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UBC Theses and Dissertations

Aspects of mould design in electroslag casting Sathaye, Jayant Moreshwar


Electroslag casting is a process technique used to produce castings using electroslag melting. It is likely that channel cooled Aluminium moulds will be employed. Thus, the criteria for the design of moulds to be used in this process were examined. Temperatures in a mould section were measured and compared to those calculated from a model developed assuming 3-D quasi steady state heat flow and reasonable agreement was found. In the model the two major boundary conditions are the heat transfer coefficient to the coolant and the heat flux on the hot face. The former can be estimated from established correlations for heat transfer in tubes such as the Petukhov and the Sieder-Tate relations. The latter had to be measured and a heat flux sensor was developed for this. Proposals were made to qualitatively explain the heat flux variation along the mould height, but it was not possible to estimate the heat flux for a casting of arbitrary shape in a simple manner. According to the slag crystallisation mechanism proposed the influence of mould on the surface quality of the casting was found to be negligible.

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