Relationship Between γ′ Phase Degradation and In-Service GTD-111 First-Stage Blade Local Temperature
- Centro de Ingeniería y Desarrollo Industrial (CIDESI), Dirección de Ingeniería de Superficies (Mexico)
The Ni-based superalloy GTD-111 is used in manufacturing of first-stage blades for industrial gas turbines due to its high stability and strength at high temperatures. The remarkable properties of this alloy are related to its suitable microstructure obtained by the precipitation hardening mechanism. The microstructure of superalloys nevertheless degrades when they are exposed to long-term service. In this paper, the microstructure of a service-exposed GTD-111 blade was evaluated at different positions along the airfoil. Pores, carbides, eta and γ′ phases were analyzed. As a result of this study, it was found that only the γ′ phase exhibited significant differences in size and shape. The coalescence and coarsening of the γ′ phase near to the trailing edge tip were evident, which may be related to the typical failure of the blade in this region. Based on the Ostwald ripening theory, coarsening of this phase was used to calculate the in-service temperatures in the airfoil. In five locations of the trailing edge, temperature was found to vary from 679 to 961 °C.
- OSTI ID:
- 22970842
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 4 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
Similar Records
Turbine blade squealer tip rail with fence members
Analysis of particle growth by coalescence during liquid phase sintering