Simulation of the Growth of Austenite from As-Quenched Martensite in Medium Mn Steels

作者：Fei Huyan, Jiayi Yan, Lars Olof Höglund, John Ågren, Annika Borgenstam · 发表于：Metallurgical and Materials Transactions A · 年份：2018 · DOI：10.1007/s11661-018-4497-3 · 被引用次数：43 · 研究领域：Microstructure and Mechanical Properties of Steels、Magnetic Properties and Applications、Hydrogen embrittlement and corrosion behaviors in metals

Abstract As part of an ongoing development of third-generation advanced high-strength steels with acceptable cost, austenite reversion treatment of medium Mn steels becomes attractive because it can give rise to a microstructure of fine mixture of ferrite and austenite, leading to both high strength and large elongation. The growth of austenite during intercritical annealing is crucial for the final properties, primarily because it determines the fraction, composition, and phase stability of austenite. In the present work, the growth of austenite from as-quenched lath martensite in medium Mn steels has been simulated using the DICTRA software package. Cementite is added into the simulations based on experimental observations. Two types of systems (cells) are used, representing, respectively, (1) austenite and cementite forming apart from each other, and (2) austenite forming on the cementite/martensite interface. An interfacial dissipation energy has also been added to take into account a finite interface mobility. The simulations using the first type of setup with an addition of interfacial dissipation energy are able to reproduce the observed austenite growth in medium Mn steels reasonably well.