EFFECT OF COMPOSITION AND PROPERTIES OF BRIQUETTED POWDER INOCULANTS ON THE FEATURES OF THEIR DISSOLUTION IN A MOLTEN ROLL-FOUNDRY IRON

Abstract

The features of dissolution of briquetted powder inoculants with different compositions (92% Fe–8% Mg; 42% Fe–8% Mg–50% Cu, and 92% Cu–10% Mg) in a roll-foundry iron melt, including their densities and geometric characteristics are investigated. It is shown that the dissolubility of briquetted inoculants in the melt decreases with increasing porosity from 8 to 15%, while increases with increasing porosity up to 30%. The introduction of copper into the composition of briquetted inoculants enhances their dissolution rate and degree of magnesium recovery by the iron melt. It is established that the application of Fe–Cu–Mg inoculants provides the maximum values of graphite particles shape factor and strength properties of the iron at optimal temperatures (1400 and 1420 ºC) for melt processing.