Solidification and Melting of Aluminum onto Circular Cylinders Under Forced Convection: Experimental Measurements and Numerical Modeling

Steel strip feeding into continuous casting mold is an innovative technology improving the slab quality through decreasing the melt superheat and increasing the proportion of equiaxed dendrites. To investigate the embedded complex melting and solidification processes, a mathematical model has been developed to model all the essential physical behaviors of the fluid flow, heat transfer, melting, and solidification during steel strip feeding into the mold. The enthalpy method is adopted to describe both the melting of steel strip and the solidification of slab. The complex heat transfer between cold steel strip and hot melt is considered. The melting of moving strip and the growth of solidified shell are compared with the experimental measurements and empirical equation, respectively. The validated model is then used to predict the melting and solidification characteristics during steel strip feeding into the mold. Based on the experimental and numerical findings, the whole melting process of steel strip can be divided into three periods: the steel sheath formation, steel sheath melting, and steel strip melting. Effects of the strip thickness (d0), melt superheat (ΔT), and strip feeding speed (va) on the melting of steel strip have been analyzed. An empirical equation is proposed to correlate the total melting time with aforementioned parameters: lntm=3.748+1.406lnd0−0.32lnva−0.794lnΔT. Furthermore, sensitivity study has also performed to reveal the influence of the strip thickness, melt superheat, and strip feeding speed on the final strip tip position.

h \cdot true(T_{m} - T_{L} true)

) abstracting the heat flux dissipated in the solid (

k_{s h} \frac{\partial T}{\partial x}

).…”

Section: Resultsmentioning

confidence: 99%

Section: Melting Process Of Steel Stripmentioning

confidence: 99%

Melting of Moving Strip during Steel Strip Feeding in Continuous Casting Process

Niu

Liu

et al. 2018

“…Driven by a huge temperature gradient, a layer of frozen sheath quickly forms on the strip surface. [42] Its growth rate weakens as the insertion time increases. [41] 2.1.2.…”

Section: Stage I: Frozen Sheath Formationmentioning

confidence: 99%

“…Large thickness prevents heat flow from instantly penetrating the strip steel along the thickness direction. [42] Meanwhile, the heat from the narrow surface becomes non-negligible, so the strip melting behavior changed. Therefore, it can be confirmed that d 0 is a linear function of t m in the thickness range of 0-5 mm.…”

Section: Strip Initial Thicknessmentioning

confidence: 99%

Feeding Steel Strip Technology in Continuous Casting Process: A Review

Geng

Zhao²,

Zang

et al. 2021

“…The solidification–melting model is widely used to simulate the transition between the solid and liquid phases using the enthalpy porous medium method. [ 22 ] However, this method pays less attention to the coupling between solute precipitation and crystal growth and cannot identify equiaxed and columnar phases from the solid phase. Great progress has been made in modeling the complex phenomena of solidification–melting processes by multiscale coupling.…”

Section: Introductionmentioning

confidence: 99%

Effect of Feeding Strip Temperature on Macrosegregation in a Large Continuous Casting Round Bloom

Yao

Liu

Rong

et al. 2023

Feeding a cold steel strip into continuous casting (CC) mold is an effective method to improve the quality of large round bloom. However, it is difficult to assess the correlation between the bloom quality and the initial temperature of the strip. Therefore, a three‐phase mixed columnar–equiaxed solidification model is developed to evaluate the effect of feeding strip temperature on macrosegregation and solidification structure in a large vertical CC round bloom. The results show that feeding the steel strip induces “crystal rain” in the liquid core of the bloom and increases the volume fraction of the equiaxed phase. After feeding a strip, the flow direction of molten steel is changed, and the flow velocity is increased in the liquid core of the bloom. Furthermore, with initial temperature of the strip decreases, the production efficiency is improved. Compared to the four conditions investigated, the carbon distribution in the bloom is the most uniform, the negative segregation at the centerline of the bloom is the weakest with the value of −35.50%, and the extreme value difference of the macrosegregation index at 20 m below the meniscus is the smallest with the value of 38.35% under the condition of Tinitial = 500 K.