Nitrogen Solubility in Cast Iron Containing C, Si and Mn

Abstract

The nitrogen solubility in cast iron melt containing carbon, silicon and manganese was measured by the gas-liquid metal equilibration technique in the temperature range from 1 573 to 1 873 K. The nitrogen solubility in carbon saturated liquid iron decreased with increasing temperature due to the effect of carbon content increasing with temperature. The simultaneous effect of carbon, silicon and manganese on nitrogen was also measured to determine the second-order cross-product parameters of those alloying elements on nitrogen using the Wagner's interaction parameter formalism. The critical nitrogen content to form nitrogen gas bubbles during the solidification of cast iron for various melt composition can be predicted using thermodynamic parameters determined in the present study.