凝固時に二次析出がおこる大型鋼塊の沈殿晶帯における介在物集積の機構と除去法 : 希土類元素添加鋼塊の凝固組織制御(<特集>大型鋼塊の製造と加工)

概要

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The solidification structure, solute segregation, constitution and distribution of inclusions in rare earth (RE) treated large ingots have been investigated. A concentration region, called "The Rare Earth Zone" which is bound by [%RE]/[%S]=2.7-8.0 and [%RE][%S]≦15×10^<-5> on RE vs. S coordinates, has been found to give a satisfactory sulphide shape control without causing any harmful accumulation of RE-sulphides and RE-oxysulphides in the sedimental zone of the ingots. A theoretical model has been given to successfully account for the sedimental zone accumulation, anomalous A-segregation, and the reversion, named "S-Reversal", of the segregation pattern in the RE-treated ingots. The constitution and origin of inclusions typical in the RE-treated ingots have also been interpreted in terms of the model supplemented by thermodynamic considerations.
1976-11-01