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Characterisation of galvanneal coatings on strip steel
journal contribution
posted on 2004-01-01, 00:00 authored by John LongJohn Long, David Haynes, Peter HodgsonPeter HodgsonGalvanneal is a form of zinc-coated sheet steel, where steel is dipped in molten zinc, and then heat treated in a furnace to produce a complex iron-zinc coating. Many industries, such as automotive, use galvanneal for components fabricated from sheet steel. The microstructural properties of galvanneal have a significant influence on how well the sheet metal changes shape on stamping. By means of optical microscopy, scanning electron microscopy, and glow-discharge optical emission spectrometry, we present a study of the microstructure of several galvanneal samples, both stamped and unformed, relating the phases and morphology of the coatings to performance in stamping operations. Samples of galvanneal were subjected to different heat-treatment temperatures. The frequency of defects in stamped components was found to be related to the average alloy content in the coatings, which varied with furnace temperature. An increased average iron content in the coatings was related to increased powdering defects in stamping operations that use galvanneal coated sheet steel.
History
Journal
Materials forumVolume
27Pagination
62 - 67Publisher
IMEALocation
North Melbourne, VicISSN
1447-6738Language
engNotes
Reproduced with the specific permission of the copyright owner.Publication classification
C1 Refereed article in a scholarly journalCopyright notice
Institute of Materials Engineering Australasia LtdUsage metrics
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