Modeling solute redistribution and microstructural development in fusion welds of Nb-bearing superalloys

DuPont, J. N.; Robino, C. V.; Marder, A. R.

doi:10.1016/s1359-6454(98)00123-2

Cited by 77 publications

(59 citation statements)

References 8 publications

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“…This result is in accordance to the experimentally determined trend reported by Yang et al 20 for commercial superalloys with different amounts of Fe, and with the redistribution modeling results reported by DuPont et al 21 (a)…”

Section: Comparing With Theoretical Valuessupporting

confidence: 93%

Investigation of the Partition Coefficient in the Ni-Fe-Nb Alloys: A Thermodynamic and Experimental Approach

Valdés

Kim

Shang³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The Nb containing Ni-based superalloys used for the production of large castings are highly sensible to the formation of macrosegregation defects like freckles and white spots. Production cost can be reduced by better prediction of the freckle formation. The most accepted freckling criterion is the one based on the Rayleigh number, which requires accurate determination of the partition coefficients for the solute elements. In this work, the partition coefficients of Nb and Fe on the ternary system Ni-FeNb were studied by experimental measurements and by thermodynamic calculations. Modified DTA experiments were performed for model alloys, and a thermodynamic database for the Ni-Fe-Nb ternary system was developed. Most of the calculated partition coefficients using the developed model agree well with the experimental data. One exception to this, as will be discussed later, is the partitioning coefficient of Fe for the alloy containing 36 wt. %Fe.

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Section: Comparing With Theoretical Valuessupporting

confidence: 93%

Investigation of the Partition Coefficient in the Ni-Fe-Nb Alloys: A Thermodynamic and Experimental Approach

Valdés

Kim

Shang³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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“…Laves phases and Nb-carbides NbC are known to form in eutectic reactions. The systematic study by DuPont et al [141][142][143], spanning from DTAexperiments and microsegregation analysis of fusion welded samples to modeling microsegregation and phase formation along the solidification path of various alloys, highlights the major role played by carbon.…”

Section: The Solidification Path and Microstructure Formationmentioning

confidence: 99%

Multiphase solidification in multicomponent alloys

Hecht

Gránásy

Pusztai

et al. 2004

Materials Science and Engineering: R: Reports

165

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“…The partitioning of Nb, Mo and Ti in the dendrite interstices during solidification (i.e., partition coefficient, k<1) promoted appreciable compositional variations in the solidification grain and substructural boundaries and the formation of terminal eutectic constituents (γ/NbC and γ/Laves) in the last-to-solidify regions [7][8][9][10][11][12]. The formation of the g/ Laves constituent results in a substantial suppressing of the final solidification temperature.…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Effect of dilution on the behavior of solidification cracking in PTAW overlay deposit on Ni-Base superalloys

et al. 2002

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In this study, the effects of dilution on the solidification cracking susceptibility of PTAW (Plasma Transferred Arc Welding) Inconel 625 and 718 overlay on Nimonic 80A were observed. In order to evaluate solidification cracking susceptibility, the Varestraint test was utilized. A possible mechanism of solidification cracking was suggested on the basis of microstructural examination and thermal analysis. The present study showed that the solidification cracking of the diluted Inconel 625 and 718 with Nimonic 80A was closely related to the solidification temperature range and the amount and distribution of γ/NbC and γ/Laves eutectic phases formed along the solidification grain boundaries. As dilution increased, the C/Nb ratio increased and the amount of eutectic phases decreased. In addition, the solidification temperature range decreased with increasing dilution in each overlay.

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Modeling solute redistribution and microstructural development in fusion welds of Nb-bearing superalloys

Cited by 77 publications

References 8 publications

Investigation of the Partition Coefficient in the Ni-Fe-Nb Alloys: A Thermodynamic and Experimental Approach

Investigation of the Partition Coefficient in the Ni-Fe-Nb Alloys: A Thermodynamic and Experimental Approach

Multiphase solidification in multicomponent alloys

Effect of dilution on the behavior of solidification cracking in PTAW overlay deposit on Ni-Base superalloys

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