Effect of experimental variables on casting fluidity and fluid life of liquid tin
1985; Maney Publishing; Volume: 1; Issue: 5 Linguagem: Inglês
10.1179/mst.1985.1.5.398
ISSN1743-2847
Autores Tópico(s)Materials Engineering and Processing
ResumoAbstractAbstractThe extent and duration of flow (casting fluidity and fluid life) of liquid tin along tubular Pyrex moulds has been measured as a function of melt superheat, mould bore, and mould material for injection under reduced pressure, gravity, and positive pressure, both with and without prior stirring of the injected melt. Macrostructural examination of the resulting fluidity samples showed that cessation of flow was triggered by sufficient inward penetration of columnar growth (vein-closure mechanism) at some distance from the mould entrance except when stirring of the melt had been carried out at low superheat before injection. In that case, growth was fully equiaxed and within the flowing stream so that cessation of flow was then expected to be governed by sufficient solidification at the advancing tip of the flowing stream. Comparison of measured fluid life with predictions of time to complete freezing in a cylindrical mould suggests that freezing occurred under heat-transfer conditions intermediate between Newtonian and ideal.MST/79
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