Print Email Facebook Twitter Prediction and Validation of the Austenite Phase Fraction upon Intercritical Annealing of Medium Mn Steels Title Prediction and Validation of the Austenite Phase Fraction upon Intercritical Annealing of Medium Mn Steels Author Farahani, H. Xu, W. Van der Zwaag, S. Faculty Aerospace Engineering Department Aerospace Structures & Materials Date 2015-08-11 Abstract In this research, the effects of Mn and Si concentration and that of the isothermal intercritical holding temperature on the austenite-to-ferrite (? ? ?) and the martensite-to-austenite (?? ? ?) phase transformations are studied for a series of Fe-C-Mn-Si steels with up to 7 wt pct Mn. The model is based on the local equilibrium (LE) concept. The model predictions are compared to experimental observations. It is found that the austenite volume fraction at the end of intercritical annealing depends significantly on the initial microstructure. For Mn concentrations between 3 and 7 wt pct, the LE model is qualitatively correct. However, at higher Mn levels the discrepancy between the predicted austenite fractions and the experimental values increases, in particular for the ?? ? ? transformation. Intragrain nucleation is held responsible for the higher austenite fractions observed experimentally. Silicon is found have a much smaller effect on the kinetics of the intercritical annealing than Mn. To reference this document use: http://resolver.tudelft.nl/uuid:c086bff0-389a-4d42-a35c-65c807681281 Publisher Springer ISSN 1073-5623 Source https://doi.org/10.1007/s11661-015-3081-3 Source Metallurgical and Materials Transactions A, 2015 Part of collection Institutional Repository Document type journal article Rights © 2015 The Author(s)This article is published with open access at Springerlink.com Files PDF Xu_2015.pdf 2.14 MB Close viewer /islandora/object/uuid:c086bff0-389a-4d42-a35c-65c807681281/datastream/OBJ/view