Numerical and experimental investigation of solidification structure evolution and reduction of centre segregation in continuously cast GCr15 bloom

An, Hanghang; Bao, Yanping; Min, Wang Kee; Yang, Quan; Dang, Yanyin

doi:10.1080/03019233.2019.1672447

Cited by 14 publications

(4 citation statements)

References 23 publications

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“…Zhao et al [10] adopted a two-dimensional cellular automaton (CA) model and finite element (FE) method to simulate solidification structure formation during continuous casting of beam billet, which represents the growth of columnar and equiaxial dendrites under detailed secondary cooling boundary conditions. An et al [11] established the CAFE model and SDAS model in order to study the evolutionary behavior of macrostructure and secondary dendrites, respectively, on a 220 × 260 mm 2 bloom cross-section of GCr15 bearing steel. Based on numerical simulation and experiments, the effects of process parameters on center ECR and SDAS are investigated.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Study on the Effect of Superheat on Solidification Microstructure Evolution of Billet in Continuous Casting

Tian,

Zhang,

Yan

et al. 2024

Materials

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The control of the solidification structure of a casting billet is directly correlated with the quality of steel. Variations in superheat can influence the transition from columnar crystals to equiaxed crystals during the solidification process, subsequently impacting the final solidification structure of the billet. In this study, a model of microstructure evolution during billet solidification was established by combining simulation and experiment, and the dendrite growth microstructure evolution during billet solidification under different superheat was studied. The results show that when the superheat is 60 K, the complete solidification time of the casting billet from the end of the 50 mm section is 252 s, when the superheat is 40 K, the complete solidification time of the casting billet is 250 s, and when the superheat is 20 K, the complete solidification time of the casting billet is 245 s. When the superheat is 20 K, the proportion of the equiaxed crystal region is higher—the highest value is 53.35%—and the average grain radius is 0.84556 mm. The proportion of the equiaxed crystal region decreases with the increase of superheat. When the superheat is 60 K, the proportion of the equiaxed crystal region is the lowest—the lowest value is 46.27%—and the average grain radius is 1.07653 mm. Proper reduction of superheat can obviously reduce the size of equiaxed crystal, expand the area of equiaxed crystal and improve the quality of casting billet.

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Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Study on the Effect of Superheat on Solidification Microstructure Evolution of Billet in Continuous Casting

Tian,

Zhang,

Yan

et al. 2024

Materials

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“…The formation mechanisms of center segregation have been investigated by many researchers. [3][4][5][6][7] The low superheat casting, [8][9][10] electromagnetic stirring, [11][12][13][14] and mechanical reduction [15][16][17][18] were proposed to reduce the center segregation defect in the continuous casting. However, the influence of RGD [19,20] on solute redistribution is less studied, even though it is commonly observed in the continuous caster.…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the segregation defect in continuous casting, several methods have been proposed. As to lower superheat casting, An et al [ 8 ] indicated that the equiaxed zone ratio increased, the columnar zone reduced, and the secondary arm spacing decreased. With the superheat lower than 10 °C, Pikkarainen et al [ 9 ] reported that the center negative segregation formed, due to the globular grain sedimentation.…”

Section: Introductionmentioning

confidence: 99%

Roll‐Gap Deviation on Centerline Segregation Evolution in Continuous Casting Slab

Jiang

Zhu

Zhang

2023

steel research int.

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Roll‐gap deviation (RGD) is commonly observed in the slab continuous caster, which means the thicknesses of the right and left sides are different. The RGD amounts and positions on the solute redistribution are investigated. In the RGD zone, slab thickness decreases from the left to the right side. Dynamic grid technology is used to consider the mesh deformation in the model. When RGD is set before the solidification end of the slab middle part, the center segregation in the right‐edge part decreases but that in the left‐edge part increases. That is because the solute‐enriched liquid moves from the right to the left side with solid compression. When RGD is set after the slab middle part is solidified, the center segregation in the right‐edge part is deteriorated, while that in the left‐edge part is reduced. This is because the slab right‐edge part is fully solidified in the RGD zone, and the segregation cannot be reduced in the later stage. With the RGD position moving from 15.5 to 18.0 m from the meniscus, the center segregation in the right‐edge part decreases first and then increases, while that in the left‐edge part increases slightly and then declines.

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“…El-Bealy et al [7] established mathematical models to predict SDAS, and found that SDAS has an exponential relationship with the local solidification time (LST). An et al [8] found smaller SDAS can make the solidification…”

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confidence: 99%

Solidification structure simulation and casting process optimization of GCr15 bloom alloy

Liu

et al. 2022

China Foundry

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Continuous casting process is the main method to prepare GCr15 steel, but the macrosegregation of bloom is very serious, which leads to inhomogeneity of the mechanical properties of final products [1] . Although prolonging the reheating time reduces the macrosegregation, it increases the production cost. The best opportunity to control macrosegregation is still in the casting process. There are two main means to control the macrosegregation of bloom, which are soft reduction and electromagnetic stirring [2][3][4][5] . The main purposes of these two means are to compensate the solidification end shrinkage and improve the equiaxed crystal rate (ECR). However, the influence of solidification characteristics structure on macrosegregation should not be ignored. Both primary dendritic arms spacing (PDAS) and secondary dendritic arm spacing (SDAS) are significant parameters that characterize the solidification structure [6] . El-Bealy et al. [7] established mathematical models to predict SDAS, and found that SDAS has an exponential relationship with the local solidification time (LST). An et al. [8] found smaller SDAS can make the solidification

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Numerical and experimental investigation of solidification structure evolution and reduction of centre segregation in continuously cast GCr15 bloom

Cited by 14 publications

References 23 publications

Simulation and Experimental Study on the Effect of Superheat on Solidification Microstructure Evolution of Billet in Continuous Casting

Simulation and Experimental Study on the Effect of Superheat on Solidification Microstructure Evolution of Billet in Continuous Casting

Roll‐Gap Deviation on Centerline Segregation Evolution in Continuous Casting Slab

Solidification structure simulation and casting process optimization of GCr15 bloom alloy

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