A Process Sensor for Locating the Liquid-Solid Boundary through the Mold of a Casting

  • D. W. Fitting
  • W. P. Dubé
  • T. A. Siewert
  • J. Paran

Abstract

Accurate process control of single-crystal and directionally-solidified castings requires knowledge of the exact location of the solidifying front. If the front advances too rapidly, single crystal growth in a preferred orientation degenerates into the formation of polycrystals. A solidification front which moves more slowly than necessary is wasteful of the casting resources. A sensing technology is being developed which determines the location of the boundary between a solidifying crystal and liquid metal. The sensing method utilizes the ordered pattern of x-rays diffracted from the solid as an absolute indicator of the liquid-crystal interface.

Keywords

Nickel Quartz Furnace Zirconium Attenuation 

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Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • D. W. Fitting
    • 1
  • W. P. Dubé
    • 1
  • T. A. Siewert
    • 1
  • J. Paran
    • 1
  1. 1.Materials Reliability Division, Materials Science and Engineering LaboratoryNational Institute of Standards and TechnologyBoulderUSA

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