A Simple Model to Calculate Dendrite Growth Rate during Steel Continuous Casting Process

Long, Mujun; Zhang, Lifeng; Lu, Fei

doi:10.2355/isijinternational.50.1792

Cited by 9 publications

(7 citation statements)

References 21 publications

(24 reference statements)

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“…At a certain distance from the surface, R is found to increase rapidly and G to decrease rapidly. A similar effect was also observed by Mapelli and Borgiola 11) and Long et al 16) A comparison with the data listed in Table 2 shows that this particular behavior is attained in the equiaxed zone. Correspondingly, the solidification time, tf, is seen to increase with the distance from the surface and to reach a plateau close to the center of the round billet.…”

Section: Resultssupporting

confidence: 69%

Modeling Solidification Microstructures of Steel Round Billets Obtained by Continuous Casting

et al. 2011

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The knowledge of the position of the columnar to equaxial transition (CET) is of paramount importance to evaluate the internal quality of continuous casting (CC) products. One way to control the operational CC conditions with the objective of assuring a given quality level is to develop a numerical program able to calculate the local solidification rate (R), the local thermal gradient (G) and the local time of solidification (tf) and to relate these parameters to the CET by means of a predictive model. In the present investigation, the dendritic morphology and the CET transition of three round billets made of a low carbon steel (0.14%C) and produced by CC are characterized, and a computer model is developed to evaluate the R, G and tf-parameters. Referencing the well-known CET transition model developed by Hunt, a simple prediction equation is thus obtained for the steel under study and it is used to propose guidelines for the optimization of the CC operational parameters.

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Section: Resultssupporting

confidence: 69%

Modeling Solidification Microstructures of Steel Round Billets Obtained by Continuous Casting

et al. 2011

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“…The solidification rate was the highest close to the meniscus and steadily decreased with distance from the meniscus along the casting direction. The range of solidification rates in Figure 7(a) was similar to that of the reported [38] dendrite growth rates in the continuous casting process. The velocity magnitude close to the surface was low, and then, it increased up to a certain distance from the meniscus.…”

Section: Comparison Of Dendrite Bending Anglessupporting

confidence: 81%

A Multiscale-Based Approach to Understand Dendrite Deflection in Continuously Cast Steel Slab Samples

Sengupta

Santillana

Sridhar

et al. 2021

Metall Mater Trans A

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Dendrite bending angle measurements were conducted along two different directions on four steel slab samples collected from a conventional caster. The primary dendrites growing at the slab surface showed a transition in their growth direction as the distance from the surface increased. Numerical fluid flow simulation showed changes in the flow directions that might have caused the change in the growth direction. The bending angle measurements were also correlated with the casting process parameters. Thereafter, a multiscale approach was adopted to predict the dendrite deflection angles by correlating the macro-scale flow profile with the micro-scale bending angle formulation and subsequently corroborated with the industrial scale measurements.

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“…In the central region, however, R increases owing to a higher dendritic growth rate in the final stages of solidification. This behaviour was observed by Long et al (2010) and Mapelli and Baragiola (2008) too. The time for complete solidification of billet is estimated to be around 283 s, for which, the metallurgical length comes out to be around 11.8 m.…”

Section: Resultssupporting

confidence: 64%

Mathematical modelling of morphological transition and spot segregation in continuously-cast high carbon steel billets

Chaube

2018

IJESMS

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In this work, the columnar-to-equiaxed transition (CET) and spot segregation phenomena in continuously-cast (CC) high carbon steel billets are investigated. Casting process is simulated for a 125 mm × 125 mm billet using a macroscopic thermal model. An empirical correlation, depicting the effect of melt temperature on heterogeneous nuclei density, is incorporated in the CET model to account for a more realistic variation of CET with melt superheat. A parametric study is also performed to see the influence of casting speed on CET and explore its theoretical limit for plant operation. The model is sufficiently general and can be utilised for different caster designs and processing conditions. Additionally, an attempt is made to estimate the degree of solute segregation in small spots along the billet centreline using a simple microsegregation model. The model predictions are compared with experimental observations on CC high-carbon steel billets and the results are encouraging.

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A Simple Model to Calculate Dendrite Growth Rate during Steel Continuous Casting Process

Cited by 9 publications

References 21 publications

Modeling Solidification Microstructures of Steel Round Billets Obtained by Continuous Casting

Modeling Solidification Microstructures of Steel Round Billets Obtained by Continuous Casting

A Multiscale-Based Approach to Understand Dendrite Deflection in Continuously Cast Steel Slab Samples

Mathematical modelling of morphological transition and spot segregation in continuously-cast high carbon steel billets

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