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2005
Conference Paper
Titel
Remaining life evaluation of high temperature components by X-ray diffraction
Abstract
The paper describes partial results of 5th Framework Program of EC "Innovative residual service time assessment of industrial plant components using real structure analysis by on site X-ray diffraction XPECTION" which concentrated on the development of an advanced on-site inspection method and assessment system for evaluation of material properties degradation due to service conditions. Two (a ferritic-bainitic and an austenitic) steels used in the power generating plants were used for the experimental evaluation within the scope of the project. Original material properties were measured and compared with the artificially degraded material properties and the properties of both the steels degraded in service. The X-ray diffraction based material degradation monitoring device and evaluation procedure represents: The new technique that can be used in field, without material removal It is a non-destructive technique, which can be used without any damage of the component. Th e localities which cannot be analysed by replicas can be inspected with this technique. The X-ray diffraction has been demonstrated as very promising technique for feritic-bainitic steels. A method of X-ray parameter correlation with creep damage and mechanical properties is proposed. The Larson-Miller parameter is applied to close the correlation loop between the X-ray parameter and damage of the structure caused by long-term service exposition to high creep temperatures. A new damage theory was derived and verified on several accessible creep stress to rupture results making thus possible to perform simulation of processes of material degradation in service.
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