Formation of Outburst Structure in Hot Dip Galvannealed Coatings on IF Steels

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 du...

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Bibliographic Details
Published inMetalurgija Vol. 46; no. 1; pp. 9 - 14
Main Authors Kollárová, M., Džupon, M., Leško, A., Parilák, Ľ.
Format Journal Article
LanguageEnglish
Published Croatian Metallurgical Society 01.01.2007
Subjects
Fe-Zn intermetallic compounds
galvanizing
galvannealing
outburst structure
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Summary: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.
ISSN:0543-5846
1334-2576