Effect of Cooling Rate on Microstructure and Properties of Heat-Treated Fe₃Al Intermetallics

Abstract:

The casting Fe₃Al intermetallics were solidified in sodium silicate sand mould and permanent mould respectively to get different cooling rates. After heat treatment (1000°С/15 h homogenizing annealing + furnace cooling followed by 600°С/1 h tempering + oil quenching), the microstructure and properties of Fe₃Al intermetallics were investigated. The results show that the heat-treated Fe₃Al intermetallics at higher cooling rate has finer grained microstructure than lower cooling rate, and the lattice distortion increases due to the higher solid solubility of the elements Cr and B at higher cooling rate. The tensile strength and hardness of the Fe₃Al intermetallics at higher cooling rate are slightly higher also. However, the impact power of intermetallics at higher cooling rate is 67.5% higher than that at lower cooling rate, and the impact fracture mode is also transformed from intercrystalline fracture at lower cooling rate to intercrystallin+transcrystalline mixed fracture at higher cooling rate.

• Periodical: Advanced Materials Research (Volumes 189-193)
• Pages: 3891-3894
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.3891
• Online since: February 2011
• Authors: Ya Min Li, Hong Jun Liu, Yuan Hao
• Keywords: Cooling Rate, Fe₃Al, Heat Treatment, Microstructure, Property Analysis

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