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.

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。

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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.

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。

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