Fractural based microstructural damane evaluation in Ni-based superalloy gas turbine blades

0358287 - ÚFM 2011 RIV CZ eng K - Conference Paper (Czech conference)
Tarafder, M. - Dlouhý, Ivo - Hore, S. - Das, S. K.
Fractural based microstructural damane evaluation in Ni-based superalloy gas turbine blades.
New Methods of Damage and Failure Analysis of Structural Parts. Ostrava: VŠB - TU Ostrava, 2010 - (Strnadel, B.), s. 253-261. ISBN 978-80-248-2265-5.
[New Methods of Damage and Failure Analysis of Structural Parts. Ostrava (CZ), 06.09.2010-10.09.2010]
Institutional research plan: CEZ:AV0Z20410507
Keywords : Ni-base superalloy * gas turbine * microstructure * hardness * fractal dimension
Subject RIV: JL - Materials Fatigue, Friction Mechanics

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.
Permanent Link: http://hdl.handle.net/11104/0196376