Evolution of Austenite Grain Size in Continuously Cast Slab during Hot‐Core Heavy Reduction Rolling Process Based on Hot Compression Tests

Gong, Meina; Li, Haijun; Wang, Bin; Wang, Zhaodong

doi:10.1002/srin.201800025

Cited by 10 publications

(14 citation statements)

References 31 publications

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“…According to a previous work [19], for the Nb-Ti microalloyed steel selected in this study, hot compressive deformation tests were conducted using thermo-mechanical simulator (Gleeble-3800, Dynamic Systems Inc., Poestenkill, NY, USA). The specimens were reheated to 1400 • C and held for 180 s to ensure that the austenite grain size was close to the coarse grain size of the original continuously cast slab.…”

Section: Modeling Of Drx During Hhrmentioning

confidence: 99%

“…In recent studies [18,19], an innovative process called hot-core heavy reduction rolling (HHR 2 ) was proposed to eliminate the internal porosity defects of casting steel with heavy thickness. In the HHR 2 process, a two-high rolling mill is installed after the solidification end of the strand.…”

Section: Introductionmentioning

confidence: 99%

“…According to an existing study, a new roll profile for HHR 2 was designed to obtain the best effect on shrinkage closure [18]. The dynamic recrystallization (DRX) model of the Nb-Ti microalloyed steel was also established for the HHR 2 deformation process [19]. In this study, the DRX model was embedded into the finite element software via secondary development.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Modeling Of Drx During Hhrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…[14] On the other hand, the HHR 2 process can promote the dynamic recrystallization (DRX), which can obtain a better uniformity of microstructure comparing with the original casting slab. [15,16] Furthermore, the DRX behavior may be different from the conventional hot rolling (CHR) process because a greater deformation DOI: 10.1002/srin.202300043 Hot-core Heavy Reduction Rolling (HHR 2 ) is a new technology that improves the core quality of blooms by using a heavy reduction roller at the solidification end. Dynamic recrystallization (DRX) is expected to optimize the microstructure in this process.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Dynamic Recrystallization in Blooms between Conventional Rolling and Hot‐Core Heavy Reduction Rolling Process

Gao

et al. 2023

steel research int.

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Hot‐core Heavy Reduction Rolling (HHR2) is a new technology that improves the core quality of blooms by using a heavy reduction roller at the solidification end. Dynamic recrystallization (DRX) is expected to optimize the microstructure in this process. But the difference of DRX characteristic between HHR2 and conventional hot rolling (CHR) is an unclear problem. Herein, the differences of DRX behavior between two rolling processes are studied. If two rolling processes are carried out under the same deformation temperature and strain rate, the work hardening in CHR samples is greater than that in HHR2. Moreover, DRX occurrence in HHR2 lags behind the CHR process due to lower growth rate of dislocation density achieved in HHR2. By using DRX models, the DRX area and DRX volume fractions in bloom are calculated. The great temperature gradient and low strain rate decrease the DRX critical strain in the HHR2 process. The DRX region is mainly around the core of the HHR2 bloom, where the DRX volume fraction achieves 41.8%. The maximum value of DRX volume fraction in CHR bloom only achieves 20.1% because the great strain rate and uniform temperature lead to a low level of deformation permeability.

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“…Many investigations have focused on the mechanisms of austenite microstructure evolution, especially for some austenite steels [5][6][7][8][9]. It is found that the DRX or MDRX, respectively occurring during the hot deformation process and the intervals of multi-pass deformation [10][11][12], are favorable for the refinement of austenite grains and improvement of the subsequent mechanical properties, while the effect of DRX on microstructure and mechanical properties shows strong dependence on hot deformation conditions as well as chemical composition [13,14]. Moreover, the macro or micro texture evolution during the hot deformation has been well studied, especially for alloys without phase transformation, 1 3 such as aluminum alloys, magnesium alloys and the austenitic steel [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Evolution of Austenite Microstructure and Texture During Hot Compression of 5CrNiMoV Steel

Wang

Yang³

2020

Metallogr. Microstruct. Anal.

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Deformation behaviour of 5CrNiMoV steel was investigated at temperature 830-1230 °C and strain rate 0.001-10 s −1 . The flow curves were analyzed to illuminate the deformation characteristics. Comprehensive austenite microstructural investigation was carried out using optical microscope for deformed samples. It was found that discontinuous dynamic recrystallization mechanism played a leading part in the nucleation of dynamic recrystallization (DRX) nuclei and growth of DRX grains, and that the austenite grain size increased with deformation temperature, while a larger strain rate was conducive to grain refinement for the quickly generated strain storage-energy favorable for higher DRX nucleation rate. The parent austenite texture evolution and typical martensitic transformation texture for some deformed samples were characterized using electron backscattering diffraction technique and the software of the reconstruction of parent austenite. It was found that increasing temperature contributed to the increase of its maximum of random distribution (MRD) and the strength of rotated Cube texture component, which was probably for the behavior DRX and growth of DRX grains during the hot deformation. The rotated Cube was weakened with the strain rate rising, while the main texture component did not change significantly, which was due to the increase in number of active slip systems and grain fragmentation. Besides, the martensitic transformation texture was related to the parent texture for the variant selection.

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Evolution of Austenite Grain Size in Continuously Cast Slab during Hot‐Core Heavy Reduction Rolling Process Based on Hot Compression Tests

Cited by 10 publications

References 31 publications

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

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

Comparison of Dynamic Recrystallization in Blooms between Conventional Rolling and Hot‐Core Heavy Reduction Rolling Process

Deformation Behavior and Evolution of Austenite Microstructure and Texture During Hot Compression of 5CrNiMoV Steel

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