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Grain Boundary Cracking and Microstructural Changes Induced by the Grinding of IN738LC Turbine Blades FREE

[+] Author Affiliations
Thomas J. Fitzgerald, Thomas J. Carr

Westinghouse Electric Corporation, Orlando, FL

Paper No. 97-GT-168, pp. V004T12A005; 8 pages
doi:10.1115/97-GT-168
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

In this study, the microstructure of IN738LC turbine blades ground by two different vendors was examined. Turbine blades from a grinding vendor reporting the occasional appearance of “linear indications” were evaluated. The indications were found to be grain boundary cracks, some over 1 mm in depth, running perpendicular to the grinding direction. The cracked blades showed signs of surface melting which can be regarded as a prerequisite for grain boundary cracking in the grinding of IN738LC. Blades ground by a different vendor, not reporting grinding problems, were also examined and no surface melting was seen. No fundamental difference was seen in the as-cast microstructure between the blades from the two vendors. All the observations in this study thus indicate that the grinding cracks in the blades from the first vendor resulted from improper or uncontrolled grinding conditions.

Copyright © 1997 by ASME
This article is only available in the PDF format.

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