论文部分内容阅读
以微合金元素的析出热力学和析出动力学为基础,针对Fe-Nb-V-Ti-Al-C-N合金系,定量计算了热连轧过程中(Nb,V,Ti)(C,N)和AlN在奥氏体中的析出行为,并进一步分析了热轧制温度对析出行为的影响。计算结果表明,对所研究的钢种成分和工艺条件,在加热过程中(Nb,V,Ti)(C,N)就已经析出,在粗轧阶段,(Nb,V,Ti)(C,N)析出粒子平均半径逐渐减小,在精轧阶段,(Nb,V,Ti)(C,N)基本达到平衡析出量,终轧后析出粒子平均半径保持在23 nm左右。轧制时的热变形增大了形核率,促进了析出,使析出粒子的平均半径减小。随加热和轧制温度的降低,(Nb,V,Ti)(C,N)的析出量有所增加,粒子平均半径减小。
Based on the precipitation thermodynamics and precipitation kinetics of microalloying elements, the (Nb, V, Ti) (C, N) and AlN precipitation behavior in austenite, and further analysis of hot rolling temperature on the precipitation behavior. The results show that (Nb, V, Ti) (C, N) have been precipitated during the heating process for the composition and processing conditions of the steel. In the rough rolling stage, (Nb, V, Ti) (C, N) reaches the equilibrium precipitation rate. The average radius of the precipitated particles after the final rolling is maintained at about 23 nm. Hot deformation during rolling increases the rate of nucleation and promotes precipitation, reducing the average radius of precipitated particles. With the decrease of heating temperature and rolling temperature, the amount of (Nb, V, Ti) (C, N) precipitates increases and the average radius of particles decreases.