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Atomistic Approach in Steel Transformation


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Chadha, Kanwal and Jahazi, Mohammad. 12 March 2019. « Atomistic Approach in Steel Transformation ». [Research article]. Substance ÉTS.

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The dynamic transformation (DT) of austenite to a ferrite phase at high temperatures was studied in a medium-carbon low-alloy steel. The study involved hot compression tests followed by microstructural examinations using electron microscopy. Mathematical calculation of the data indicated that Cr atoms increase the driving force for the transformation of austenite to ferrite. However, when the influences of stress and thermodynamic analysis were considered, it was observed that Cr increased the barrier energy and therefore, emerged as a barrier to the transformation. An in-depth atomic analysis, based on lattice and pipe diffusion theories quantifies the role of stress on the diffusivity of Cr and is compared with other main alloying elements, such as C, Si, and Mn, and its impact, positive or negative, on the DT barrier energy. Finally, a comparison was made regarding the differential effects of temperature and stress on the initiation of DT in medium-carbon low-alloy steels.

Item Type: Non-peer reviewed article published in a journal or magazine
Refereed: No
Jahazi, Mohammad
Affiliation: Génie mécanique
Date Deposited: 26 Mar 2019 16:08
Last Modified: 27 Mar 2019 14:22

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