Abstract: Theoretical calculation of Ostwald ripening regularity of Ti (C, N) in 0. 2% C, 0. 004% ~ 0. 008% N, 0. 02% 〜0. 05% Ti microalloying steel at 850 ~ 1 400℃ has been carried out. Results show that at below 1 000 °C , the coefficient of coarsening velocity- m of Ti (C, N) is less than 1 nm/s^1/3, at 1 400 °C that is 4 ~ 5 nm/s^1/3； with definite N content in steel and at definite temperature the coarsening velocity of Ti (C, N) increases with increasing Ti content, therefore with decreasing Ti content in steel is remarkably available for Ostwald-ripening of Ti (C, N), With definite Ti content in steel, at definite temperature the coarsening velocity of Ti (C,N) obviously decreases with increasing N content in steel, it shows that coarsening of Ti (C, N) particles in electric furnace steel are more difficult than that in converter steel.

Key words: Ti Microalloying Steel, Ti ( C, N), Ostwald Ripening

摘要： 对(%)0.2C、0.004～0.008N、0.02～0.05Ti微合金化钢中Ti(C, N)在850～1400℃的Ostwald熟化规律进行了理论计算。结果表明,1000℃以下碳氮化钛的粗化速率系数m小于1 nm/s^1/3,1400℃为4～5nm/s^1/3。钢中氮含量相同时,相同温度下碳氮化钛的粗化速率随钢中钛含量的增加而增大,因而降低钢中钛含量对碳氮化钛的熟化过程明显有利。而相同钛含量时,相同温度下碳氮化钛的粗化速率随钢中氮含量的增加而显著降低,这表明电炉钢中碳氮化钛颗粒比转炉钢更不容易发生粗化。

关键词: Ti微合金化钢, Ti(C,N), Ostwald熟化