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MM: Fachverband Metall- und Materialphysik

MM 37: Topical Session High Temperature Materials IV

MM 37.4: Vortrag

Donnerstag, 26. März 2009, 11:15–11:30, IFW A

Estimation of creep rates from short term tensile test relaxations — •Jonathan Paul, Uwe Lorenz, Michael Oehring, Roland Hoppe, and Fritz Appel — GKSS Research Centre, Geesthacht, Germany

In high temperature applications the creep behaviour of TiAl components can be an important issue. In this respect alloy composition and processing are important factors which need to be optimised so that a proper balance of mechanical properties can be obtained. To obtain a large creep property database requires many tests to be performed at different stress levels and temperatures which of course is both time consuming and expensive.

To overcome this requirement during alloy and processing development, a method of estimating the minimum creep rate at a single temperature but at a series of stress levels from a single short term tensile test including repeated stress relaxations has been developed which is presented in this paper. The experimentally measured minimum creep rates are in reasonable agreement with those predicted from stress relaxation.