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Surface Optimisation by Engineering the Stress and Roughness FREE

[+] Author Affiliations
Peter O’Hara

Metal Improvement Co. Inc.

Paper No. 96-GT-451, pp. V005T12A009; 6 pages
doi:10.1115/96-GT-451
From:
  • ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General
  • Birmingham, UK, June 10–13, 1996
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7876-7
  • Copyright © 1996 by ASME

abstract

Performance of turbine components can significantly be affected by surface/subsurface characteristics. Techniques applied today and being developed further entail introducing into a components surface a residual compressive stress of predictable magnitude and depth followed by superfinishing to improve the surface finish.

The effect will be to lower the mean stress which will increase component life and fatigue strength or enable higher loads through present designs; develop a damage tolerant layer capable of withstanding corrosion pitting or strike damage while in service and produce a final roughness capable of improving flow characteristics on turbine blades/buckets.

The processes to achieve the above include Controlled Shot Peening and Superfinishing. In combination, an optimised surface condition will result.

Copyright © 1996 by ASME
This article is only available in the PDF format.

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