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Mechanism of ultra-fine microstructure formation during ART-annealing of a Medium-Mn steel

Abstract : The medium Mn steels are a topic of interest from both practical and scientific point of view. Many studies were focused on the microstructure characterization, but only some of them addressed the mechanisms of austenite formation and stabilization. Hence, there are still remaining questions regarding the link between the optimum retained austenite fraction and stability and the austenite formation including both the morphological and kinetics aspects. In this work, different ART annealing treatments were performed on a cold rolled 0.1C – 4.7Mn (wt.%) steel. SEM and TEM observations as well as XRD and magnetic measurements were done to characterize the resulting microstructures. Microstructure evolution was analyzed as a function of soaking time: precipitation and dissolution of cementite; austenite nucleation, growth and stabilization. The experimental observations were compared with the predictions from thermodynamic calculations. Based on the obtained results, a mechanism of austenite formation and stabilization during ART annealing is proposed.
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Submitted on : Monday, April 24, 2017 - 4:34:45 PM
Last modification on : Saturday, June 19, 2021 - 3:10:55 AM

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  • HAL Id : hal-01513120, version 1

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Artem Arlazarov, Mohamed Gouné, Alain Hazotte, Olivier Bouaziz, Fréderic Kegel. Mechanism of ultra-fine microstructure formation during ART-annealing of a Medium-Mn steel. PTM 2015 - International conference on solid-solid phase transformations in inorganic materials, Jun 2015, Whistler, Canada. ⟨hal-01513120⟩

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