CAJ | 학술논문

基于枝晶生长的扩散界面模型，改进元胞自动机法，并结合有限差分法，综合考虑浓度场、温度场以及熔池形状，建立 Fe-0.04%C(质量分数)合金枝晶生长和溶质浓度分布模型。模拟单个等轴晶的生长形貌及枝晶尖端生长速度随时间的变化关系、多个等轴晶的生长形貌和溶质浓度分布、柱状晶的生长形貌和耦合温度场后的柱状晶?等轴晶转变过程，并与实验进行对比。结果表明：取向角对枝晶形貌有一定的影响；枝晶尖端生长速度随时间的延长最后趋于稳定；熔池形状影响柱状晶生长形貌；溶质主要富集在枝晶根部及晶界处。模拟结果与实验结果吻合较好。
기우지정생장적확산계면모형，개진원포자동궤법，병결합유한차분법，종합고필농도장、온도장이급용지형상，건립 Fe-0.04%C(질량분수)합금지정생장화용질농도분포모형。모의단개등축정적생장형모급지정첨단생장속도수시간적변화관계、다개등축정적생장형모화용질농도분포、주상정적생장형모화우합온도장후적주상정?등축정전변과정，병여실험진행대비。결과표명：취향각대지정형모유일정적영향；지정첨단생장속도수시간적연장최후추우은정；용지형상영향주상정생장형모；용질주요부집재지정근부급정계처。모의결과여실험결과문합교호。
Based on the diffusive interface model of dendritic growth, a new model of dendrite growth and solute concentration distribution of Fe-0.04%C (mass fraction) alloy was developed by the improved cellular automaton method, combined with the finite difference method, considered concentration field, temperature field and the shape of molten pool. This model simulated the growth morphologies of a single equiaxial crystal, the relationships between dendrite tip growth and time, multiple equiaxial crystals growth morphologies and solute concentration distribution, the growth of columnar crystal, columnar-to-equiaxed transition after coupling temperature field, and compared with the experimental results. The results indicate that the orientation angles have certain influence on dendrite morphologies, the dendrite tip growth rate tends to be stable with the extension of time in the end, the shape of molten pool influences the growth morphologies of columnar crystals, the solute concentrate in the dendrite roots and grain boundaries. The simulation results are in accord with the experimental ones well.