结果表明，由于材料中存在长条状夹杂物及淬火冷却速度过快导致螺母开裂。
The result indicated that crack was caused by lath-shape inclusion in the material and high quenching rate.
对比分析认为，这两类长条状夹杂物均为含b2o3的低熔点氧化物塑性夹杂。
Comparative analysis showed that both of such long inclusions are low melting point plastic oxide inclusions containing B2O3.
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