二次枝晶臂间距变化不明显。
However, the second dendrite arm spacing (SDAS) changes little.
模型除了描述了晶粒的生长，同时还描述了枝晶臂的粗化。
The improved model not only describes grain growth, but also describes coarsening of dendrite arms.
冷却速率越大或预变形处理以后的试样在熔化过程中更容易发生二次枝晶臂之间的合并。
The more the increase of cooling rate or pre-deformation, the more the secondary dendrite arms are easy to coarsen.
结合实验和模拟结果，得出该合金的晶粒尺寸、一次枝晶间距、二次枝晶臂间距随冷却速率增大而明显减小。
The results show that the grain average size and the primary and secondary dendrite arm space were obviously reduced with the increase of cooling rate.
浇注温度提高，枝晶臂的长大速度增大，上述物理冶金作用能够部分细化球化奥氏体，但其圆整度较差，尺寸较大。
With the increasing of casting temperature, the dendrites grew fast, which could spheroidize and fine partial austenite with worse circularity and bigger size.
研究枝晶二次臂间距对于提高铸件力学性能有重要意义。
Research on secondary arm spacing has important significance for improving the mechanical properties of castings.
研究枝晶二次臂间距对于提高铸件力学性能有重要意义。
Research on secondary arm spacing has important significance for improving the mechanical properties of castings.
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