基于有限元和试验的热轧带钢残余应力减量化

Residual stress reduction of hot rolling strip based on finite element method and experiment

研究残余应力减量化技术可提高热轧带钢板形质量。有限元技术及相应的试验验证已广泛应用于工业生产,采用该方法对带钢层流冷却过程中的温度、相变及应力耦合进行求解,对于分析带钢轧后冷却不均、应力应变不均及翘曲具有重要意义。基于ABAQUS建立热轧带钢在密集冷却工艺条件下的有限元模型,实现温度、相变和应力三者的耦合计算,并进行温度测试、材料微观组织测试及应力测试等多个试验验证。计算结果表明,减小带钢进入层流冷却前的初始温差、采用边部遮挡技术对减少带钢残余应力均具有积极的意义。通过一个改善初始温差分布进而改善带钢残余应力的实例,验证了提出的方法和结论的正确性。

Study on residual stress reduction can improve strip shape quality. Finite element method and the corresponding experimental verification have been widely used in industrial production. Research on temperature and stress coupled model based on finite element and experimental verification in the process of hot rolling laminar cooling is of positive significance for solving strip uneven transverse cooling,uneven stress and buckling. By using ABAQUS finite element method,temperature and stress coupled model of laminar cooling on hot strip mill is established,and the coupling calculation of temperature,phase transformation and stress is realized. Temperature test,material microstructure test and stress test are used for model validation. The result shows that the initial temperature difference in strip transverse direction and the edge masking are significant to reduce residual stress. In this paper,an example is given to reduce the strip residual stress by improving the distribution of initial temperature difference,and the correctness of the proposed method and the conclusion is verified.