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3153 |
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Tuesday, March 27, 2012, SuperC, Hall Ford 5:00 PM Surface Treatment |
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Generating and assessing the quality and functionality of EB structured surfaces for dissimilar material joints |
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Anita Buxton* / TWI Ltd, Cambridge R. Oluleke / Materials Science Centre, University of Manchester, UK P. Prangnell/ Materials Science Centre, University of Manchester, UK |
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One approach for generating strong, tough joints between dissimilar materials is the use of interlocking features. A newly developed electron beam (EB) surface engineering technology (Surfi-Sculpt®) has the flexibility to successfully manufacture such surfaces. An electron beam is deflected rapidly over a surface to displace material in a controlled manner which results in the rapid generation of complex surface features that cannot be produced conventionally; their size, shape and distribution can be varied to produce a metal surface tailored for bonding to composite material. For improved heat transfer in heat exchanger applications the topography of the surface features is important and their mechanical properties are not. In advanced joining applications such as orthopaedic implants to bone, or the joining of composites to metal in the aerospace industry, the strength and integrity of the features is critical. Current work is assessing the effects of processing parameters on the surface microstructure, chemical homogeneity, flaw density and residual stresses, and offers the opportunity to optimise the properties of surface features for a given service requirement. This paper describes the Surfi-Sculpt® process, surfaces resulting and their characteristics, to demonstrate ways in which high integrity optimised surface structures for dissimilar materials joining may be achieved. |