Effects of Melt Cyclical Superheating Conditions on the Microstructure of FeSi₂ Alloy

Abstract:

In order to avoid coarse primary-precipitated ε phase which prolong α+ε→β phase transition time in FeSi₂ material prepared by conventional casting, a cyclical superheating process of melt for preparing FeSi₂ with complete α+ε eutectic structure was proposed. The effects of melt superheating conditions on the microstructure of FeSi₂ were investigated. The results showed that, with the increase of the superheating temperature, the superheating time, the recycling times and the cooling velocity, the size and quantity of the ε phase reduced. Meanwhile, the number of the fine eutectic structure increased. FeSi₂ sample with uniform and complete α+ε eutectic structure was successfully prepared in the conditions of melt superheating temperature at 1550°C, superheating time for 10mins, recycling 3 times,melt cooling rate of 30°C/s.

• Periodical: Materials Science Forum (Volume 789)
• Pages: 320-327
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.789.320
• Online since: April 2014
• Authors: Chi Zhang, Zhi Hao Zhang*, Zhi Peng Jiang, Wei Li Wang, Jian Xin Xie
• Keywords: Cyclical Superheating, Eutectic Structure, FeSi₂ Alloy, Primary-Precipitated Phase

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