{"title":"Study on the control of post-roll bending deformation and residual stress in hot-rolled L-beam based on rapid cooling","authors":"Jie Li, Xianming Zhao","doi":"10.1177/14644207241269622","DOIUrl":null,"url":null,"abstract":"The bending deformation problem and internal residual stress of hot-rolled L-beams affect the quality and subsequent use performance of L-beams. In this paper, the computational model of the L-beam air-cooling process is established by using ABAQUS finite element software, which reveals the reasons for three times deformation of the L-beam from the perspectives of phase change expansion and metal cooling contraction. In order to control the deformation and residual stress of the L-beam, four experimental schemes were determined with the cooling method, water pressure, and the opening and closing state of the cooling unit of the cooler as variables. The temperature distribution, deformation before straightening, warping deformation after cutting, and magnetic field distribution curves of L-beams before and after rapid cooling under different experimental schemes were examined, and the microstructure and properties of L-beams were examined and the results were analyzed. The results show that the cooling uniformity of the L-beam can be improved by rapid cooling, which can effectively reduce the amount of bending per meter of the L-beam before straightening, the amount of warping deformation after cutting, and reduce the level of residual stress inside the L-beam, and at the same time can refine the microstructure and improve the properties. In this study, the amount of bending per meter and warpage deformation after cutting of L-beams were reduced by up to 67.3% and 85.7%, respectively, and the maximum value of the magnetic field gradient associated with the stresses in the L-beams was reduced by up to 80.2%.","PeriodicalId":20630,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications","volume":"8 1","pages":""},"PeriodicalIF":2.5000,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1177/14644207241269622","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The bending deformation problem and internal residual stress of hot-rolled L-beams affect the quality and subsequent use performance of L-beams. In this paper, the computational model of the L-beam air-cooling process is established by using ABAQUS finite element software, which reveals the reasons for three times deformation of the L-beam from the perspectives of phase change expansion and metal cooling contraction. In order to control the deformation and residual stress of the L-beam, four experimental schemes were determined with the cooling method, water pressure, and the opening and closing state of the cooling unit of the cooler as variables. The temperature distribution, deformation before straightening, warping deformation after cutting, and magnetic field distribution curves of L-beams before and after rapid cooling under different experimental schemes were examined, and the microstructure and properties of L-beams were examined and the results were analyzed. The results show that the cooling uniformity of the L-beam can be improved by rapid cooling, which can effectively reduce the amount of bending per meter of the L-beam before straightening, the amount of warping deformation after cutting, and reduce the level of residual stress inside the L-beam, and at the same time can refine the microstructure and improve the properties. In this study, the amount of bending per meter and warpage deformation after cutting of L-beams were reduced by up to 67.3% and 85.7%, respectively, and the maximum value of the magnetic field gradient associated with the stresses in the L-beams was reduced by up to 80.2%.
热轧 L 型钢的弯曲变形问题和内部残余应力影响着 L 型钢的质量和后续使用性能。本文利用 ABAQUS 有限元软件建立了 L 型钢空冷过程的计算模型,从相变膨胀和金属冷却收缩的角度揭示了 L 型钢三次变形的原因。为了控制 L 型钢的变形和残余应力,以冷却方式、水压和冷却器冷却单元的开闭状态为变量,确定了四种实验方案。考察了不同实验方案下 L 型钢快速冷却前后的温度分布、矫直前变形、切割后翘曲变形和磁场分布曲线,检验了 L 型钢的微观结构和性能,并对结果进行了分析。结果表明,通过快速冷却可以改善 L 型钢的冷却均匀性,从而有效减少 L 型钢矫直前的每米弯曲量和切割后的翘曲变形量,降低 L 型钢内部的残余应力水平,同时还能细化微观结构和改善性能。在这项研究中,L 型钢的每米弯曲量和切割后的翘曲变形量分别减少了 67.3% 和 85.7%,与 L 型钢应力相关的磁场梯度最大值减少了 80.2%。
期刊介绍:
The Journal of Materials: Design and Applications covers the usage and design of materials for application in an engineering context. The materials covered include metals, ceramics, and composites, as well as engineering polymers.
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