elongation more than these phases in the C-Mn-Si-Nb-steel. The stability of retained austenite depends on its location within the microstructure, the morphology of the bainite, and its interaction with other phases during straining. Granular bainite was the bainite morphology that provided the optimum stability of the retained austenite.
Copyright 2004 ASM International. This paper was published in Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 35A, Issue 8, pp. 2331-2341 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.
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