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高强钢板在进入层流冷却前,因其宽度方向上的中部和边部初始温差过大,导致层流冷却后钢板出现双边浪缺陷。针对此问题,通过试验测量不同初始温差钢板层流冷却后长度方向的残余应力,以测量的残余应力作为边界条件,建立了钢板稳定性分析模型,运用解析方法求解出钢板屈曲失稳的临界残余应力。将试验测量的残余应力最大值和初始温差进行拟合,根据钢板屈曲失稳的临界残余应力求出临界初始温差约为40℃,这对高强钢板的生产有切实的指导作用。
Before entering the laminar flow cooling, the initial temperature difference between the middle and the edge of the high-strength steel sheet is too large, resulting in double-sided wave defects in the steel plate after the laminar cooling. In order to solve the problem, the residual stress in the longitudinal direction after laminar flow cooling of different initial temperature difference was measured by experiment, the stability analysis model of the steel plate was established by using the measured residual stress as the boundary condition, and the critical residual of buckling instability of the steel plate was solved by analytical method stress. According to the critical residual stress of buckling instability of steel plate, the critical initial temperature difference is about 40 ℃, which has a practical guidance for the production of high strength steel plate.