The assessment of service induced degradation of nickel-base alloy Inconel 738LC of the gas turbine blade airfoil hot section, after 24000 hours of operation at high temperature is presented. The assessment include the blade coating degradation, changes of the gamma prime (γ′) phase (aging and coarsening), carbides and brittle phases precipitation, grain type and size characterization, and evaluation of interface coating/base alloy and cracks. The results of blade hot section (airfoil) microstructural assessment are compared to the cold reference zone (bucket root) to show the degradation degree of the alloy and its lifetime consumed. Finally, conclusions are presented indicating the alloy main microstructure elements which influence of blade behavior and the factors that can be used to determine the grade of material deterioration and lifetime consumed.
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ASME 2004 Power Conference
March 30–April 1, 2004
Baltimore, Maryland, USA
Conference Sponsors:
- Power Division
ISBN:
0-7918-4162-6
PROCEEDINGS PAPER
Metallurgical Assessment of Degradation of a Gas Turbine Bucket Made of Inconel 738LC Alloy After 24000 H in Service
Zdzislaw Mazur,
Zdzislaw Mazur
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Morelos, Me´xico
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Alberto Luna-Rami´rez,
Alberto Luna-Rami´rez
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Morelos, Me´xico
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Julio A. Jua´rez-Islas
Julio A. Jua´rez-Islas
Universidad Nacional Auto´noma de Me´xico, Me´xico, D. F., Me´xico
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Zdzislaw Mazur
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Morelos, Me´xico
Alberto Luna-Rami´rez
Instituto de Investigaciones Ele´ctricas, Cuernavaca, Morelos, Me´xico
Julio A. Jua´rez-Islas
Universidad Nacional Auto´noma de Me´xico, Me´xico, D. F., Me´xico
Paper No:
POWER2004-52127, pp. 325-331; 7 pages
Published Online:
November 17, 2008
Citation
Mazur, Z, Luna-Rami´rez, A, & Jua´rez-Islas, JA. "Metallurgical Assessment of Degradation of a Gas Turbine Bucket Made of Inconel 738LC Alloy After 24000 H in Service." Proceedings of the ASME 2004 Power Conference. ASME 2004 Power Conference. Baltimore, Maryland, USA. March 30–April 1, 2004. pp. 325-331. ASME. https://doi.org/10.1115/POWER2004-52127
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