Thermo-Mechanical Behavior of the Continuous Casting Bloom in the Heavy Reduction Process

Ji, Cheng; Wu, Chenhui; Zhu, Miaoyong

doi:10.1007/s11837-016-2041-8

Cited by 54 publications

(30 citation statements)

References 21 publications

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“…When accurate pyrometer measurements are available, an inverse model can be applied to match the predicted surface temperature profile with the peaks of those measurements, to overcome dips caused by intermittent scale . Finally, the shell thickness predictions near final solidification of several models have been successfully validated with nail shooting measurements …”

Section: Heat Transfer and Solidificationmentioning

confidence: 99%

“…[12] Finally, the shell thickness predictions near final solidification of several models have been successfully validated with nail shooting measurements. [12,[25][26][27][28] Once validated, simple heat transfer solidification models have a wide range of powerful practical applications, which have had great impact on improving the process in commercial practice. For example, post-mortem analysis of the location and cause of internal hot-tear cracks can be inferred from model predictions of the location of the critical temperature range near the solidification front.…”

Section: Heat Transfer and Solidificationmentioning

confidence: 99%

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Review on Modeling and Simulation of Continuous Casting

Thomas

2017

steel research int.

183

115

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Continuous casting is a mature, sophisticated technological process, used to produce most of the world's steel, so is worthy of fundamentally-based computational modeling. It involves many interacting phenomena including heat transfer, solidification, multiphase turbulent flow, clogging, electromagnetic effects, complex interfacial behavior, particle entrapment, thermal-mechanical distortion, stress, cracks, segregation, and microstructure formation. Furthermore, these phenomena are transient, three-dimensional, and operate over wide length and time scales. This paper reviews the current state of the art in modeling these phenomena, focusing on practical applications to the formation of defects. It emphasizes model verification and validation of model predictions. The models reviewed range from fast and simple for implementation into online model-based control systems to sophisticated multiphysics simulations that incorporate many coupled phenomena. Both the accomplishments and remaining challenges are discussed.

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Section: Heat Transfer and Solidificationmentioning

confidence: 99%

Section: Heat Transfer and Solidificationmentioning

confidence: 99%

Review on Modeling and Simulation of Continuous Casting

Thomas

2017

steel research int.

183

115

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“…A HR technology called "PosHARP" was also developed by POSCO to eliminate internal defects of the slab. Recently, a similar two-stage sequential HR method has been presented by Ji et al [14], in which the reductions are conducted both before and after the solidification end to improve the homogeneity and compactness of the bloom, respectively. For these HR technologies, the deformation temperature of the core metal is in the brittleness temperature range [15,16]; thus, the internal are cracks easily formed in those HR processes discussed above.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Dynamic Recrystallization of Casting Slabs during Hot-Core Heavy Reduction Rolling Process

Gong

et al. 2020

Metals

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Hot-core heavy reduction rolling (HHR2) is an innovative technology, where a two-high rolling mill is installed after the solidification end of a strand, which can significantly eliminate the core defects of the slab. The mill exhibits a heavy reduction ratio, which promotes the dynamic recrystallization (DRX) of the slab. This study aims to optimize the parameters of the HHR2 process considering the effect of DRX on microstructure homogeneity. The secondary development of commercial software DEFORM-3D is conducted to calculate the deformation and DRX behavior of HHR2 for different reduction ratios. The parameters of DRX volume fraction and DRX grain size are compared, and finer DRX grains are obtained when the greater reduction ratios are conducted in HHR2. Then, corresponding to the deformation conditions in the HHR2, the thermal–mechanical simulations are conducted on the Gleeble3800 to obtain the average grain sizes before and after this process. When the reduction amount increases from 20 mm to 50 mm, the difference of average grain size between the core and the surface reduces by 52%. In other words, appropriately enhancing the reduction ratio is helpful to reduce the average austenite grain and promote the microstructure uniformity of the slab. These results provide some valuable information on the design of deformation parameters for HHR2.

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“…As an effective counter measure of internal defects in continuous casting steel, HR has attracted more and more researchers' attention with the rapidly increased demand for large components in the large equipment manufacturing industry in recent years. Some theoretical and experimental investigations were carried out recently for studying the improving effect of HR on porosity and other internal defects in continuous casting bloom [28,29], billet [30], or slab [19][20][21], and some new HR technologies were then proposed and applied. By establishing a three-dimensional (3D) thermal-mechanical coupled model, the present authors [28] studied the deformation behavior of continuous casting bloom during HR and developed the two-stage sequential heavy reduction technology.…”

Section: Introductionmentioning

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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Thermo-Mechanical Behavior of the Continuous Casting Bloom in the Heavy Reduction Process

Cited by 54 publications

References 21 publications

Review on Modeling and Simulation of Continuous Casting

Review on Modeling and Simulation of Continuous Casting

Finite Element Analysis of Dynamic Recrystallization of Casting Slabs during Hot-Core Heavy Reduction Rolling Process

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

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