Relations between Freezing Rate of Ingot and Segregations of Sulphur, Phosphorus, Oxygen and Nitrogen

Studies on the solidification of ingots-I

Abstract

In this report, relations between freezing rate and segregation of sulphur, phosphorus, oxygen and nitrogen on Fe-S, Fe-P, Fe-O and Fe-N systems were studied, and it was shown that in order to present segregation, freezing rates should be above 1.2mm/min, in case of oxygen and1.8mm/min, in cases of sulphur, phosphorus and nitrogen.
Calculation from measured results shows that the value of K₀ is 0.15 which is larger than old data, and σ/Ds=1.6-3.8×10³sec/cm, σ/D_p=1.1-3.4×10³sec/cm, σ/D_O=1.94×10³sec/cm and σ/D_N=1.15-10³sec/cm.