图1（a）VAR钢锭距A线下30 mm的一次枝晶间距，中心到边缘呈减小趋势，最大值为502.71 μm，最小值为132.09 μm；图1（b）VAR钢锭距A线下30 mm的二次枝晶间距，中心到边缘也呈不断减小趋势，最大值为78.13 μm，最小值为56.10 μm。

Fig. 1 (a) the primary dendrite spacing of 30 mm below the A-line of VaR ingot decreases from center to edge, and the maximum value is 502.71 μ m. The minimum value is 132.09 μ m； Fig. 1 (b) the secondary dendrite spacing of 30 mm below the a line of VaR ingot also shows a decreasing trend from the center to the edge, with the maximum value of 78.13 μ m. The minimum value is 56.10 μ m.