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Residual stress reduction of low alloy high strength steel strip based on finite element analysis

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Document pages: 13 pages

Abstract: Enhanced cooling technology is widely used in the production of high strength hot rolled strip. However, enhanced cooling at high cooling rate may lead to uneven stress on the strip, resulting in huge residual stress and affecting the shape of the strip. In this study, a three-dimensional finite element (FE) model of high-strength low-alloy steel strip on the deviation table is developed by using ABAQUS software, which couples heat transfer, phase transformation and strain stress. In order to improve the modeling accuracy, a number of experiments were carried out, such as uniaxial tensile test at multiple temperatures, dynamic continuous cooling transformation and scanning electron microscope, to determine the material properties and boundary conditions of the finite element model. Four new models ae established based on this model to reduce the residual stress of strip by modifying the initial and boundary conditions. Results show that reducing the initial transverse temperature difference is the most effective in reducing residual stress, followed by sparse cooling, edge masking, and posterior cooling.

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