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Solidification of Nb-bearing superalloys: Part I. Reaction sequences

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Abstract

The solidification reaction sequences of experimental superalloys containing systematic variations in Fe, Nb, Si, and C were studied using differential thermal analysis (DTA) and microstructural characterization techniques. The reaction sequences responsible for microstructural development were found to be similar to those expected in the Ni-Nb-C ternary system and commercial superalloys of comparable composition. The solute-rich interdendritic liquid generally exhibited two eutectic-type reactions at the terminal stages of solidification: L → (γ+NbC) and L → (γ+Laves). The Ni-base alloys with a high C/Nb ratio represented the only exception to this general solidification sequence. This group of alloys terminated solidification with the L → (γ + NbC) reaction and did not exhibit the γ/Laves constituent. At similar levels of solute elements (Nb, Si, and C), the Fe-base alloys always formed more of the γ/Laves eutectic-type constituent than the corresponding Ni-base alloys. Silicon additions also increased the amount of the γ/Laves constituent that formed in the assolidified microstructure, while C additions promoted formation of γ/NbC. The influence of Nb was dependent on the C content of the alloy. When the C content was low, Nb additions generally promoted formation of γ/Laves, while Nb additions to alloys with high C led to formation of the γ/NbC constituent. The results of this work are combined with quantitative analyses for developing γ-Nb-C pseudoternary solidification diagrams in a companion article.

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Authors and Affiliations

  1. Energy Liaison Program, Lehigh University, 18015, Bethlehem, PA

    J. N. DuPont (Research Scientist and Associate Director)

  2. Materials Science and Engineering Department, Lehigh University, 18015, Bethlehem, PA

    M. R. Notis (Professor) & A. R. Marder (Professor)

  3. the Technical Staff, Sandia National Laboratories, 87185, Albuquerque, NM

    C. V. Robino (Principal Member) & J. R. Michael (Principal Member)

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  1. J. N. DuPont
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  2. M. R. Notis
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  3. A. R. Marder
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  4. C. V. Robino
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  5. J. R. Michael
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DuPont, J.N., Notis, M.R., Marder, A.R. et al. Solidification of Nb-bearing superalloys: Part I. Reaction sequences. Metall Mater Trans A 29, 2785–2796 (1998). https://doi.org/10.1007/s11661-998-0319-3

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