Original title: Fractural based microstructural damane evaluation in Ni-based superalloy gas turbine blades
Authors: Tarafder, M. ; Dlouhý, Ivo ; Hore, S. ; Das, S. K.
Document type: Papers
Conference/Event: New Methods of Damage and Failure Analysis of Structural Parts, Ostrava (CZ), 2010-09-06 / 2010-09-10
Year: 2010
Language: eng
Abstract: A fractal based evaluation of microstructural damage in Ni based superalloy cast IN 738 LC used in gas turbine blades is presented in the paper. Non-destructive in-situ replica method was used without damaging the blades for the evaluation of microstructure. The theoretical life of the stator blades of the gas turbine, which was exposed to temperature varying between 1060°C to 1100°C, was approximately 100,000 hours. In order to assess the suitability of the stator blades after 50% of the service life, fractal based microstructural damage evaluation has been conducted. The fractal dimensions of the in situ metallographic images can be correlated to the progressive deterioration of hardness at various locations of the blades. The extent of damage is inversely proportional to the fractal dimension. For fractal dimension below 2.4, the material can be classified as substantially damaged.
Keywords: fractal dimension; gas turbine; hardness; microstructure; Ni-base superalloy
Project no.: CEZ:AV0Z20410507 (CEP)
Host item entry: New Methods of Damage and Failure Analysis of Structural Parts, ISBN 978-80-248-2265-5

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0196376

Permalink: http://www.nusl.cz/ntk/nusl-42720


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Research > Institutes ASCR > Institute of Physics of Materials
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