Mechanical properties, formability and corrosion resistance of thermomechanically controlled processed Ti-Nb stabilized {IF} steel

By Ghosh, Sumit; Singh, Ajay Kumar; Mula, Suhrit; Chanda, Prasenjit; Mahashabde, Vinay V.; Roy, T. K.
Published in Materials Science and Engineering: A NULL 2017

Abstract

Abstract Aim of the present study is to examine the possibilities of achieving a better combination of yield strength (YS), ductility and formability with a better corrosion resistance of a Ti-Nb stabilize {IF} steel through microstructural refinement by simple phase controlled thermomechanical rolling. The phase controlled thermomechanical rolling could be an industrially reliable method for the production of hot strips, which can substitute cold rolled steel sheets. Accordingly, the phase controlled multi-pass rolling was performed in 3 selected phase regimes (?-recrystallization, ??? transition & ?-regions) on the basis of Ac3/Ar3, Ac1/Ar1 (obtained through Thermo-Calc & Gleeble-3800) and Tnr (from Boratto equation) followed by air cooling. The volume fraction of precipitate(s) correspond to the deformation temperature was estimated using Thermo-Calc Software and the morphology of the precipitates was analyzed by TEM. The strain induced phase transformation of unstable ? occurred during rolling at a high reduction of 80%, ?=1.6 at ??? transition region. Thus, dynamically recovered stable bimodal equiaxed ferrite structures (fine ferrite 5

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