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基于物理冶金理论,研究了热轧带钢过程中的奥氏体晶粒长大模型、奥氏体再结晶模型、奥氏体相变模型以及力学性能模型。奥氏体再结晶模型中,通过研究位错密度的变化来描述由于再结晶不完全造成的变形抗力的变化。奥氏体相变模型中,通过碳扩散理论描述了奥氏体-铁素体相界面随冷却过程的变化规律。基于热轧带钢过程中的冶金物理模型,开发热轧带钢组织性能预报系统。系统包括4个模块,分别用于计算板坯在加热炉、粗轧精轧、层流冷却和卷取完成各阶段的组织和力学性能参数,生产工艺是该系统的重要输入参数。利用该系统对某钢厂实际生产过程的组织性能进行预报,预报的力学性能和现场实测值有较好的一致性。
Based on the theory of physical metallurgy, the austenite grain growth model, austenite recrystallization model, austenite transformation model and the mechanical property model of hot rolled strip were studied. In the austenite recrystallization model, the change in deformation resistance due to incomplete recrystallization is described by studying the change in dislocation density. In the austenite transformation model, the variation of austenite-ferrite interface with the cooling process was described by carbon diffusion theory. Based on the metallurgical physical model in the process of hot strip rolling, the microstructure and property prediction system of hot rolled strip is developed. The system consists of four modules, which are used to calculate the microstructure and mechanical properties of the slab in the furnace, finish rolling, laminar cooling and coiling respectively. The production process is an important input parameter of the system. Using this system to predict the actual performance of a steel mill, the predicted mechanical properties are in good agreement with the actual measured values.