本文研究了化学成分和凝固后的冷却速度对V-Ti-N钢晶粒粗化温度(T_(GC))的影响。结果表明,微量Ti的加入可在钢中产生大量10um左右的细小含Ti颗粒,从而显著提高T_(GC)。当冷速大于某一临界值时,T_(GC)不随冷速的变化而升高。在模拟150mm连铸坯冷却条件时,T_(GC)对氮含量的变化不敏感。加入0.33wt-％Mo可使T_(GC)降低约100℃。T_(GC)对冷却条件的敏感性与Ti,N含量有关。
The effects of chemical composition and cooling rate after solidifi-cation on the grain coarsening temperature, T_(GC), of the V-Ti-N microalloying steelshave been investigated. It is shown that the T_(GC) may be obviously raised byadding even a little Ti to the base steels so as to precipitate a great deal of fineTi-bearing grains of about 10 nm. The T_(GC) does not increase with the cooling rate,as it is over a certain critical value. The T_(GC) is insensitive to any variation ofN content at simulated cooling condition of 150mm continuouscast slab. TheT_(GC) may be dropped down about 100℃ by adding 0.33 wt-% Mo to the steels.The sensitivity of T_(GC) to cooling condition is related with Ti and N contents.
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