ON THEORY OF THE MODIFICATION OF ALLOYS WITH ULTRA-FINE POWDERS OF REFRACTORY COMPOUNDS

A mathematical model of the behavior of the refractory-compound powder panicles in overheated melt is suggested. The obtained analytical sol ution to the problem of quasi-steady diffusion of the compound compone nts in melt allow one to calculate the rime for the complete dissoluti on of the particle. In addition. the conditions when the solidificatio n on particles begins before the solidification of the basic alloy. i. e.. at temperatures above the liquidus temperature of the alloy are es tablished. The relationships describing the growth of solid phase on p anicles and permitting one to determine the conditions of the formatio n either of globular structure or of mixed structure are obtained.