摘要
建立热连轧过程中复合微合金钢碳氮化物析出的热力学模型,考虑碳氮化物和AlN的相互作用。针对该模型求解变量多、方程非线性、初始条件难确定等问题,采用耦合问题特征的牛顿拉夫森数值求解算法,确定不同成分下的碳氮化物和AlN的析出开始温度与析出顺序,获得奥氏体相中各元素平衡成分、碳氮化物析出成分及质量分数等随轧制温度的变化规律。对某轧钢厂生产的微合金钢进行仿真分析,模型计算结果符合冶金机理,对钢材组织性能进行有效的控制具有重要的指导意义。
A mathematical model for calculating the precipitation of carbonitride in the process of hot rolling of composite micro-alloyed steel is established, and the interaction between the carbonitride and AlN is considered. In view of the difficulties of the thermodynamic model that the variables are multiple,the equations are nonlinear and the boundary conditions are determined difficultly, the Newton-Raphson numerical algorithm characterized by coupled problem is adopted. The precipitation starting temperature and precipitation sequence of carbonitride and AlN at different compositions are determined. The equilibrium composition of elements in austenite, the composition and mass fraction of carbonitride precipitates, as well as other variation laws with the rolling temperature are obtained. The simulation and analysis are carried out based on the actual production data of a steel plant. The results show that the model is basically in accordance with the relevant metallurgical mechanism, which has an important guiding significance for the effective control of the microstructure and properties of steel.
作者
李维刚
杨威
刘超
严保康
Li Weigang;Yang Wei;Liu Chao;Yan Baokang(School of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Engineering Research Center for Metallurgical Automation and Measurement Technology of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《系统仿真学报》
CAS
CSCD
北大核心
2019年第3期520-527,共8页
Journal of System Simulation
基金
国家自然科学基金(51774219)
关键词
热轧
微合金钢
碳氮化物
析出
热力学模型
hot rolling
micro-alloyed steel
carbonitride
precipitation
thermodynamic model
