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Interaction between the coating characteristics of galvanneal steel and forming parameters during flat die drawing

Nanayakkara, N.K.B.M.P., Long, John and Hodgson, Peter 2005, Interaction between the coating characteristics of galvanneal steel and forming parameters during flat die drawing, Materials forum, vol. 29, pp. 340-344.

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Title Interaction between the coating characteristics of galvanneal steel and forming parameters during flat die drawing
Author(s) Nanayakkara, N.K.B.M.P.
Long, JohnORCID iD for Long, John orcid.org/0000-0001-6110-5904
Hodgson, Peter
Journal name Materials forum
Volume number 29
Start page 340
End page 344
Publisher IMEA
Place of publication North Melbourne, Vic
Publication date 2005
ISSN 1447-6738
Keyword(s) galvanneal steel
galvanneal coating thickness
Summary Galvanneal steel is considered to be better for automotive applications than its counterpart, galvanized steel, mainly because of its superior coating and surface properties. Galvanneal steel is produced by hot dipping sheet steel in a bath of molten zinc with small, controlled, levels of aluminium, followed by annealing which creates a Fe-Zn intermetallic layer. This intermetallic layer of the coating improves spot weldability and improves subsequent paint appearance. However, if the microstructure of the coating is not properly controlled and forming parameters are not properly selected, wear of the coating could occur during stamping. Frictional sliding of the sheet between the tool surfaces results in considerable amount of coating loss. An Interstitial Free steel with a Galvanneal coating of nominally 60g/m2 was used for the laboratory experiments. Flat Face Friction (FFF) tests were performed with different forming conditions and lubricants to simulate the frictional sliding in stamping. Glow-Discharge Optical Emission Spectrometry (DG-OES) was used to measure the change in the coating thickness during sliding. Optical microscopy was considered for imaging the surfaces as well as an optical method to compare the changes in the coating thickness during the forming. The change to the Galvanneal coating thickness was found to be a function of forming parameters.

Notes Reproduced with the specific permission of the copyright owner.
Language eng
Field of Research 090299 Automotive Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©Institute of Materials Engineering Australasia
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30002974

Document type: Journal Article
Collections: School of Engineering and Technology
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.