Fe-Ni-P-B共晶合金的深过冷凝固组织演化  

Microstructure Evolution of High Undercooled Fe-Ni-P-B Eutectic Alloy

作　　者：董晓晴[1] 张柯[1] 刘峰[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《铸造技术》2012年第2期139-143,共5页Foundry Technology

基　　金：国家自然科学基金资助项目(51071127)

摘　　要：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 K<T<150 K时,凝固组织由团状非规则共晶与棒状规则共晶构成,且随着过冷度增加非规则共晶逐渐增多,规则共晶组织减少,共晶间距增大;当T>150 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 high undercooled Fe-Ni-P-B eutectic alloy was obtained by glass fluxing technique.The evolution of microstructures at different undercoolings was researched.The results show that the solidification structure gradually transforms from regular rod eutectic to granular anomalous eutectic with the increase of undercooling.When the undercooling is lower than 35 K,the rod regular eutectic refines gradually.When the undercooling ranges between 35 K and 150 K,the structure is composed of regular eutectic and anomalous eutectic.When the undercooling exceeds 150 K,complete anomalous eutectic is obtained.The formation of different structures can be explained by J-H model and dendrite remelting.

关 键 词：Fe-Ni-P-B共晶合金 玻璃熔覆 过冷度 棒状共晶 非规则共晶 

分 类 号：TG111.4[金属学及工艺—物理冶金]