Prediction and Validation of the Austenite Phase Fraction upon Intercritical Annealing of Medium Mn Steels

Journal article (2015)
Department
Aerospace Structures & Materials (Aerospace Engineering) (TU Delft)
Copyright: This article is published with open access at Springerlink.com
More Info
expand_more

Published Date

11-08-2015

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Source:

Metallurgical and Materials Transactions A, 2015

Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

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.

Files

Xu_2015.pdf
(pdf | 2.14 Mb)