Kurup, VinodSiyasiya, Charles WitnessMostert, Roelf JohannesMoema, Joseph2022-11-212022-11-212021Kurup, V., Siyasiya, C.W., Mostert, R.J. 2021, 'Study of one-step and two-step quench and partition heat treatments on a medium carbon high silicon alloy using dilatometry', South African Journal of Science and Technology, vol. 40, no. 1, pp. 102-107, doi : 10.36303/SATNT.2021cosaami.20.0254-3486 (print)2222-4173 (online)10.36303/SATNT.2021cosaami.20https://repository.up.ac.za/handle/2263/88396This study evaluated the microstructural evolution in a medium carbon high silicon steel during one-step, and two-step quench and partition (Q&P) processes using dilatometry experiments. The two-step Q&P process was carried out using different quench temperatures ranging from 180 to 260 oC. In the one-step process, Q&P heat treatment samples were held isothermally for ten minutes after quenching at specified temperatures ranging between 200 and 450oC. The two-step Q&P process yielded a higher fraction of retained austenite than a one-step Q&P process. During the isothermal hold step, the volume expansion due to carbon partitioning and austenite decomposition behavior was interpreted by experimentally determined strain values. For the one-step Q&P process, the austenite decomposition kinetics above and below the Ms temperature differed, as evidenced by the JMAK parameters. The TTT diagram generated for the one-step Q & P process showed a “swing back” at a temperature of around 355oC.en© 2021, Suid-Afrikaanse Akademie vir Wetenskap en Kuns. All rights reserved.Quench and partitioningDilatometryMicrostructureBainiteEngineering, built environment and information technology articles SDG-04SDG-04: Quality educationEngineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-12SDG-12: Responsible consumption and productionEngineering, built environment and information technology articles SDG-13SDG-13: Climate actionStudy of one-step and two-step quench and partition heat treatments on a medium carbon high silicon alloy using dilatometryArticle