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Metal Temperature Map Determination of a Serviced Gas Turbine Bucket and Comparison With FEM Temperature Distribution

[+] Author Affiliations
Francesco Mastromatteo, Fabrizio Mammoliti, Daniele Ficorilli

University of Perugia, Perugia, Italy

Massimo Giannozzi, Marco Romanelli

GE Oil&Gas – Nuovo Pignone, Florence, Italy

Paper No. GT2006-90136, pp. 913-918; 6 pages
doi:10.1115/GT2006-90136
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 4: Cycle Innovations; Electric Power; Industrial and Cogeneration; Manufacturing Materials and Metallurgy
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4239-8
  • Copyright © 2006 by ASME

abstract

Nickel-based superalloys are widely used in manufacturing of several important components of aeronautics and land based gas turbines. The good high temperature resistance of these materials is due to their particular microstructure consisting of a FCC lattice nickel matrix, called γ, strengthened by precipitation of a coherent second phase Ni3 (Ti,Al) known as γ′. During service at very high temperatures, γ′ precipitates tend to lose their initial configuration and change their size, shape and distribution, so decreasing material properties, in particular creep resistance. In this work the evolution of microstructure in a serviced first stage bucket from a GE machine has been examined. Several cross sections taken at different heights along the airfoil have been observed by SEM, obtaining a detailed map of the microstructure in the component. A quantitative evaluation of service temperature in the different areas has then been achieved by γ′ precipitates size determination by means of image analysis, combined with a γ′ coarsening model optimized for the particular alloy in use. Temperature values so obtained have been compared with those resulting from the finite element method (FEM) temperature distribution performed during design stage.

Copyright © 2006 by ASME

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