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On the Role of Chromium in Dynamic Transformation of Austenite
K. Chadha,Davood Shahriari,C. Jr. Aranas,Louis‑Philippe Lapierre‑Boire,Mohammad Jahazi 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3
The effect of Chromium (Cr) on the dynamic transformation (DT) of austenite to ferrite at temperatures up to 430 °C aboveAe3was studied in a medium-carbon low-alloy steel. Hot compression tests were performed using Gleeble 3800® thermomechanicalsimulator followed by microstructural examinations using electron microscopy (FESEM-EBSD). Driving forcecalculation using austenite flow stress and ferrite yield stress on an inverse absolute temperature graph indicated that Crincreases the driving force for the transformation of austenite to ferrite; however, when the influence of stress and thermodynamicanalysis are taken into account, it was observed that Cr increases the barrier energy and therefore, emerges as abarrier to the transformation. An analysis, based on lattice and pipe diffusion theories is presented that quantifies the role ofstress on the diffusivity of Cr and is compared with other the main alloying elements such as C, Si and Mn and its impact,positive or negative, on the DT barrier energy. Finally, a comparison is made on the differential effects of temperature andstress on the initiation of DT in medium-carbon low-alloy steels.