Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Critical conditions for the Formation of "A" Segregation in Forging Ingots
Hitohisa YAMADATakashi SAKURAITomoo TAKENOUCHI
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1989 Volume 75 Issue 1 Pages 97-104

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Abstract

Quality of forging products is greatly affected by macrosegregations such as "A" segregation which tends to appear in large ingots. From the points of quality control and assurance, therefore, it is important to establish a method to predict formation of "A" segregation in ingots. For this purpose, twelve commerical ingots of different sizes and steel grades are investigated. Further experiments are carried out, by producing "A" segregation in small ingots, to study the effects of alloying elements. The results show that the critical location of the formation of "A" segregation differs with grades of steel. The location is determined not only by the liquid density difference but also by the coarseness of dendrites. In the case of lowalloy steels, secondary dendrite arm spacings have to be as big as 560 micron meters for the formation of the segregation. Meanwhile the vanishing location of the segregation in the center of ingots is determined by the radius of ingot regardless of grades of steel.

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© The Iron and Steel Institute of Japan
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