Relationship Between Residual Creep Life and Microstructure of γ′ Strengthened Ni-Base Alloy for Gas Turbine Combustor Parts FREE

[+] Author Affiliations
S. Imano, S. Nakamura

Hitachi Ltd., Hitachi, Japan

A. Kanaya, J. Kusumoto, H. Watanabe

Kyushu Electric Power CO., INC., Fukuoka, Japan

Paper No. 97-GT-349, pp. V004T12A008; 6 pages
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME


To estimate the residual life of heavy duty gas turbine hot section components, we studied the microstructure of aged, stress aged and creep ruptured γ′ strengthened alloy for combustor parts. The coarsening rate of precipitate was evaluated, and the activation energy for coarsening was found to be 327 kJ/mol which is slightly higher than the activation energy of volume diffusion for Al, Ti in a Ni solid solution. According to the experimental results, stress dependency of coarsening is not apparent, and the mean diameter of γ′ for creep ruptured specimens is not sensitive to temperature under the same stress conditions. This phenomenon can be explained with some assumptions. Using these results, methods for estimating metal temperature and creep damage based on microstructural information are performed for stress aged samples. These estimated results were compared with actual values.

Copyright © 1997 by ASME
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