COMPUTER-SIMULATION OF FE80B20 ALLOY SOLIDIFICATION IN THE MELT-SPINNING PROCESS

A numerical model based on the self-consistent solution of one-dimensi onal heat transfer equations and Kolmogorov's kinetic equation of mass crystallization is developed. The values of the constant involved in the equation of the homogeneous nucleation frequency and that of the l inear crystal growth rate for the Fe80B20 alloy as well as the wheel-r ibbon heat transfer coefficient were taken from experimental estimatio ns. The predicted Values of critical thickness (42 mu m), the critical rate of cooling (6.5 x 10(5) K/s), the volume fraction of crystallize d melt vs thickness and the number of quenched-in crystal per unit vol ume (4 x 10(16) - 8 x 10(18) m(-3)) are in a reasonable agreement with experimental data. It was shown that temperature of ribbon separation from the wheel above 0.45 T-m (T-m is melting temperature) considerab ly influences the structure of melt-spun ribbons.