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Influence of texture on the electro‐galvanized Zn coating formability in the absence of die contact
Author(s) -
De Cooman Bruno C.,
De Wit Katrien,
Wichern Christian M.
Publication year - 2002
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.200200019
Subject(s) - formability , galvanization , materials science , coating , deformation (meteorology) , texture (cosmology) , die (integrated circuit) , metallurgy , galvannealed , cracking , composite material , deep drawing , layer (electronics) , image (mathematics) , artificial intelligence , computer science , nanotechnology
The present contribution reviews results of research on the effect of the texture on the formation of cracks in electro‐galvanised Zn coatings on sheet steel. The Zn coating behaviour was studied during deformation in the absence of die contact in order to avoid frictional effects. In addition, the complex micro‐mechanical phenomena that occur during the deformation of zinc coated sheet steel In actual real life manufacturing operations were simplified by subjecting the coatings to well‐defined deformation modes only. The crystallographic texture of the Zn coating and the deformation mode were found to have a clear influence on the formation of cracks. The resistance to cracking in all deformation modes was most pronounced in Zn coatings with a majority of the Zn micro‐crystals oriented in the high index pyramidal orientation, i.e. with {10.3} parallel to the sheet surface. The presence of some Zn micro‐crystals in the basal orientation, i.e. with {00.1} parallel to the sheet surface, is beneficial to avoid the cracking of the coating. The presence of prismatic oriented Zn crystals, with {10.0} parallel to the sheet surface, leads to the formation of cracks in all deformation modes. The high resistance to cracking of the in‐sheet {10.3} coating texture is due to the ease of the rotation of the basal planes into an in‐sheet orientation during the deformation.