Heat flow parameters affecting the unidirectional solidification of pure metals |
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Authors: | M Prates J Fissolo H Biloni |
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Affiliation: | 1. Aerospace Technical Center (C.T.A.), S?o José dos Campos, Brazil 2. Materials Research Center (C.I.M.), Córdoba, Argentina 3. Solidification and Casting Division, Comisíon Nacional de Energía Atómica (C.N.E.A.), Buenos Aires, Argentina
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Abstract: | Unidirectional solidification of pure metals has been studied as a function of liquid superheat, heat transfer coefficient
of the metal/mold interface(h
i
), and mold material. Experimental results show that the position of the solid/liquid interface (X) varies with time (l) following the relationshipX(t) = A . t
1/2
-B, where, for a fixed metal,B is a constant only dependent on the superheat through a parabolic law andA is another constant that is independent of the superheat but dependent on the mold heat sink capacity,i.e., mold material and coefficienth
i
At the same time, it has been calculated that the constantA varies withh
i
through an error-function type law tending asymptotically to Lyubov’s exact analytic solution. |
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Keywords: | |
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