定向凝固糊状区枝晶粗化和二次臂迁移的实验和模拟

方辉,薛桦,汤倩玉,张庆宇,潘诗琰,朱鸣芳

Dendrite Coarsening and Secondary Arm Migration in the Mushy Zone During Directional Solidification:

Hui FANG,Hua XUE,Qianyu TANG,Qingyu ZHANG,Shiyan PAN,Mingfang ZHU

表2 SCN-2.0%ACE合金在不同温度梯度条件下枝晶臂迁移速率的实验值和解析解比较

Table 2 Comparisons of experimental data and analytical predictions regarding the average migrating velocity within 18 s as a function of temperature gradient for a SCN-2.0%ACE alloy at V_p=0 μm/s and initial position y₀=5037 μm (Dimensionless initial position

{\tilde{y}}_{0}

=0.9)

Temperature gradient ℃·mm^-1	Average migrating velocity / (μm·s^-1)
Temperature gradient ℃·mm^-1	Experiment	Analytical solution	Relative error / %
7	0.61±0.064	0.74	17.6
8	0.72±0.076	0.85	15.3
9	0.85±0.094	0.96	11.5
10	0.89±0.073	1.07	16.8
11	0.94±0.076	1.18	20.3