HSLA钢控轧过程温度、组织及形变抗力预测模型研究

Research on the Prediction Models of Temperature,Microstructure and Flow Stress during the Controlled Rolling of HSLA Steel

以低碳微合金钢(HSLA)控制轧制过程为对象,建立了该过程中板坯内部的温度、组织和形变抗力的预测模型。控制轧制过程中,板坯内部的温度变化一般采用一维或二维非稳态导热微分方程进行求解;板坯的形变抗力可采用双指数模型进行预测;而板坯内部的晶粒尺度主要由轧制、再结晶以及晶粒长大过程来控制。本研究为HSLA钢控制轧制和控制冷却过程中板坯的组织、力学性能和轧辊轧制载荷的预测奠定基础。

The prediction models of temperature,microstructure and flow stress during the controlled rolling of HSLA steel are promoted in this study.During the rolling process,the temperature of the slab can be described by the 1-D or 2-D unsteady heat conduction differential equa-tion.Double exponential equation is suitable for calculating the variation of flow stress of the HSLA steel during rolling process.Recrystalliza-tion and grain growth are considered as the main control mechanisms of the microstructure variation,and the mathematical model of the evolu-tion of microstructure of HSLA steel during controlled rolling are established.The results of the study provide a theoretical basis for the predic-tion of temperature,microstructure and flow stess of the HSLA steel during the controlled rolling process.