Calculation of thermal stress affecting strip flatness change during run-out table cooling in hot steel strip rolling

Wang, Xiaodong; Yang, Quan; He, Anrui

doi:10.1016/j.jmatprotec.2007.12.076

Cited by 46 publications

(20 citation statements)

References 21 publications

(29 reference statements)

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“…Results showed that temperature distribution has the largest impact on the deformation of a strip. Wang et al [9] established a FE model to analyze the thermal stresses during the cooling of hot-rolled strip on the ROT using the ABAQUS FE program. e results demonstrated that temperature drop within the strip edge region resulted in the development of edge waviness.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Residual Stress for High‐Strength Low‐Alloy Steel Strip Based on Finite Element Analysis

Qiu

Shao

et al. 2018

Advances in Materials Science and Engineering

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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.

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Section: Introductionmentioning

confidence: 99%

Reduction of Residual Stress for High‐Strength Low‐Alloy Steel Strip Based on Finite Element Analysis

Qiu

Shao

et al. 2018

Advances in Materials Science and Engineering

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“…The coefficient of friction is extracted from tests. Therefore, the produced heat by the friction can be calculated by [14] …”

Section: Mechanical Boundary Conditionsmentioning

confidence: 99%

Inhomogeneity of temperature distribution through thickness of the aluminium strip during hot rolling

Ashtiani

Bisadi

Parsa

2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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Temperature distribution and inhomogeneity of its through thickness of the strip play an essential role in hot rolling processes, where both the strip and work-roll behaviour are affected strongly by these temperature fields and the microstructural and mechanical properties through thickness of hot rolled strip depend on this temperature inhomogeneity within the strip being deformed during hot rolling. In this investigation, a mathematical model was developed to predict the thermal history and inhomogeneity of temperature through thickness of an aluminium alloy strip undergoing single-stand hot plate rolling using the commercial finite element (FE) package, ABAQUS/Explicit in three dimensions. To estimate the reliability of the numerical analysis, the FE model was validated using experimental roll force and torque data and also temperature history at the centre-line of strip; good agreement was found between the two sets of predicated and experimental results. The effects of various process parameters, such as rolling speed, interface heat-transfer and friction coefficients between strip and work roll, initial thickness of the strip, and work-roll temperature and diameter on the temperature inhomogeneity, is considered.

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“…Therefore, numerical simulations are needed to understand and quantify all mechanisms involved in the different processes. Thus, significant efforts have been made for the simulation of the rolling process [1,2], the run out table [3][4][5] and the coiling process [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Classic couplings between heat conduction, phase transition and mechanics are presented in figure 2. Thus, most estimations of residual stresses [17,18,[3][4][5] relies on highly coupled computations even though some couplings are neglected, for instance the effect of strain and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 stress on thermal and phase transition problems (dotted lines in figure 2). Despite the fact that the cited works present different degrees of details, the most common numerical strategy consists in developing a user material (UMAT) in the Finite Element software Abaqus [19] in order to solve simultaneously the heat conduction problem, phase transitions (via Avrami's equation) and the mechanical problem.…”

Section: Introductionmentioning

confidence: 99%

Residual stress on the run out table accounting for multiphase transitions and transformation induced plasticity

Weisz-Patrault

Koedinger

2018

Applied Mathematical Modelling

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The development of harder and thinner new steel grades necessitates reasonably fast numerical simulations of forming processes in order to optimize industrial conditions through parametric studies. This paper focuses on the evolution of residual stresses of thin strips during cooling on the run out table. Since the problem involves multiphysics and non-linear processes, comprehensive and fully coupled numerical approaches may be difficult to use to design or optimize industrial conditions because of extensive computation times. Therefore, a simplified numerical simulation has been developed and consists in solving first the thermal problem coupled with multiphase transitions and then the mechanical problem accounting for thermal expansion, metallurgical deformation and transformation induced plasticity. Residual stress profiles through the strip thickness are also computed in order to evaluate classic flatness defects such as crossbow and longbow. A postprocessing is also included in order to quantify out of plane displacements that would take place if the strip were cut off the production line. It consists in computing at finite strain the relaxation of residual stresses when the tension applied by the coiler is released. The proposed numerical strategy has been tested on common industrial conditions. Highlights• Numerical strategy to simulate a non-linear and multiphysics problem: the cooling of a steel strip on the run out table.• Heat conduction strongly coupled with metallurgical transformations and an elastic-plastic calculation of residual stress evolution.• Thermal expansion, density mismatch between phases and transformation induced plasticity modeled as eigenstrain.• Significant decrease of the initial residual stress profile, but the asymmetry is responsible for bending moments• Flatness defects such as longbow and crossbow are detected.Preprint submitted to Applied Mathematical Modelling September 3, 2017 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Residual stress on the run out *Highlights AbstractThe development of harder and thinner new steel grades necessitates reasonably fast numerical simulations of forming processes in order to optimize industrial conditions through parametric studies. This paper focuses on the evolution of residual stresses of thin strips during cooling on the run out table. Since the problem involves multiphysics and non-linear processes, comprehensive and fully coupled numerical approaches may be difficult to use to design or optimize industrial conditions because of extensive computation times. Therefore, a simplified numerical simulation has been developed and consists in solving first the thermal problem coupled with multiphase transitions and then the mechanical problem accounting for thermal expansion, metallurgical deformation and transformation induced ...

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Calculation of thermal stress affecting strip flatness change during run-out table cooling in hot steel strip rolling

Cited by 46 publications

References 21 publications

Reduction of Residual Stress for High‐Strength Low‐Alloy Steel Strip Based on Finite Element Analysis

Reduction of Residual Stress for High‐Strength Low‐Alloy Steel Strip Based on Finite Element Analysis

Inhomogeneity of temperature distribution through thickness of the aluminium strip during hot rolling

Residual stress on the run out table accounting for multiphase transitions and transformation induced plasticity

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