Phase Transformations in the Al-Si Coating during the Austenitization Step

Raisa Grigorieva; Pascal Drillet; Jean Michel Mataigne; Abdelkrim Redjaïmia

doi:10.4028/www.scientific.net/SSP.172-174.784

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HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Phase Transformations in the Al-Si Coating during...

Phase Transformations in the Al-Si Coating during the Austenitization Step

Abstract:

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°C) before the transfer into the hot-stamping press.

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Periodical:

Solid State Phenomena (Volumes 172-174)

Pages:

784-790

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.784

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Online since:

June 2011

Authors:

Raisa Grigorieva, Pascal Drillet, Jean Michel Mataigne, Abdelkrim Redjaïmia

Keywords:

Al-Si Coating, Phase Transformation, Reaction Path

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