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采用落管无容器处理和单辊急冷技术研究了三元Fe-18.5%Mo-28.5%Si共晶合金的深过冷快速凝固。结果表明,快速凝固合金的微观组织均由MoSi2、τ1(Fe5MoSi4)和FeSi 3相组成。在自由落体条件下,随着液滴直径的减小,合金的凝固组织由两种二相共晶(MoSi2+τ1)和(MoSi2+FeSi)向细小不规则的3相(MoSi2+τ1+FeSi)共晶转变;而在单辊急冷快速凝固条件下,三元共晶的凝固组织则以柱状晶为特征。随着冷却速率的增大,三元共晶组织都发生了显著的细化。
Deep-undercooling and rapid solidification of ternary Fe-18.5% Mo-28.5% Si eutectic alloy was investigated by dropless tubeless vessel processing and single roll rapid cooling. The results show that the microstructures of the rapidly solidified alloys consist of MoSi2, τ1 (Fe5MoSi4) and FeSi3 phases. Under the condition of free fall, the solidification microstructure of the alloy is composed of two kinds of two-phase eutectic (MoSi2 + τ1) and (MoSi2 + FeSi) to the small and irregular three phases (MoSi2 + τ1 + FeSi ) Eutectic transformation. In the case of single-roll rapid solidification, the solidification structure of the ternary eutectic is characterized by columnar crystals. As the cooling rate increases, the ternary eutectic microstructure has been significantly refined.