Abstract
Intensive cooling technology is widely utilized in the production of high-strength hot-rolled steel strip. However, intensive cooling at high cooling rate may cause stress heterogeneity on a steel strip, which further generates great residual stress and influences steel strip shape. In this study, a three-dimensional finite element (FE) model of high-strength low-alloy steel strip on the run-out table coupled with heat transfer, phase transformation, and strain/stress is developed by ABAQUS software. To enhance modeling precision, several experiments are conducted, such as uniaxial tensile test at multiple temperatures, dynamic continuous cooling transformation, and scanning electron microscopy, to determine the material properties and boundary conditions of the FE model. Four new models are 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.
Highlights
IntroductionWith the development of the iron-steel industry technology, fine-grain strengthening mechanism is extensively applied in the production of a hot-rolled steel strip
With the development of the iron-steel industry technology, fine-grain strengthening mechanism is extensively applied in the production of a hot-rolled steel strip. is approach can improve the bending strength and toughness of the steel [1].e traditional method to refine grains is doping alloying elements, such as Ti and Nb, increasing production cost [2]
By comparing the results of the finite element (FE) model and measurement, it can be found that the distribution and value of the results are almost consistent, and the temperature in the central strip is higher than the temperature on both edges
Summary
With the development of the iron-steel industry technology, fine-grain strengthening mechanism is extensively applied in the production of a hot-rolled steel strip. E traditional method to refine grains is doping alloying elements, such as Ti and Nb, increasing production cost [2]. Accelerated cooling technology has been widely applied in recent years. Two modes can be applied to achieve high cooling rate: by increasing the density of cooling nozzles or by increasing cooling water pressure. Is condition decreases the size of austenite grains, whereas the ferrite grains are refined despite the little consumption of alloying elements [3, 4]. Residual stress is generated by nonuniform cooling, which influences the shape of the strips. The shape of high-strength steel strips is more difficult to correct after cooling to room temperature than that of low-strength steels
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