ON THE Λ SEGREGATED ZONE OF LARGE CARBON STEEL INGOT (II)

Mechanism of Formation of the Λ Segregated Line. Part-1

Abstract

The author tried to describe the mechanism of formation of the segregates in the Λ segregated zone on the basis of results of the observation about the d segregated zone of 20t steel ingots. Impurity-rich drops of molten steelobeing in contact with the solidified shell tended to float upwards, interrupting growth of dendritic crystals, and some of them obstructed to float became segregated facets.
This obstacle of floating resulted in the Λ-inclination of segregated facet.
Supposing that the segregated line was nothing but the abnormally grown segregated facet, the author described the transformation of segregated facets to lines and the growth of the latter. Finally, mentioning of the solidifying speed, the casting condition, the content of hydrogen in molten steel and the alloying elements as the main factors controlling the formation of segregates, he considered about the effects of each factor.