表面冷却速度 surface cooling rate 瞬时冷却速度 instantaneous cooling rate; momentary cooling rate ..
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The results indicate that the emerging surface crackle are due to the too rapid cooling rate.
研究结果表明表面裂纹是因冷却速率过快所造成的。
The present work shows that the nonuniform thickness of solidified skin of slab created by the nonuniform cooling rate of the skin in the crystallizer is main cause for slab surface cracking.
试验结果得知，坯壳在结晶器内冷却不均，使坯壳凝固层厚薄不同，是铸坯产生表面裂纹的主要原因。
The defects of sand-slag and gas-hole are absent in the water-cooling-sprayer whose surface is clean and qualified rate is more than 90%.
结果表明：铸件表面光洁，无砂眼、气孔等缺陷，铸件合格率高于90%；
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