Thermal and grain-structure simulation in a land-based turbine blade directionally solidified with the liquid metal cooling process View Full Text


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Article Info

DATE

2000-12

AUTHORS

A. Kermanpur, M. Rappaz, N. Varahram, P. Davami

ABSTRACT

The thermal field and the grain structure of a cored superalloy turbine blade, which has been directionally solidified with the liquid metal cooling (LMC) process, has been simulated in three dimensions using a cellular automaton (CA) coupled with finite-element (CAFE) model. The cooling induced by the liquid aluminum bath has been replaced by a heat-transfer coefficient, whose temperature- and time-dependence has been adjusted on the basis of natural convection simulations and dimensionless analyses. The simulated grain structure and crystallographic texture have been compared with the microstructure, and the electron back-scattered diffraction (EBSD) results were obtained for a real blade. In both the experiment and the simulation, it has been found that the grains do not exhibit a well-defined <001> texture, even near the top of the blade, mainly as a result of a concave liquidus surface. In order to improve the texture and decrease the number of stray crystals, the LMC process was then optimized by changing several parameters. The baffle geometry, the liquid bath level, and the thermal conductivity of the ceramic mold were found to be the dominant parameters. Using the optimized design, the effect of the withdrawal rate on the resulting grain structure was investigated. More... »

PAGES

1293-1304

References to SciGraph publications

  • 1976-09. Liquid metal cooling: A new solidification technique in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1997-06. An analytical model for optimal directional solidification using liquid metal cooling in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1959. Liquid-Metal Heat Transfer Media in NONE
  • 1995-06. Grain texture evolution during the columnar growth of dendritic alloys in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1996-03. Prediction of grain structures in various solidification processes in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1990-06. Analysis of solidification microstructures in Fe-Ni-Cr single-crystal welds in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1997-01. Electron backscattered diffraction investigation of the texture of feathery crystals in aluminum alloys in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s11663-000-0017-z

    DOI

    http://dx.doi.org/10.1007/s11663-000-0017-z

    DIMENSIONS

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