MICROSTRUCTURE OF THE INGOTS OF FE82PR12B6 ALLOY

Peculiarities of nonequilibrium solidification of Fe82PT12B6 alloy are considered together with their influence on the formation of a column ar structure in the ingots. It is difficult to form a columnar structu re in the ingots generally because of concurrent peritectic reactions in the alloys, accompanied by the precipitation of primary iron dendri tes. the latter interfacing with the directional growth of the columna r crystals. Increasing the cooling rate helps to eliminate those proce sses and, therefore, to achieve stronger supercooling effects of the m elt before its solidification.