MATEC Web of Conferences
Volume 33, 2015ESOMAT 2015 – 10th European Symposium on Martensitic Transformations
|Number of page(s)||6|
|Section||Martensite in steel|
|Published online||07 December 2015|
Austenite reconstruction via EBSD measurements: a tool to understand low Carbon martensite steel properties
1 ArcelorMittal Global R&D Ghent, J.F. Kennedylaan, 9060 Zelzate, Belgium
2 University Grenoble Alpes, 38000 Grenoble, France
3 CEA, LETI, MINATEC Campus, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
a Corresponding author: firstname.lastname@example.org
The basic characterization of the austenite grain size and shape prior to quenching to martensite was already used in the past to optimize the mechanical properties and impact toughness of low Carbon martensitic steel. This basic characterization can typically be done by optical microscopy. To better understand the mechanisms that generate the different properties, however, a more detailed analysis is required. An algorithm has been developed to calculate the austenite orientation starting from the martensite orientation measured by EBSD. The method has been applied to explain the different properties of martensite after austenitization and quenching and of direct quenched martensite with different levels of accumulated strain. It is shown that a small austenite size is needed to improve the impact toughness, regardless of the process route. The strength is strongly depending on the dislocation density in the austenite.
© Owned by the authors, published by EDP Sciences, 2015
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