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Environmental Degradation of Gas Turbine Materials in Steam PUBLIC ACCESS

[+] Author Affiliations
Y. Patel, D. Tamboli, V. H. Desai

University of Central Florida, Orlando, FL

N. S. Cheruvu

Southwest Research Institute, San Antonio, TX

Paper No. 97-GT-293, pp. V004T12A006; 15 pages
doi:10.1115/97-GT-293
From:
  • 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

abstract

Steam has been proposed as an efficient cooling medium for the hot section components in the advanced gas turbines replacing compressed air for more efficient cooling allowing the turbine to operate at higher efficiency. To evaluate the effect of steam on oxidation and corrosion of hot section materials, three superalloys (X-45, Inconel-617 and IN-738LC) were exposed to steam at 840°C. Steam environments used were (a) steam generated from deionized water, (b) steam generated from deionized water with 5ppm each of NaCl and Na2SO4 and (c) steam generated from deionized water with 50 ppm each of NaCl and Na2SO4. The respective exposure times were 3900, 2950, and 1450 hours. IN-738LC showed severe internal oxidation in steam. In contaminated steam the hot corrosion damage was maximum in Inconel-617. X-45 showed less oxidation damage than IN-738LC and less hot corrosion than Inconel-617.

Copyright © 1997 by ASME
Topics: Gas turbines , Steam
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