Cui abstract 2007

Non-destructive metal analysis of minting dies from Northern Germany (17th and 18th centuries). Contributions of chemistry and engineering to the history of techniques: Jianfeng Cui, Gottfried Wilhelm Leibnitz Universitat, Hannover

Cold rolled primary material is used for hot-galvanising. The material is annealed, hot-galvanised and then temper rolled in a continuous annealing line. The microstructure is applied into the sheet metal surface by rough temper rollers. As a negative effect, the temper rolling process causes a slight damage of the metal layer of fine rolled sheets as well as strain hardening of the material. Due to strain hardening the formability decreases. The goal of this proposal is to reduce the above mentioned disadvantages of mechanical temper rolling by applying nondestructive chemical investigation into the sheet metal surface.

The thickness (5 – 150 μm) and information on layer composition of untreated hot-galvanised layers have to be determined with the non-destructive method of μXRF via the x-ray signals of the elements contained in the layer and in the steel. Therefore the examined materials will be μXRF investigated after mechanical treatment in order to explain layer changes (such as changed in structure and thickness). Changes in the galvanised layers will be investigated by scanning electron microscopy. Several other analytical methods and testing procedures for the characterization of the induced changes will be applied as well.

The work will be carried out in cooperation with partners from the department of mechanical engineering.

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