Closed loop control techniques for the growth of single crystal turbine components

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Description

Analysis of processes used for the production of single crystal turbine components reveals significant shortcomings. Inadequate consideration has been made of the fact the system is cooling dominated and that the amount of cooling tends to increase as the emissive cooling area expands during the process. Experimental evidence suggests that during processing, this increased cooling causes the solidification interface to move away from the baffle and become curved. The motion of the interface results in a decrease in the solidification gradient. The combination of these actions can result in variations in PDAS (primary dendrite arm spacing), grain misalignment and the ... continued below

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20 p.

Creation Information

Schlienger, M.E. December 31, 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Analysis of processes used for the production of single crystal turbine components reveals significant shortcomings. Inadequate consideration has been made of the fact the system is cooling dominated and that the amount of cooling tends to increase as the emissive cooling area expands during the process. Experimental evidence suggests that during processing, this increased cooling causes the solidification interface to move away from the baffle and become curved. The motion of the interface results in a decrease in the solidification gradient. The combination of these actions can result in variations in PDAS (primary dendrite arm spacing), grain misalignment and the production of defects. It is shown that despite this tendency, microstructural stabilization may be achieved through the use of the heat of fusion as an internal process heat source.

Physical Description

20 p.

Notes

OSTI as DE96007000

Source

  • Superalloys `96, Seven Springs, PA (United States), 22-26 Sep 1996

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  • Other: DE96007000
  • Report No.: SAND--95-2332C
  • Report No.: CONF-960992--1
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/266711 | External Link
  • Office of Scientific & Technical Information Report Number: 266711
  • Archival Resource Key: ark:/67531/metadc672155

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • December 31, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

Description Last Updated

  • April 13, 2016, 1:06 p.m.

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Schlienger, M.E. Closed loop control techniques for the growth of single crystal turbine components, report, December 31, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc672155/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.