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Étude de la rugosité de surface induite par la déformation plastique de tôles minces en alliage d'aluminium AA6016

Abstract : As part of a project on aluminium alloys for vehicle weight reduction, the origins of roping in AA6016 aluminium sheets have been studied. This strain-induced phenomenon is related to surface roughness but involves narrow alignments along rolling direction (RD). Its lowers the surface quality, and its intensity is visually evaluated by vehicle manufacturers.An original quantification method is proposed. The morphological characterization of roughness features has been measured by using frequency functions such as the areal power spectral density. The overall roping quality mark, determined from quantifications of both the isotropic and unidirectional components, shows good agreement with the visual assessment, especially for the intermediate roping levels which exhibit several different surface appearances.The material microtexture has been experimentally measured through grain to grain layers by using serial sectioning and EBSD scans. The first 4 to 5 layers under the surface (-120μm) seem to play a leading role in the micromechanics of roping developpment since they simultaneously exhibit a high average grain size, significant segregation of crystallographic orientations, and a close similitude between surface roughness and microstructural feature wavelenghts.Numerical simulations verified that the identified texture pairs (Cube/Goss, Cube/Random and Cube/CT18DN) have sufficient out-of-plane strain difference to promote one element thick layer undulations. But, the mechanical influence of this layer decreases gradually with depth, and becomes negligible below 4 other layers.
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https://theses.hal.science/tel-00716025
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Submitted on : Monday, July 9, 2012 - 4:32:55 PM
Last modification on : Wednesday, June 24, 2020 - 4:18:36 PM
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Alban Guillotin. Étude de la rugosité de surface induite par la déformation plastique de tôles minces en alliage d'aluminium AA6016. Autre. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2010. Français. ⟨NNT : 2010EMSE0573⟩. ⟨tel-00716025⟩

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