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带钢内部纵向残余应力沿宽度分布不均会造成平坦度缺陷，严重影响带钢的板形质量.在传统的残余应力解析计算方法中，大都忽略金属横向流动的作用.为了解决这一问题，采用有限元方法，基于某1 780 mm热轧生产线，建立了三维弹塑性有限元计算模型，充分考虑金属横向流动对残余应力的影响，探究了残余应力在机架间的演变以及不同比例凸度变化下带钢的残余应力状态.结果表明：残余应力在机架间发生反转；金属横向流动会减小纵向应变差，从而达到减小纵向残余压应力的目的，当比例凸度增加至0.5%～1.15%时，残余压应力最小.
Abstract：The inhomogeneous distribution of longitudinal residual stress along the width in strip steel could cause flatness defects and seriously affect the strip shape quality. In the traditional analytical methods of residual stress, the effect of lateral metal flow is usually neglected. In order to solve this problem, based on a 1 780 mm hot rolling line, a three-dimensional elastic-plastic finite element calculation model has been established in this paper. The effect of lateral metal flow on residual stress is fully considered. The evolution of residual stress between stands and the residual stress state of strip steel with different proportions of unit crown variation has been investigated. It is found that residual stress reverses between stands. Secondly, it is found that the lateral metal flow reduces the longitudinal strain difference and the longitudinal residual compressive stress, which can be minimized when the unit crown increases to 0.5%～1.15%.
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基本信息:
DOI：10.14186/j.cnki.1671-6620.2024.02.011
中图分类号:TG335.56
引用信息:
[1]李梦琴,吴豪,田佾鑫,等.带钢热轧过程中残余应力的数值模拟[J].材料与冶金学报,2024,23(02):197-204.DOI:10.14186/j.cnki.1671-6620.2024.02.011.
基金信息:
国家重点研发计划项目(2022YFB3304800); 国家自然科学基金重点项目(U21A20117,52074085); 辽宁省“兴辽英才”计划项目(XLYC1907065); 中央高校基本科研业务费项目(N2004010)