Meantime it finds out property change reason of coarse crystal area from welding coarse crystal area structure change and puts forward the direction of toughness.

同时，还从焊接粗晶区组织变化中找出了粗晶区性能变化的原因，并提出了韧化方向。

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The results showed that the metallurgical defects such as inclusions, coarse crystal grains and asymmetry of the grain size were the main reason resulting in fracture of the steel rods during drawing.

结果表明，原材料中存在的夹杂物、晶粒粗大及混晶等冶金质量缺陷是盘条在拉拔过程中发生断裂的主要原因。

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On the surface of some jade ornament or crystal with coarse grain structure, the microscopic fissure can be formed along the cleavage.

在有些结晶颗粒较粗的翡翠饰品表面，硬玉晶体上可见沿解理形成的微细裂纹。

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