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Abstract
Experiments were carried out to investigate the nodularizing effect of magnesium in magnesiumtreated cast irons. The presence of magnesium gas bubbles in the melt and the pressure dependence of the nodularizing effect of magnesium were examined using a pressure vessel. All the experimental results are satisfactorily explained by the gas bubble theory and it is clear that magnesium gas bubbles are responsible for the nodularization of graphite in cast irons treated with magnesium and its alloys.
