热连轧过程复合微合金碳氮化物析出的定量计算  

Quantitative calculation on precipitation behavior of complex microalloyed carbonitride during hot rolling

作　　者：彭宁琦[1] 唐广波[1] 刘正东[1] 雍岐龙[1] 

机构地区：[1]钢铁研究总院结构材料研究所,北京100081

出　　处：《材料热处理学报》2011年第6期155-161,共7页Transactions of Materials and Heat Treatment

基　　金：国家"十一五"科技支撑计划资助项目(2006BAE03A08和2006BAE03A04)

摘　　要：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。Precipitation behavior of complex microalloyed carbonitride,（Nb,V,Ti）（C,N）,and AlN in austenite in Fe-Nb-V-Ti-Al-C-N system during hot rolling were quantitatively calculated on the basis of precipitation thermodynamics and kinetics,and the influence of the hot deformation temperature on the precipitation behaviors was analyzed.The results indicate that the precipitation of（Nb,V,Ti）（C,N） has already started during reheating for the investigated steel composition and processing conditions.The mean radius of precipitated（Nb,V,Ti）（C,N） particles decreases gradually during rough rolling,while the precipitation of（Nb,V,Ti）（C,N） has almost reached the equilibrium state during finish rolling.After finish rolling the mean radius of（Nb,V,Ti）（C,N） particles is about 23 nm.Hot deformation can increase nucleation rate and promote precipitation process,so as to decrease the radius of precipitated particles.With the increasing of reheating temperature and rolling temperature,the volume fraction of precipitated（Nb,V,Ti）（C,N） increases while the average particle radius decreases.

关 键 词：微合金钢 碳氮化物 析出 热力学 动力学 

分 类 号：TG142.13[一般工业技术—材料科学与工程]