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3085 |
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Tuesday, March 27, 2012, SuperC, Hall Ford 4:10 PM Surface Treatment |
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Surface engineering of aluminium alloys using the options of innovative electron beam deflection techniques |
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Marco Klemm* / Stahlzentrum Freiberg e.V., Germany Rolf Zenker / TU Bergakademie Freiberg - Institute of Materials Engineering, Germany Ingrid Haase/ SWM - Structure and Materials Mechanics Research gGmbH, Germany Rainer Franke/ IMA - Materials Research and Applications Engineering GmbH, Germany Andrea Rose/ IWT - Foundation Institute of Materials Science, Germany Axel von Hehl/ IWT - Foundation Institute of Materials Science, Germany |
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Aluminium alloys are the commonly used lightweight construction materials in most industrial applications. With regard to extensive loading conditions like in systems with high demands on friction and wear behaviour, also at higher working temperatures (e.g. engine components), the alloying concepts on their own often do not lead to the desired aims. It requires additional activities to protect functional surfaces, especially against wear and/or corrosion. Because of a modern generation of beam deflection techniques available, electron beam (EB) liquid phase surface treatment is an innovative solution for these requirements. This will be demonstrated by the application of multiprocess technologies. The modification of microstructure and properties of the surface layers is caused by rapid solidification and cooling by self-quenching. Local properties (hardness, friction coefficient, wear rate) can be influenced positively, especially using implemented additional elements (e.g. Co, Cu, Fe and Ni) and/or hard particles (WC, Cr3C2) during local EB processing. The paper deals with current investigation results of EB surface remelting, alloying and dispersing of different Al alloys, using high frequency beam deflection techniques. Especially the options of EB multispot and multiprocess techniques will be discussed according to the interaction to the material and its influence on the surface layer quality as well as the local microstructure and the characteristic layer properties (e.g. hardness, friction/wear and corrosion behaviour). |