通过真空熔炼和气体保护, 采用熔融玻璃与循环过热相结合的深过冷快速凝固技术,研究了影响富Fe端Fe-B共晶合金熔体净化效果的主要因素, 确定了该合金熔体获得超过冷的净化方法, 并使Fe83B17共晶合金熔体稳定获得了300-460 K的超过冷度, 使Fe80B20过共晶合 金熔体的过冷度达到了485 K, 从而使Fe-B共晶系合金熔体开始形核前的初始过冷度达到了0.3m-0.4m的水平. 通过对冷却曲线的分析, 讨论了表征超过冷快速凝固的热力学特征.
Adopting the molten glass denucleating technology combined with high frequency vacuum melting, and cycle superheating, the main factors affecting purifying of the bulk Fe-rich side Fe-B eutectic alloy melt were investigated. The optimized purification and parameters for high undercooling and hypercooling were given out. The hypercoolings of 324K～460K have been obtained successfully in bulk Fe83B17 eutectic alloy melts, and 485K in Fe80B20 hypereutectic alloy melts. So the primary nucleation undercoolings of (0.3～0.4) Tm were obtained in bulk Fe-B eutectic system alloy melts. The thermodynamic characters of hypercooling rapid solidification were also discussed by analyzing the cooling curves.
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