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针对大板坯的输送过程,基于铸坯的传热模型建立热弹塑性模型,研究不同输送方式条件下铸坯热应力分布的变化规律。研究表明,在辊道输送过程中,铸坯表面和心部分别受拉应力和压应力作用,在铸坯宽度方向上,距边部约0.23m处拉应力最大,达到75 MPa,随着时间的延长,拉应力和压应力有减小趋势。在坑冷过程中,堆跺铸坯的中心区域和四周分别受压应力和拉应力作用,堆跺顶部和中心所受热应力的变化趋势都是先增大后减小。在堆冷过程中,堆冷铸坯顶部和中心处热应力分布及变化趋势与坑冷相似,但峰值更大,达到94 MPa。
In view of the conveying process of large slab, the thermo-elastic-plastic model was established based on the heat transfer model of slab, and the variation of thermal stress distribution under different conveying modes was studied. The results show that in the process of roller conveyor, the surface and core of the slab are subjected to tensile stress and compressive stress, respectively. The maximum tensile stress is about 0.23m from the edge in the width direction of slab, reaching 75 MPa, Of the extension, tensile stress and compressive stress have a decreasing trend. During the process of pit cooling, the stress and tensile stress were applied to the central region and the periphery of the pile slab respectively. The tendency of the thermal stress at the top and center of the pile was first increased and then decreased. During the stack cooling process, the distribution and trend of thermal stress at the top and center of the pile are similar to that of the pit cooling, but the peak value is larger, reaching 94 MPa.