Constitutive Modeling of the Flow Stress of GCr15 Continuous Casting Bloom in the Heavy Reduction Process

Ji, Cheng; Wang, Zilin; Wu, Chenhui; Zhu, Miaoyong

doi:10.1007/s11663-018-1188-9

Cited by 28 publications

(21 citation statements)

References 35 publications

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“…Based on the temperature distribution at the strand solidification end predicted by this 2D heat transfer model, the slab initial temperature field in the 3D thermal-mechanical coupled model could be determined with the interpolation method. The Arrhenius-type constitutive equations, derived based on the measured true stress-strain curves under conditions of different strain rates and temperatures in the present authors' previous work, [20,21] as shown in Figure 4, were applied to the 3D thermal-mechanical coupled model as material properties to accurately describe the metal flow behavior of the casting slab during HR, which can be expressed as:…”

Section: Simulation Parametersmentioning

confidence: 99%

“…By conducting industrial experiments, Cheng et al [19] compared the difference between single-roll and multiroll reduction modes during HR for alleviating porosity in billets, and the porosity closure behavior was simulated with a 3D FEM to further clarify the difference between these two reduction modes. The present authors presented a two-stage sequential HR technology, [15] and the flow stress, [20,21] deformation, [22][23][24] macrosegregation, [25] and recrystallization [26] of continuous casting slab or bloom with HR was investigated systematically.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of Microporosities in Wide‐Thick Continuous Casting Slab during Heavy Reduction Process

Zhang

Wu²,

et al. 2022

steel research int.

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Heavy reduction (HR) is an effective process that can significantly minimize the internal porosity and other internal defects in continuous casting steel. Herein, samples taken from different wide‐thick slab positions are examined by scanning acoustic microscopy and 3D reconstructed. The morphology and distribution of microporosities <1 mm in size in the wide‐thick slab are revealed. The microporosities are mainly distributed in a stripping zone symmetric about the centerline within a 1/3‐slab thickness, and most have a considerably obvious long‐ and short‐axis tendency, which can be approximated as ellipsoids. The microporosity evolution in the wide‐thick slab during HR at the solidification end is numerically investigated with a 3D thermal–mechanical coupled model. The microporosity evolution in an aggregated distribution region during HR is little influenced by the surrounding microporosities. With increasing slab centerline‐microporosity distance, the microporosity minimization effect of HR becomes poor. When the axial ratio (long axis/short axis) is 1.43, the microporosity closure is the largest, and the porosity closure is the highest when the long axis is perpendicular to the reduction direction. When the total segment reduction is constant, the reduction mode with gradually decreasing reduction results in the highest total porosity closure and minimum reduction force.

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Section: Simulation Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution of Microporosities in Wide‐Thick Continuous Casting Slab during Heavy Reduction Process

Zhang

Wu²,

et al. 2022

steel research int.

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“…To accurately describe the deformation behavior of the GCr15 bloom between the reduction rolls and bloom surface, the properties of steel material have been taken from our previous work, 11,17 such as density, thermal conductivity, specific heat capacity and thermal expansion coefficient. In addition, an Arrhenius-type constitutive equation of high carbon steel 11,17,18 has been adopted in the 3D thermalmechanical coupled model. With this model, the effect of differential reduction amount of the first and the end reduction rolls on evolution of stress and displacement in as-cast bloom was systematically investigated under different process parameters.…”

Section: Development Of Mechanical Soft Reduction Modelmentioning

confidence: 99%

Influence of differential reduction rate in adjacent roll reduction zone on internal cracks of high carbon bloom induced by mechanical soft reduction

Zong

Sun

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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To comprehensively investigate and alleviate internal cracks in high carbon bloom induced by mechanical soft reduction (MSR), a 3D thermal-mechanical coupled model, containing two adjacent pairs of reduction rolls, was developed to investigate the influence of differential reduction rate on evolution of stress concentration and displacement in as-cast bloom. In order to effectively provide theoretical basis for actual production, the reduction rate was calculated according to the appropriate reduction amount of each pair of reduction rolls, which can be adopted in the MSR to determinate the appropriate roll reduction amount in adjacent roll reduction zone. With the differential reduction rate of MSR increasing from −2.67 mm/m to 5.33 mm/m, the maximum equivalent stress of cracking area in as-cast bloom significantly decreased under first roll reduction position, the maximal displacement along the bloom width direction is significantly decreased with increasing of the differential reduction rate of MSR under end roll reduction position. According to the results of industrial experiment, the internal cracks were effectively alleviated and center shrinkage cavities were nearly eliminated by optimum designed experiments.

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“…In order to accurately describe the metal flow behavior of the wide-thick slab during HR, the true stress-strain of the studied steel grade was measured at different temperatures and strain rates, and the measured results are presented in Figure 5. Based on the measured results in Figure 5, an Arrhenius-type constitutive model was derived with the similar method adopted in our previous work for establishing an Arrhenius-type constitutive model of GCr15 steel [35]. The derived constitutive model of the studied steel was then applied to the 3D thermal-mechanical coupled model, and the strain and stress in the constitutive model were adopted as equivalent strain and equivalent stress in the 3D thermal-mechanical coupled model.…”

Section: D Thermal-mechanical Coupled Modelmentioning

confidence: 99%

“…In order to show the accuracy of the derived Arrhenius-type constitutive model, flow stress under different temperature and strain rates was calculated with this constitutive model, and the calculated results are compared with the measured ones in Figure 6. Based on the measured and the calculated results in Figure 6, the standard statistical parameters of average absolute relative error (AARE) for the measured and the calculated values, which has been adopted in our previous work [35], was calculated with Equation (5). It is found that the value of AARE is about 4.7%, which proves the accuracy of the derived constitutive model.…”

Section: Model Validationmentioning

confidence: 99%

Deformation Behavior of Internal Porosity in Continuous Casting Wide-Thick Slab during Heavy Reduction

Zhu

2019

Metals

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Heavy reduction (HR) is a novel technology that could effectively improve the internal porosities and other internal quality problems in continuously cast steel, during which a large reduction deformation is implemented at and after the strand solidification end. In the present paper, non-uniform solidification of the wide-thick slab was calculated with a two-dimensional (2D) heat transfer model. Based on the predicted temperature distribution at the solidification end of the casting strand, a three-dimensional (3D) thermal-mechanical coupled model was developed for investigating the deformation behavior of the internal porosities in wide-thick slab during HR. An Arrhenius-type constitutive model for the studied steel grade was derived based on the measured true stress-strain with single-pass thermosimulation compression experiments and applied to the 3D thermal-mechanical coupled model for improving the calculation accuracy. With the developed 3D thermal-mechanical coupled model, deformation behavior of the two artificial porosities located at the slab center of 1/2 width and 1/8 width during HR was investigated under different condition of HR deformation, HR start position, and HR reduction mode. Based on the calculated porosity closure degree (ηs) and the corresponding equivalent strain (εeq) under different HR conditions, a prediction model that describes the quantitative relationship between ηs and εeq was derived for directly and accurately evaluating the process effect of HR on improving the internal porosities in wide-thick slab.

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Constitutive Modeling of the Flow Stress of GCr15 Continuous Casting Bloom in the Heavy Reduction Process

Cited by 28 publications

References 35 publications

Evolution of Microporosities in Wide‐Thick Continuous Casting Slab during Heavy Reduction Process

Evolution of Microporosities in Wide‐Thick Continuous Casting Slab during Heavy Reduction Process

Influence of differential reduction rate in adjacent roll reduction zone on internal cracks of high carbon bloom induced by mechanical soft reduction

Deformation Behavior of Internal Porosity in Continuous Casting Wide-Thick Slab during Heavy Reduction

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