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采用玻璃熔覆法使Fe-Ni-P-B共晶合金在不同过冷度条件下凝固,研究了其组织随过冷度的演化规律。结果表明,随着过冷度的增加,凝固组织形态逐渐从棒状规则共晶向不规则的粒状共晶组织转化。当T<35 K时,棒状规则共晶组织随过冷度增加而逐渐细化;当35 K150 K时,获得完全非规则共晶组织。应用Jackson-Hunt共晶生长模型和枝晶熔断理论,对Fe-Ni-P-B共晶合金凝固组织形成机制进行了分析讨论。
The glass-cladding method was used to solidify Fe-Ni-P-B eutectic alloy under different undercooling conditions. The evolution of microstructure of the Fe-Ni-P-B alloy with undercooling was studied. The results show that with the increase of undercooling, the solidified microstructure gradually changes from rod-shaped eutectic to irregular granular eutectic. When T <35 K, the rod-shaped regular eutectic microstructure is refined with the increase of undercooling degree. When 35 K 150 K, completely irregular eutectic structure is obtained. The formation mechanism of solidification structure of Fe-Ni-P-B eutectic alloy was analyzed and discussed by using the Jackson-Hunt eutectic growth model and dendrite fusion theory.