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。

Figure 1 (a) The primary dendrite spacing of the VAR steel ingot 30 mm below the line A, with a decreasing trend from center to edge, with the maximum value of 502.71 μm and the minimum value of 132.09 μm; Figure 1 (b) the distance of the VAR steel ingot below the line A With a secondary dendrite spacing of 30 mm, the center to edge also shows a decreasing trend, with the maximum value of 78.13 μm and the minimum value of 56.10 μm.