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针对热轧带钢16Mn轧后层流冷却过程,建立了温度与相变耦合计算的有限元模型,分析了冷却过程中带钢内应力的变化规律。结果表明,对于厚度为3.0mm的带钢经过层流冷却后沿带钢厚度方向温度趋于一致,沿宽度方向温差进一步增大。在不考虑初始应力的状态下,层流冷却结束后,带钢中部为18MPa的轧向拉应力,边部为-187MPa的轧向压应力。带钢边部存在的温度梯度和相变行为的差异是带钢在冷却过程中产生残余应力的主要原因,这种残余应力状态最终会导致带钢产生边浪。
Aiming at the cooling process of the hot strip 16Mn after rolling, the finite element model of temperature and phase transition coupling was established, and the variation of internal stress in strip during cooling process was analyzed. The results show that for the strip with thickness of 3.0mm, the temperature in the thickness direction of the strip tends to be the same after laminar cooling, and the temperature difference in the width direction is further increased. Without considering the initial stress, after the laminar cooling was completed, the middle of the strip had a tensile stress of 18 MPa in the rolling direction and a rolling stress of -187 MPa in the periphery. The difference between the temperature gradient and the phase transition behavior of the strip edges is the main reason for the residual stress in the strip during the cooling process. This residual stress state will eventually lead to edge waves in the strip.