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01-04-2014 | Communication | Issue 4/2014

Metallurgical and Materials Transactions A 4/2014

Predicting the Austenite Fraction After Intercritical Annealing in Lean Steels as a Function of the Initial Microstructure

Journal:
Metallurgical and Materials Transactions A > Issue 4/2014
Authors:
Hao Chen, Xiaojun Xu, Wei Xu, Sybrand van der Zwaag
Important notes
Manuscript submitted October 24, 2013.

Abstract

The final fractions of austenite after the isothermal austenite-to-ferrite transformation and its reverse transformations (including the martensite-to-austenite and the pearlite + ferrite-to-austenite transformations) in the intercritical annealing region have been studied using full equilibrium (FE), paraequilibrium (PE), and local equilibrium (LE) calculations and experiments. The LE model predictions are in a very good agreement with the experimental results, while the FE and PE model predictions deviate significantly. It is also found that the LEP/LENP transition for the austenite-to-ferrite transformation deviates from those of its reverse transformations. The magnitude of deviation increases with the increasing Mn concentration.

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