polycrystalline layer

• 聚晶层

polycrystalline layer的用法和样例：

例句

1. Experiment results show that removing the surface broken crystal layer of the cold drawn rod can prevent heat treatment induced cracks.
   实验结果表明，热处理前去掉冷拉棒表面的碎晶层可以防止它在热处理过程中产生裂纹。