熔体流动方向对Fe-C合金枝晶生长的影响  

Influence of Melten Flow Direction on Dendrite Growth of Fe-C Alloy

作　　者：袁训锋[1,2] 

机构地区：[1]商洛学院物理与电子信息工程系,陕西商洛726000 [2]商洛学院陕西省尾矿资源综合利用重点实验室,陕西商洛726000

出　　处：《热加工工艺》2014年第21期65-67,71,共4页Hot Working Technology

基　　金：陕西省教育科学"十二五"规划资助项目(SGH13401);商洛学院博士启动基金资助项目(12SKY01-1);陕西省教育厅专项科研计划资助项目(14JK1223)

摘　　要：采用熔体流动的相场模型,模拟了Fe-C合金等温凝固中的枝晶生长过程,研究了流动方向对枝晶生长行为的影响。结果表明:在流动方向与晶粒优先生长方向平行时,晶粒第一、二象限的主枝和侧枝粗大,第三、四象限的主枝和侧枝细小。随着流动方向与枝晶优先生长[100]方向夹角θ0的增加,晶粒第一、四象限的侧枝数量增加且生长迅速,第二、三象限的侧枝退化;同时,[100]方向枝晶臂长度减小,溶质浓度降低,[-100]方向枝晶臂长度增加,溶质浓度先减小后增加。The dendrite growth process during isothermal solidification of Fe-C alloy was simulated by using the phase field model of melten flow. And the effects of flow direction on the dendrite growth were studied. The results show that the principal branch and side-branches become thick in the first and second quadrant of grain and small in the third and fourth quadrant when the flow direction is parallel to preferentially growing directions. With the increasing of the angle （00） between flow direction and the preferentially growing directions of grain, side-branches increase and grow fast in the first and fourth quadrant of grain, but degenerate in the second and third quadrant of grain. Meanwhile, the length of dendrite arms and the tip solute concentration decrease along [100] direction; the length of dendrite arms increases along [-100] direction, and solute concentration decreases first and then increases.

关 键 词：相场 FE-C合金 枝晶生长 流动方向 

分 类 号：TG244.3[金属学及工艺—铸造]