Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels |
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Authors: | I B Timokhina P D Hodgson E V Pereloma |
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Affiliation: | (1) Present address: the School of Engineering and Technology, Deakin University, 3217 Geelong, VIC, Australia;(2) the School of Physics and Materials Engineering, Monash University, 3800 VIC, Australia |
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Abstract: | Two Fe-0.2C-1.55Mn-1.5Si (in wt pct) steels, with and without the addition of 0.039Nb (in wt pct), 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. |
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