The evolution of the ancient craft of lost wax casting into present investment casting practice, associated with a trend from the production of artistic artefacts to the manufacture of critical load bearing components, has resulted in progressive improvements in the mechanical integrity of the castings through systematic microstructural control. In this paper, the factors which influence the principal microstructural characteristics (porosity, grain size and shape, segregation, crystal texture) and the effects of those features on various mechanical properties are examined.
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