Numerical simulation of the thermo-mechanical process for beam blank continuous casting

Chen, W.; Zhang, Y.Z.; Zhang, C.J.; Zhu, Lingkai; Wang, B.X.; Lu, Wei; Ma, Jian

doi:10.1016/s1006-7191(07)60034-9

Cited by 16 publications

(15 citation statements)

References 3 publications

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“…The definitions of the thermal resistances are given as follows: R 1 = 1.8 Â 10 À4 Â n water À0. 8 , v water is the velocity of water in the copper plate, which set to 10 m/s;…”

Section: Initial Conditions and Boundary Conditionsmentioning

confidence: 99%

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Mold taper optimization for continuous casting of H-beam blanks

Chen

Yang

Zhu

et al. 2019

Metall. Res. Technol.

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The objective of this study is to optimize the mold taper for continuous casting of H-beam blanks. A thermo-mechanical coupled mathematical model was established to analyze the heat transfer, solidification, and shrinkage of the strand in the mold based on the multiple load step method. Based on the simulation results of the air gap distribution in the mold, the mold taper was optimized at selected points on the surface of H-beam blank mold by minimizing the air gap thickness and the best taper scheme was proposed. The results show that the original mold tapers are relatively larger and the optimum mold tapers are as follows: (1) taper at the flange surface: 0.81%/m; (2) taper at the narrow face: 0.68%/m; (3) taper at the fillet: À1.44%/m. The optimum mold size obtained from taper optimization was used in the actual continuous casting process and based on the results, it can be concluded that the optimum mold taper scheme proposed in this study reduced the formation of surface cracks in H-beam blanks.

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“…The definitions of the thermal resistances are given as follows: R 1 = 1.8 Â 10 À4 Â n water À0. 8 , v water is the velocity of water in the copper plate, which set to 10 m/s;…”

Section: Initial Conditions and Boundary Conditionsmentioning

confidence: 99%

“…Chen et al conducted a transient thermo-mechanical FEM, analyzed the two-dimensional temperature and stress-strain fields of the solidification process in detail and search out the optimum cooling parameters [7]. Chen et al also optimized a cooling water project by using a multiobjective optimization program [8].…”

Section: Introductionmentioning

confidence: 99%

Mold taper optimization for continuous casting of H-beam blanks

Chen

Yang

Zhu

et al. 2019

Metall. Res. Technol.

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“…Moreover, the accurate determination of mold boundary conditions is extremely difficult experimentally. The heat flow q (kW/m 2 ) in the mold is calculated by q t α β = − , where α is an empirical constant, here α=2688; t is the casting time, s; and β is calculated by the following equation [10]:…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

“…Recently, finite element methods for the coupled analysis of fluid flow and heat transfer deformation behavior in the continuous casting process have been reported. Chen et al [10] developed a two-dimensional transient-coupled finite element model for the prediction of the solidification process to find the reasons for the typical defects of blooms. Kim et al [11] considered that a large tensile stress in the internal region of the flange tip could cause internal cracks by the coupled analysis of heat transfer and deformation.…”

Section: Introductionmentioning

confidence: 99%

Formation of internal cracks during soft reduction in rectangular bloom continuous casting

Ding

Tang

et al. 2012

Int J Miner Metall Mater

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To investigate the formation of internal cracks in GCr15 bearing steels during the soft reduction process in rectangular bloom continuous casting, fully coupled thermomechanical finite element models were developed using the commercial software MSC.MARC, and microstructures and fractographs were also observed. With the finite element models, the contours of temperature, equivalent plastic strain, and equivalent von Mises stress were simulated. It is observed that the fracture surfaces of internal cracks are covered by cleavage or quasi-cleavage facets. The region of internal cracks in the intergranular brittle fracture mode is in the mushy zone between the zero ductility temperature (ZDT) and the zero strength temperature (ZST). The simulated equivalent plastic strain in the crack region is 2.34%-2.45%, which is larger than the critical strain (0.4%-1.5%), and the equivalent von Mises stress is 1.84-5.05 MPa, which is within the range of critical stress (3.9-7.2 MPa), thus resulting in the occurrence of internal cracks. Reducing the soft reduction amount from 3 to 2 mm can lower the stress under the critical value.

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“…Onishi et al [2], destacam que devido ao formato do produto, o lingotamento contínuo de beam blank difere consideravelmente do lingotamento de placas e tarugos quanto às tensões internas e mecanismos de solidificação. Chen et al [3] e Lee et al [4], entre outros, ressaltam que a transferência de calor entre o veio e as paredes do molde, padrão do campo de velocidades (particularmente na região do menisco), padrão de oscilação do molde e fenômenos de segregação, durante o regime de solidificação, têm grande influência na qualidade interna e superficial do produto. Neste sentido, Kim et al [5], Lee et al [4] e Hibeller et al [6] detectaram a formação de um "gap" de ar na ponta do flange na etapa inicial da solidificação, o qual prejudica o processo de extração de calor, decrescendo a velocidade de solidificação.…”

Section: Introductionunclassified

Comportamento Do Jato De Aço E Análise Das Flutuações Superficiais Em Um Molde De Beam Blank

Peixoto¹,

Gabriel²,

Silva³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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ResumoA complexidade do formato do molde de beam blank aumenta a importância de se compreender o comportamento do fluxo no interior do mesmo. Neste estudo verificou-se a influência da profundidade de imersão e da velocidade de lingotamento sobre as características de fluxo em um molde de beam blank alimentado por duas válvulas tubulares. Os resultados das simulações matemáticas foram coerentes com os resultados do modelamento físico. A velocidade de espalhamento do jato na região do flange é maior que na alma e este fator pode acarretar na solidificação irregular da pele ao longo da seção transversal. A profundidade de penetração do jato variou entre 66cm e 77cm. A intensidade média de flutuação do menisco foi de 0,22mm, sendo a flutuação máxima encontrada de 0,85mm. Com base nos resultados obtidos, os parâmetros de operação sugeridos são: profundidade de imersão igual a 75mm e velocidade de lingotamento máxima de 1m/min. Palavras-chave: Beam Blank; Fluxo; PIV; PLIF. BEHAVIOUR OF STEEL JET AND ANALYSIS OF SURFACE FLUCTUATIONS IN A BEAM BLANK MOLD AbstractThe complexity of the beam blank mold geometry increases the importance of assessing the flow behavior inside the mold. This work is related to the influence of the immersion depth and the casting speed on the flow characteristics in a beam blank mold fed with two tubular nozzles. There was found a good agreement between the results obtained from physical modeling and CFD modeling. The liquid jet spreads itself faster at the flange region than at the web and this factor can lead to an non uniform shell thickness along the cross section. The jet penetration depth ranged between 66cm and 77cm. The average intensity of meniscus fluctuation was 0.22mm, and the maximum fluctuation was 0.85mm. Based on modeling results the suggested operating parameters are: SEN immersion of 75mm and maximum casting speed of 1m/min.

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Numerical simulation of the thermo-mechanical process for beam blank continuous casting

Cited by 16 publications

References 3 publications

Mold taper optimization for continuous casting of H-beam blanks

Mold taper optimization for continuous casting of H-beam blanks

Formation of internal cracks during soft reduction in rectangular bloom continuous casting

Comportamento Do Jato De Aço E Análise Das Flutuações Superficiais Em Um Molde De Beam Blank

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