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Two joints have been developed using the solid-state diffusion bonding technique under Hot Isostatic Pressing. A fine grain high strength material is bonded onto a coarse grain creep resistant material. These joints are predicted to be used in gas turbine components. The bonds have been investigated in terms of micro-structural examinations and mechanical properties. The first results indicate a very good strength of the joints associated with a quite large ductility. Non-destructive evaluation techniques have been investigated to detect potential flaws at the interface.

Efficiency enhancement of gas turbine can be achieved by increasing the firing temperature or the engine size. Both solutions require materials with higher strength and creep resistance. This cannot be achieved with monolithic materials. One solution consists in developing bi-material components using solid state diffusion bonding between a high strength fine grain material and a high creep resistant coarse grain material. The objective of this paper is to manufacture such bonds and to determine their mechanical properties in comparison with the parent materials properties. Two joints have been investigated: Udimet 720 (U720) fine grain onto U720 coarse grain and U720 fine grain onto MC2 single crystal.

Additional information

Authors: BURLET H, CEA/CEREM, Grenoble (FR);LUTHI G, EMPA, Deubendorf (CH);GALLET S, ALSTOM PowerUkLtd, Lincoln (UK);OLSCHEWSKI J, BAM, Berlin (DE);PETEVES S, EC-JRC-Institute for Advanced Materials, Petten (NL);RAISSON G, Tecphy, Imphy (FR);VOGEL F, Turbomeca, Bordes (FR)
Bibliographic Reference: An oral report given at: The PARSONS 2000 Conference. Organised by: The Institute of Metals. Held at: Cambridge University, (UK), 3-7 July, 2000
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