INFLUENCE OF MOULD DESIGN ON THE SOLIDIFICATION AND SOUNDNESS OF HEAVY FORGING INGOTS.

Abstract

Central porosities and loose structure are liable to increase when the rate of vertical solidification at the centerline exceeds about 10 mm/min, and defects are strengthened at the area where the rate is accelerated. For 0. 25%C-3. 5%Ni-Cr-Mo-V steel, 'A' segregation begins to form when the rate of transverse (horizontal) solidification decreases to about 0. 8 mm/min.