Abstract
Formability of galvannealed sheets (GA) is an important feature in the automobile market. Various studies have been conducted on the formability of galvannealed steel sheets and it is known that the powdering property of the galvannealed coating is extremely sensitive to its gamma phase present in the coating and variations in Fe content in the coatings. The present work has been carried out to determine the powdering behaviour of GA product and to obtain correlations between the coating microstructure with powdering behaviour. Powdering of IF–HS–GA is more sensitive than IF–GA in terms of line speed conditions. Iron content (above 10%) of the coating has influence on the powdering behaviour of the steel. This paper also shows correlations between powdering and process parameters.
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