论文部分内容阅读
通过建立12 mm厚度X70钢层流冷却过程中的热-力-相变耦合模型,研究了温度、组织、应力和应变的不均匀分布规律,采取三种工艺措施研究改善不均匀冷却的效果,并对计算的温度和组织场进行了试验验证。结果表明:在整个轧后层流冷却过程中,带钢宽度方向上的温度分布都是不均匀的,在卷取时刻中部和边部的温度差值为53.4℃,贝氏体含量差值为36.2%;均匀的初始温度和后区冷却工艺对改善温度、组织分布不均效果差于边部遮蔽方式,但后区冷却工艺可以减小带钢边部的残余塑性应变值;合理的边部遮蔽宽度可以显著改善带钢宽度方向上的温度、组织和残余应力的分布不均,消除边部的塑性变形。
Through the establishment of the coupled thermo-mechanical-thermal model during the laminar flow cooling of 12 mm thick X70 steel, the uneven distribution of temperature, microstructure, stress and strain was studied, and three kinds of technological measures were taken to study the effect of improving the uneven cooling. The calculated temperature and texture field have been verified by experiments. The results show that the temperature distribution in the strip width direction is not uniform during the entire laminar cooling. The temperature difference between the middle part and the edge part is 53.4 ℃ during the coiling, the difference of the bainite content is 36.2%. The uniform initial temperature and the cooling zone in the back zone have less effect on improving the temperature and the uneven distribution of the tissue than the side shadowing mode, but the cooling zone in the back zone can reduce the residual plastic strain at the edge of the strip. Shading width can significantly improve the temperature in the strip width direction, uneven distribution of tissue and residual stress, to eliminate the plastic deformation of the edge.