Grey cast iron belongs to materials for casting production, which have wide application for different industry branches. Wide spectrum of
properties of these materials is given by the structure of base metal matrix, which can be influenced with heat treatment. Processes of
annealing can be applied for grey cast iron without problems. During heat treatment processes, where higher cooling rates are used, the
thermal and structural strains become important. Usage and conditions of such heat treatment for grey cast iron castings of common
production are the subject of evaluation of this article.
Homogeneity of die castings is influenced by wide range of technological parameters as piston velocity in filling chamber of die casting machine, filling time of mould cavity, temperature of cast alloy, temperature of the mould, temperature of filling chamber, surface pressure on alloy during mould filling, final pressure and others. Based on stated parameters it is clear, that main parameters of die casting are filling time of die mould cavity and velocity of the melt in the ingates. Filling time must ensure the complete filling of the mould cavity before solidification process can negatively influence it. Among technological parameters also belong the returning material, which ratio in charge must be constrained according to requirement on final homogeneity of die castings. With the ratio of returning material influenced are the mechanical properties of castings, inner homogeneity and chemical composition.