论文部分内容阅读
目前密集冷却工艺已广泛用于生产高强度带钢,但是该技术冷却速率较快的特点易造成带钢冷却不均匀等问题,导致带钢残余应力过大,进而产生边浪等板形缺陷.本文利用有限元方法,使用ABAQUS有限元软件建立某700 MPa级高强度带钢在密集冷却工艺下的模型,实现温度-相变-应力耦合计算,并进行多个实验验证了模型的准确性.通过修改有限元模型边界条件和初始条件,研究边部遮挡和初始温差对带钢层流冷却阶段产生的残余应力分布的影响规律.对于减小带钢层流冷却过程中产生的残余应力,减小带钢进入层流冷却前的初始温差更加有效.本研究成果经过现场试验验证,可靠性较高,可用于指导该种类型高强带钢生产,以减少带钢的残余应力,提高带钢板形质量.
Currently intensive cooling process has been widely used in the production of high strength steel, but the cooling rate of the technology is more likely to lead to uneven cooling of the strip and other issues, leading to excessive residual stress in the strip, resulting in edge waves and other plate defects. In this paper, finite element method is used to establish the model of a 700 MPa high-strength strip under intensive cooling process using ABAQUS finite element software, and the temperature-phase transformation-stress coupling calculation is carried out. Several experiments verify the accuracy of the model. By modifying the boundary conditions and initial conditions of the finite element model, the influence law of the residual stress distribution during the cooling process of the laminar flow in the strip steel was studied by the influence of the edge obstruction and the initial temperature difference.To reduce the residual stress in the cooling process, The initial temperature difference before the strip enters the laminar flow cooling is more effective.The results of the research have been verified by on-site tests and have high reliability and can be used to guide the production of this type of high strength strip steel to reduce the residual stress of the strip steel and improve the strip shape quality.