Influence of interface mobility on the evolution of austenite-martensite grain assemblies during annealing

Journal article (2009)

Authors

Maria Jesus Santofimia OLD Metals Processing, Microstructures and Properties , Material Innovation Institute (M2i)
JG Speer Colorado School of Mines
AJ Clarke Los Alamos National Laboratory
L. Zhao OLD Metals Processing, Microstructures and Properties , Material Innovation Institute (M2i)
J. Sietsma OLD Metals Processing, Microstructures and Properties
Research Group
OLD Metals Processing, Microstructures and Properties
Copyright: © 2009 Maria Jesus Santofimia, JG Speer, AJ Clarke, L. Zhao, J. Sietsma
DOI
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https://doi.org/10.1016/j.actamat.2009.06.024
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Published Date

2009

Language

English

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Research Group

OLD Metals Processing, Microstructures and Properties

Abstract

The quenching and partitioning (Q&P) process is a new heat treatment for the creation of advanced high-strength steels. This treatment consists of an initial partial or full austenitization, followed by a quench to form a controlled amount of martensite and an annealing step to partition carbon atoms from the martensite to the austenite. In this work, the microstructural evolution during annealing of martensite–austenite grain assemblies has been analyzed by means of a modeling approach that considers the influence of martensite–austenite interface migration on the kinetics of carbon partitioning. Carbide precipitation is precluded in the model, and three different assumptions about interface mobility are considered, ranging from a completely immobile interface to the relatively high mobility of an incoherent ferrite–austenite interface. Simulations indicate that different interface mobilities lead to profound differences in the evolution of microstructure that is predicted during annealing.