Solidification modeling of Nb bearing superalloys

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Description

The solidification behavior of experimental Ni base and Fe base superalloys containing Nb, Si, and C was studied using differential thermal analysis (DTA) and microstructural characterization techniques. The solidification reaction sequences responsible for microstructural development were found to be similar to those expected in the Ni-Nb-C ternary system, where the solute-rich interdendritic liquid exhibited two eutectic-type reactions at the terminal stages of solidification: L {yields} ({gamma} + NbC) and L {yields} ({gamma} + Laves). A pseudo ternary {gamma}-Nb-C approach was developed to provide a quantitative description of solidification behavior for these experimental alloys. Solute redistribution calculations in the model are ... continued below

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13 p.

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DuPont, J.N.; Marder, A.R. & Robino, C.V. August 1, 1997.

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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

The solidification behavior of experimental Ni base and Fe base superalloys containing Nb, Si, and C was studied using differential thermal analysis (DTA) and microstructural characterization techniques. The solidification reaction sequences responsible for microstructural development were found to be similar to those expected in the Ni-Nb-C ternary system, where the solute-rich interdendritic liquid exhibited two eutectic-type reactions at the terminal stages of solidification: L {yields} ({gamma} + NbC) and L {yields} ({gamma} + Laves). A pseudo ternary {gamma}-Nb-C approach was developed to provide a quantitative description of solidification behavior for these experimental alloys. Solute redistribution calculations in the model are based on a previous approach developed by Mehrabian and Flemings, with modifications made to account for the high diffusion rate of C in the solid. Solidification parameters for Nb and C were determined through DTA and electron probe microanalysis techniques and used as inputs to the model. Reasonable agreement is found between calculated volume fractions of the {gamma}/NbC and {gamma}/Laves constituents and those measured experimentally. The modeling results permit detailed descriptions of the relation between alloy composition and microstructural evolution during solidification.

Physical Description

13 p.

Notes

OSTI as DE97007150

Source

  • 4. international special emphasis symposium on superalloys 718, 625, 706 and derivatives, Pittsburgh, PA (United States), 15-18 Jun 1997

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  • Other: DE97007150
  • Report No.: SAND--97-1669C
  • Report No.: CONF-970605--3
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/515586 | External Link
  • Office of Scientific & Technical Information Report Number: 515586
  • Archival Resource Key: ark:/67531/metadc692840

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  • August 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 14, 2016, 12:45 p.m.

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DuPont, J.N.; Marder, A.R. & Robino, C.V. Solidification modeling of Nb bearing superalloys, report, August 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc692840/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.