TY - JOUR
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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U2 - 10.1016/S0022-0248(96)01069-X
DO - 10.1016/S0022-0248(96)01069-X
M3 - Article
AN - SCOPUS:0031547770
VL - 177
SP - 145
EP - 161
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
SN - 0022-0248
IS - 1-2
ER -