|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Hume-Rothery Award Symposium: Alloy Phase Chemistry at the Atomic Level - Opportunities and Challenges
||Atomistic Modelling of Carbon Redistribution in Martensite Phase
||Helena Zapolsky, Mykola Lavrskyi, Armen Khachaturyan, Frederic Danoix, Renaud Patte, Sophie Cazottes, Mohamed Gouné, Philippe Maugis
|On-Site Speaker (Planned)
Among various forms of steels, martensite obtained by quenching of the fcc austenite is the one with the highest strength. However, iron carbon martensite is not stable at room temperature and forms compositional modulations during aging. Although the morphology of this modulated microstructure was a subject of extensive experimental study the inter structure of the carbon-rich zones remains an open question. In this study we employ the Atomic Density Function theory (ADF) to model the low temperature kinetics of carbon redistribution in Fe-C system. In this model the elastic interaction between carbon atoms was taking into account. Our simulation results show that during growth the carbon-rich zones, after reaching the concentration around 11at% of carbon, undergo the inverse martensite transition from the bcc to the fcc phase. The employed atomistic approach makes possible the direct comparison of simulation results with experimental data obtained by Atom Probe Tomography.
||Planned: Supplemental Proceedings volume