仿晶界铁素体长大动力学及典型形貌的相场模拟  

Phase field molding on the morphologies and growth kinetics of grain boundary ferrite allotriomorphs

作　　者：张星[1] 陆海明 李传维[3] 顾剑锋[2,4] ZHANG Xing;LU Haiming;LI Chuanwei;GU Jianfeng(Institute of Materials Modification and Modelling,Shanghai Jiao Tong University,Shanghai 200240,China;Materials Genome Initiative Center,Shanghai Jiao Tong University,Shanghai 200240,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学材料改性与数值模拟研究所,上海200240 [2]上海交通大学材料基因组联合研究中心,上海200240 [3]上海交通大学高新船舶与深海开发装备协同创新中心,上海200240 [4]上海交通大学上海市激光制造与材料改性重点实验室,上海200240

出　　处：《中国科技论文》2018年第4期456-462,共7页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20130073120062)

摘　　要：利用相场法研究了2个形核位置临近的仿晶界铁素体的典型形貌和单个铁素体晶粒的长大动力学。根据相间取向关系确定了不同奥氏体、铁素体晶粒间的取向差,由此计算得到基于相和取向差的界面能和迁移速度。模拟结果表明,对于2个形核位置临近的铁素体核心,核心长大后具有3种典型的铁素体形貌;基于Horval-Cahn模型,研究了温度和界面能对单个仿晶界铁素体长度和厚度方向长大动力学的影响,结果表明温度对仿晶界铁素体长度和厚度方向的长大均有较大影响,界面能对厚度方向的长大影响不显著。The typical morphologies and the growth kinetics of the grain boundary ferrite allotriomorphs based on phase field method(PFM)have been investigated.Different misorientations between the austenite and the ferrite grains were determined by specific orientation relationship,and the phase and misorientation-dependent interfacial energy and mobility were calculated.The simulation results showed three typical morphologies of two neighboring allotriomorphs.The growth kinetics was obtained from the change of the length and the thickness by Horval-Cahn model.The effect of temperature and interphase boundary energy on the kinetics and morphologies of the allotriomorph were discussed in detail.The results indicated that temperature affected the growth of the allotriomorph on both the length and the thickness while the growth of thickness cannot be affected obviously by the interphase boundary energy.

关 键 词：金属材料工程 仿晶界铁素体 相场法 长大动力学 形貌 

分 类 号：TG142.1[一般工业技术—材料科学与工程]