Precipitation and Grain Growth Modelling in Ti-Nb Microalloyed Steels

21 Pages Posted: 31 Oct 2018

See all articles by Alexis Graux

Alexis Graux

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

Sophie Cazottes

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

David De Castro

National Center for Metallurgical Research (CENIM-CSIC) - Materalia Research Group

David San Martin

National Center for Metallurgical Research (CENIM-CSIC) - Materalia Research Group

Carlos Capdevila

National Center for Metallurgical Research (CENIM-CSIC) - Materalia Research Group

Jose Maria Cabrera

Polytechnic University of Catalonia (UPC) - Barcelona East School of Engineering (EEBE)

Sílvia Molas

Fundació CTM Centre Tecnològic

Sebastian Schreiber

Thyssenkrupp Steel Europe AG

Djordje Mirkovíc

Salzgitter Mannesmann Forschung GmbH

Frédéric Danoix

Thyssenkrupp Steel Europe AG

Matthieu Bugnet

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

Damien Fabrègue

Université de Lyon - MATEIS CNRS UMR 5510

Michel Perez

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

Date Written: October 30, 2018

Abstract

Mechanical properties of microalloyed steels are enhanced by fine precipitates, that ensure grain growth control during subsequent heat treatment. This study aims at predicting austenite grain growth kinetics coupling a precipitation model and a grain growth model. These models were applied to a titanium and niobium microalloyed steel. The precipitate size distributions were first characterized by TEM and SEM and prior austenite grain boundaries were revealed by thermal etching after various isothermal treatments. From CALPHAD database, a solubility product was determined for (Ti,Nb)C precipitates. A numerical model based on the classical nucleation and growth theories was used to predict the time evolution of (Ti,Nb)C size distributions during various isothermal heat treatments. The precipitation model was validated from TEM/SEM analysis. The resulting precipitate size distributions served as entry parameters to a simple grain growth model based on Zener pinning. The pinning pressure was calculated using the whole size distribution. The resulting austenite grain growth kinetics were in good agreement with the experimental data obtained for all investigated heat treatments.

Keywords: Microalloyed steels, Precipitation, Austenite, Grain growth, Modelling

Suggested Citation

Graux, Alexis and Cazottes, Sophie and Castro, David De and Martin, David San and Capdevila, Carlos and Cabrera, Jose Maria and Molas, Sílvia and Schreiber, Sebastian and Mirkovíc, Djordje and Danoix, Frédéric and Bugnet, Matthieu and Fabrègue, Damien and Perez, Michel, Precipitation and Grain Growth Modelling in Ti-Nb Microalloyed Steels (October 30, 2018). Available at SSRN: https://ssrn.com/abstract=3275448 or http://dx.doi.org/10.2139/ssrn.3275448

Alexis Graux (Contact Author)

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510 ( email )

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

Sophie Cazottes

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

David De Castro

National Center for Metallurgical Research (CENIM-CSIC) - Materalia Research Group

Avda Gregorio del Amo 8
Madrid E-28040
Spain

David San Martin

National Center for Metallurgical Research (CENIM-CSIC) - Materalia Research Group

Avda Gregorio del Amo 8
Madrid E-28040
Spain

Carlos Capdevila

National Center for Metallurgical Research (CENIM-CSIC) - Materalia Research Group

Avda Gregorio del Amo 8
Madrid E-28040
Spain

Jose Maria Cabrera

Polytechnic University of Catalonia (UPC) - Barcelona East School of Engineering (EEBE)

C. Jordi Girona, 31
Barcelona, 08034
Spain

Sílvia Molas

Fundació CTM Centre Tecnològic

Avda Bases de Manresa
1
08242 Manresa
Spain

Sebastian Schreiber

Thyssenkrupp Steel Europe AG

Kaiser-Wilhelm-Strae 100
47166 Duisburg
Germany

Djordje Mirkovíc

Salzgitter Mannesmann Forschung GmbH

Eisenhttenstrasse 99
Salzgitter, 38239
Germany

Frédéric Danoix

Thyssenkrupp Steel Europe AG

Kaiser-Wilhelm-Strae 100
47166 Duisburg
Germany

Matthieu Bugnet

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

Damien Fabrègue

Université de Lyon - MATEIS CNRS UMR 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

Michel Perez

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

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