Regensburg 2007 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 39: Mechanical properties I

MM 39.2: Vortrag

Donnerstag, 29. März 2007, 16:30–16:45, H6

Evaluating creep behaviour of thin wall structures at high temperatures - method and first results — •Rainer Hüttner, Rainer Völkl, and Uwe Glatzel — Rainer Hüttner, Metals and Alloys, University of Bayreuth, Ludwig-Thoma-Straße 36b, D-95447 Bayreuth, Germany

The knowledge of creep behaviour of structural materials for high temperature applications is prerequisite for life-time predictions. In order to optimize both the cooling efficiency and the weight of fast rotating turbine blades a general trend to reduce the wall thicknesses of the hollow investment castings is observed. This work deals with a method for evaluating creep behaviour of thin wall structures. The test equipment uses resistive heating to achieve fast heating and cooling rates. The environment during testing can be changed to vacuum, inert gas or air in order to determine in-situ oxidation effects on creep behaviour. Creep strain is measured with accuracy better than 0.1% by a non-contacting image vision technique. A video extensometer and the software SuperCreep is used to reach this high resolution. The principles of this technique and first results will be presented.