ON THE Λ SEGREGATED ZONE OF LARGE CARBON STEEL INGOTS (I)

Investigation of the Λ Segregated Zone of 20t Steel Ingots (Part-1)

Abstract

One of the important defects in the large carbon steel forging is the one relating, to the Λ segregated zone of the ingot from which the forging is forged. The reason why it has been very difficult from earlier time to control this defect, lies in the fact, that any definite theory on the mechanism of appearance of the Λ segregated zone in ingots has been unable to be established. Investigating into the Λ segregated zone of 20t ingot in order to get some clue of the problem relating to segregated zone, the author found several facts, which were regarded as valuable for a consideration about the appearance of segeregates, that is, the existence of a large number of segregated faces besides segregated lines in the Λ segregated zone, the relation between segregates and primary crystals, the characteristics of structure of segregates etc.