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  • Investigations of damaging mechanisms of coil-coated steel sheet during forming in order to enhance the performance predictability of finished parts

Abstract

The report presents results on the formability and the cutting process of polymer-coated galvanised steel. Finite elements modelling (FEM) analysis of the process of forming and cutting are directly linked to the investigation of resulting defects such as structure of cut-edges. A two-layer coil coating system in combination with different metal pre-treatments and thin tailored plasma polymer layers were chosen as model systems.
The investigation of the defects has been carried out at different levels, from macroscopic, over microscopic to nanoscopic aspects. Observed defects were correlated with the corrosion resistance and the electrochemical behaviour of the coatings. Based on these results, defect formation and a reduced corrosion resistance of coil-coated material can be foreseen more easily on a profound knowledge basis.
Applied microscopic techniques were scanning electron microscopy, Raman microscopy, and atomic force microscopy. Electrochemical investigations were based on local electrochemical impedance spectroscopy and the scanning Kelvin probe.
Moreover, the nanoscopic investigations allow the design of new interfacial layer systems based on plasma polymer films for highly corrosion-resistant coil-coated steel sheet and have opened the fields of a better understanding of the forming behaviour of zinc coatings, which has not been addressed to date.

Additional information

Authors: GRUNDMEIER G, Max-Planck-Institut fur Eisenforschung (MPIE), Dusseldorf (DE);ROHWERDER M, Max-Planck-Institut fur Eisenforschung (MPIE), Dusseldorf (DE);BAUMERT B, Max-Planck-Institut fur Eisenforschung (MPIE), Dusseldorf (DE);PIEHL C, Thyssen Krupp Stahl AG, Duisburg (DE);ENGEL L, Thyssen Krupp Stahl AG, Duisburg (DE);KESSLER L, Thyssen Krupp Stahl AG, Duisburg (DE);STELLNBERGER K H, Voestalpine Stahl Linz GmbH, Linz (AT);TILL E, Voestalpine Stahl Linz GmbH, Linz (AT);KIRCHEBNER A, Voestalpine Stahl Linz GmbH, Linz (AT);SIMOES A, Instituto Superior Tecnico (IST) Lisboa (PT);BASTOS A, Instituto Superior Tecnico (IST) Lisboa (PT)
Bibliographic Reference: EUR 21135 EN (2004), 174 pp. Euro: 25
Availability: EUR-OP reference: KI-NA-21135-EN-S Available from EUR-OP sales agents URL: http://publications.eu/general/en/publications_en.htm
ISBN: ISBN: 92-894-8066-1
Record Number: 200417707 / Last updated on: 2004-09-30
Category: PUBLICATION
Original language: en
Available languages: en