横向约束对Fe-C合金凝固微观组织的相场法模拟  

Simulation of phase field method for solidification microstructure of Fe-C alloy by lateral constraint

作　　者：冯力[1,2] 王军 朱昶胜[1] 仲军和 安国升[1] FENG Li;WANG Jun;ZHU Chang-sheng;ZHONG Jun-he;AN Guo-sheng(College of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2020年第5期13-20,共8页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(11504149,51661020)。

摘　　要：以Fe-C二元合金为例,采用多相场法模拟了横向约束条件下枝晶与共析组织微观形貌的演化过程,探讨了横向约束的长度、厚度对枝晶与共析组织生长形貌的影响.结果表明:横向约束的存在限制了枝晶和共析组织的正常生长,横向约束上方的微观组织形貌明显改变;随着横向约束长度的增加,横向约束上方的枝晶间距明显减小,共析组织的层间距越来越大;随着横向约束厚度的增加,横向约束上方新枝晶的生长速度降低,共析组织中Fe3C相偏转增大,使得层间距变大.Taking Fe-C binary alloy as an example,the evolution process of dendrite and eutectoid microstructure under transverse restraint was simulated in this study by adopting the multiphase field method.The influence of length and thickness of transverse restraint on growth morphology of dendrite and that of eutectoid microstructure was discussed in terms of simulated microstructures.All results coming from our simulation indicate:The normal growth of dendrite and eutectoid is limited by the existence of transverse constraint,and the morphology of microstructure above the transverse constraint changes obviously;With the increase of the length of transverse constraint,the dendrite spacing above the transverse constraint decreases obviously,and the layer spacing of the eutectoid structure becomes larger as a result;With the increase of transverse constraint thickness,the growth rate of new dendrites above transverse constraints decreases,and the deflection of Fe3C phase in eutectoid structure increases,resulting in larger interlayer spacing.

关 键 词：相场法 FE-C合金 横向约束 枝晶形貌 共析组织 

分 类 号：TG244[金属学及工艺—铸造] TG248