Abstract
The relation of additional Al with combined nitrogen in Fe-C alloy, and influence of combined nitrogen upon the graphitizing ability of aluminum were investigated. The mechanism of graphitization of aluminum in Fe-C alloy depends upon both aluminum neutralizing the effect of combined nitrogen which has a chilling tendency and the graphitizing ability of aluminum itself. As the amount of Al increases, the quantity of N as AlN increases as much as over 80% of the combined nitrogen. The N as AlN is contained more in 6N-HCI insoluble nitrogen than in 6N-HCl soluble nitrogen. Insoluble Al in 6N-HCl is composed of both Al as Al2O3 and Al as AlN. Also, Al2O3 and AlN influence separation from melt.
