Metallurgy, Vol. 46 No. 1, 2007.
Original scientific paper
Formation of Outburst Structure in Hot Dip Galvannealed Coatings on IF Steels
M. Kollárová
M. Džupon
A. Leško
Ľ. Parilák
Abstract
Outburst structure in two industrially produced hot dip galvanized interstitial free steel sheets for automotive industry after additional annealing has been examined. Ti IF steel was found to form weak outburst structure in the early stage of annealing, followed by frontal growth of Fe-Zn phases during further heating. The high reactivity of this steel was confirmed by rapid G-phase formation. Under the same conditions, Ti-Nb-P IF steel exhibited frontal growth of Fe-Zn compounds without G-phase formation due to relatively high phosphorous content, which is known as inhibitor of Fe-Zn reaction, but simultaneously significant occurrence of undesired outburst structures was recorded. It was assumed that the phosphorous content was insufficient and/or ferrite grain was very fine.
Keywords
galvanizing; galvannealing; Fe-Zn intermetallic compounds; outburst structure
Hrčak ID:
6448
URI
Publication date:
12.12.2006.
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