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Titre: Phase transformations in the Al-Si coating during the austenitization step
Auteur(s): Raisa Grigorieva, Pascal Drillett, J. -M. Mataigne et A. Redjaïmia
Journal: Solid State Phenomena
Direction: Y Brechet, E Clouet, A Deschamps, A Finel et F Soisson
Année: 2011
Volume: 172-174
Issue: Part 1
Collection: Solid State Phenomena
Pages: 784-790
Organisation: Mat & Process Sci & Engn Lab; CEA, Tranverse Programme Adv Mat; French Aerospace Lab; Inst Chem, Natl Ctr Sci Res; French Phase Field Network; Lab Etude Microstructures
DOI: 10.4028/
ISSN: 1012-0394
Résumé: Nowadays more and more hot stamped steel sheets dedicated for the automotive body-in-white structure are pre-coated to prevent the steel surface against iron oxidation and decarburization during the austenitization step. For these applications, the coating is deposited by continuous hot-dipping the steel in an Al-Si bath. The Al-Si coating, at the delivery state, contains Al-grains, Al-Fe-Si ternary phases, Al-Fe binary phases. During the austenitization, the Al-Si coating transforms completely by inter-diffusion and solidification reactions. The mechanisms of Al-Fe-Si phase transformations at high temperature are almost unknown. The phase transformations occurring during austenitization define the final coating microstructure responsible for the in use properties of the product like spot welding, painting adherence or corrosion behavior. It is the aim of this paper to propose a new way of understanding the mechanisms of phase transformation in the Al-Si coating during the austenitization step (between 900 and 930 degrees C) before the transfer into the hot-stamping press.
Projet: Département SI2M : Microstructures et Contraintes

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