1987 Volume 73 Issue 9 Pages 1125-1132
Aluminum-killed-steel slab ingots, whose weight was 5 to 40 t with various chemical compositions, were cast in order to investigate the influence of ingot shape and chemical composition on the formation of inverse-V segregation.
Manganese content in the cross section of segregated streakes were obtained by line analysis with EPMA.
The results were as follows:
1) The average number of inverse-V segregation in the ingots had a relationship with ingot thickness D(mm) and density-change coefficient(ε), as shown in the next formula.
N2070 = - 21.57 + 52.84 ε + 0.025D
2) Inverse-V segregation streakes concentrated below the hot top in big-end-up ingots of larger wide face taper and taller ingots.
3) Inverse-V segregation was assumed to be formed by the interdendritic fluid flow in the region which had the fraction of solid between 0.51 and 0.86.