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Land Based Turbine Casting Initiative FREE

[+] Author Affiliations
Boyd A. Mueller, Allen R. Price, Kenneth S. Murphy

Howmet Corporation, Whitehall, MI

Gregory B. Bell

Howmet Corporation, Hampton Casting, Hampton, VA

Paper No. 97-GT-430, pp. V004T12A023; 11 pages
doi:10.1115/97-GT-430
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

Howmet is currently conducting a Department of Energy funded Advanced Turbine Systems program, the Land Based Turbine Casting Initiative, to scale single crystal casting technological advances developed for aircraft gas turbine engines up to land based gas turbine sized components. The program encompasses technical activities in the areas of: low sulfur alloys (low sulfur melt processing treatments), casting process development (casting process, mold, core and wax), post-cast process development (mold, core, and gating removal, heat treatment, HIP, and inspection), and casting defect tolerance level establishment (freckles, off-orientation, low angle boundaries, and recrystallized grains).

This presentation will highlight recent progress in the areas of low sulfur alloy, large single crystal casting process development, and 2.5D reconstruction X-ray inspection system development. Howmet has developed a melt treatment to reduce the sulfur content of the nickel-based superalloy ingot it manufactures. Sulfur contents achieved with this technique will be compared to sulfur levels present in currently available ingot. The effect of the reduced sulfur contents on oxidation performance is being investigated and will be reported. The casting process development activities are foundry experiments to determine the effect of different process factors on both grain and dimensional quality. The status of casting activities to scale aeroengine processes up to land based sized components will be presented. The 2.5D reconstruction uses X-ray metrology and multiple 2D X-ray views of the casting to reconstruct the 3D geometry of selected features. The large cross sections and long path lengths inherent in large utility land based components will be particularly challenging.

Copyright © 1997 by ASME
Topics: Casting , Turbines
This article is only available in the PDF format.

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