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Microcracks in superalloys: From local in-situ measurements to lifetime prediction: Dedicated to Professor Eckard Macherauch on the occasion of the 80th anniversary of his birth by Michael Marx; Horst Vehoff is a Engineering article available to read on EtoBox.

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## Abstract The established__K__-concept with the Paris law as the central equation often used for life-time prediction and dimensioning does not fit with the micromechanical crack tip opening displacement (CTOD) concept. While the__K__-concept is based on continuum mechanics, the CTOD is influenced by the local microstructure. Consequently, the CTOD-concept is checked in situ in the scanning electron microscope and is found to be the appropriate micromechanical description of the crack propagation mechanism. However, it is shown that during low cycle fatigue of turbine materials, even under extreme conditions short cracks behave less harmfully than expected. Additionally a new technique of artificial crack initiation by operating with a focused ion beam is used to investigate special crack problems such as the interaction of cracks with microstructural barriers in detail, which was not previously possible in this systematic way.

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Author

Michael Marx; Horst Vehoff

Publisher

Walter de Gruyter GmbH

Published

2006

Language

EN

Field

Engineering (Physical Sciences)