碳化铌的数量与铌的加入量有关。
钢中铌的沉淀析出具有沉淀强化和晶粒细化的作用。
And the precipitation of Nb has the effect of precipitation hardening and grain refinement.
计算结果表明：冷却速率对碳氮化铌的析出及长大有重要影响。
As a result, It is found that the cooling rate has great effect on the Nb (CN) nucleation and growth.
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