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.
钎焊焊缝的枝晶间显微疏松导致的应力集中与微裂纹效应以及近焊缝区母材晶粒长大是导管早期疲劳开裂的主要原因。
The results show that the crack initiates at the outer surface of the weld comer and propagates into the steel base material with a high cycle fatigue mode.
实验结果表明，合金的组织随着B加入量的增加变得粗大，当B加入量为0.05%时出现粗大枝晶，0.1%时枝晶进一步长大且出现二次枝晶。
When the B content is 0.05%, the coarse dendrite is found in cast structure of alloy, When B content is up to 0.1%, dendrites grow further and secondary dendrites appear.
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