Macrosegregation patterns in multicomponent Ni-base alloys

S. D. Felicelli; D. R. Poirier; J. C. Heinrich

doi:10.1016/S0022-0248(96)01069-X

Macrosegregation patterns in multicomponent Ni-base alloys

S. D. Felicelli, D. R. Poirier, J. C. Heinrich

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

A mathematical model of the dendritic solidification of multicomponent alloys, that includes thermosolutal convection and macrosegregation, is presented. The model is an extension of one previously developed for binary alloys. Numerical simulations are given for ternary and quaternary Ni-base alloys, and the evolution of macrosegregation during solidification is studied. The results show that the segregation patterns vary greatly with cooling conditions, adopting several shapes and levels of intensity. Calculations of segregation in rectangular molds and in molds with smooth and abrupt variations of the cross sections exhibit significant differences in the distribution of macrosegregation due to the change in geometry. In addition, the segregation patterns are found to be particularly sensitive to the values of the equilibrium partition coefficients of the alloy components.

Original language	English (US)
Pages (from-to)	145-161
Number of pages	17
Journal	Journal of Crystal Growth
Volume	177
Issue number	1-2
DOIs	https://doi.org/10.1016/S0022-0248(96)01069-X
State	Published - May 1997

ASJC Scopus subject areas

Condensed Matter Physics
Inorganic Chemistry
Materials Chemistry

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10.1016/S0022-0248(96)01069-X

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title = "Macrosegregation patterns in multicomponent Ni-base alloys",

abstract = "A mathematical model of the dendritic solidification of multicomponent alloys, that includes thermosolutal convection and macrosegregation, is presented. The model is an extension of one previously developed for binary alloys. Numerical simulations are given for ternary and quaternary Ni-base alloys, and the evolution of macrosegregation during solidification is studied. The results show that the segregation patterns vary greatly with cooling conditions, adopting several shapes and levels of intensity. Calculations of segregation in rectangular molds and in molds with smooth and abrupt variations of the cross sections exhibit significant differences in the distribution of macrosegregation due to the change in geometry. In addition, the segregation patterns are found to be particularly sensitive to the values of the equilibrium partition coefficients of the alloy components.",

author = "Felicelli, {S. D.} and Poirier, {D. R.} and Heinrich, {J. C.}",

note = "Funding Information: 1 Visiting Scientist, on leave from Centro Atomico Bariloche, 8400 Bariloche. Argentina, and fellowship holder of Consejo Nacional de lnvestigaciones Cientificas y Tecnicas de la Reptib-lica Argentina. Funding Information: This work was supported by the Advance Research Project Agency, under the Micromodeling Program of the Investment Casting Cooperative Arrangement, under contract MDA972-93-2-0001. The authors appreciate the many discussions with Dr. A.F. Giamei, from United Technologies Research Center, for sharing his expertise in directional solidification and computational software. The provision of financial support to Sergio D. Felicelli by the Consejo Nacional de Inves-tigaciones Cientificas y Tecnicas (CONICET-Argentina) and by the Argentine Atomic Energy Commission, is gratefully acknowledged.",

year = "1997",

month = may,

doi = "10.1016/S0022-0248(96)01069-X",

language = "English (US)",

volume = "177",

pages = "145--161",

journal = "Journal of Crystal Growth",

issn = "0022-0248",

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T1 - Macrosegregation patterns in multicomponent Ni-base alloys

AU - Felicelli, S. D.

AU - Poirier, D. R.

AU - Heinrich, J. C.

N1 - Funding Information: 1 Visiting Scientist, on leave from Centro Atomico Bariloche, 8400 Bariloche. Argentina, and fellowship holder of Consejo Nacional de lnvestigaciones Cientificas y Tecnicas de la Reptib-lica Argentina. Funding Information: This work was supported by the Advance Research Project Agency, under the Micromodeling Program of the Investment Casting Cooperative Arrangement, under contract MDA972-93-2-0001. The authors appreciate the many discussions with Dr. A.F. Giamei, from United Technologies Research Center, for sharing his expertise in directional solidification and computational software. The provision of financial support to Sergio D. Felicelli by the Consejo Nacional de Inves-tigaciones Cientificas y Tecnicas (CONICET-Argentina) and by the Argentine Atomic Energy Commission, is gratefully acknowledged.

PY - 1997/5

Y1 - 1997/5

N2 - A mathematical model of the dendritic solidification of multicomponent alloys, that includes thermosolutal convection and macrosegregation, is presented. The model is an extension of one previously developed for binary alloys. Numerical simulations are given for ternary and quaternary Ni-base alloys, and the evolution of macrosegregation during solidification is studied. The results show that the segregation patterns vary greatly with cooling conditions, adopting several shapes and levels of intensity. Calculations of segregation in rectangular molds and in molds with smooth and abrupt variations of the cross sections exhibit significant differences in the distribution of macrosegregation due to the change in geometry. In addition, the segregation patterns are found to be particularly sensitive to the values of the equilibrium partition coefficients of the alloy components.

AB - A mathematical model of the dendritic solidification of multicomponent alloys, that includes thermosolutal convection and macrosegregation, is presented. The model is an extension of one previously developed for binary alloys. Numerical simulations are given for ternary and quaternary Ni-base alloys, and the evolution of macrosegregation during solidification is studied. The results show that the segregation patterns vary greatly with cooling conditions, adopting several shapes and levels of intensity. Calculations of segregation in rectangular molds and in molds with smooth and abrupt variations of the cross sections exhibit significant differences in the distribution of macrosegregation due to the change in geometry. In addition, the segregation patterns are found to be particularly sensitive to the values of the equilibrium partition coefficients of the alloy components.

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Macrosegregation patterns in multicomponent Ni-base alloys

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