High-Speed and Low-Load Twin-Roll Casting of Al–5%Mg Strip

Yamazaki, Kazuki; Haga, Toshio

doi:10.3390/met13010072

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…However, in recent times, there has been active research and development on the manufacturing of high-alloy Al alloys, particularly for the production of sheets used in transportation equipment [7,8]. For high-alloy Al, such as the 5xxx series and 6xxx series, manufacturing is particularly challenging during continuous casting due to the wide freezing temperature range of the alloys [9][10][11][12]. This makes the process susceptible to surface inverse segregation and vulnerable to central segregation, posing significant difficulties in production [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Metallurgical Method of Determining Heat Transfer Coefficient in Simulations of Twin-Roll Casting

Kim,

Kim

2024

Metals

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We herein suggest a metallurgical method using pure aluminum with no freezing temperature range to derive appropriate roll/melt interfacial heat transfer coefficients in simulation of twin-roll casting process. This method is inspired by the concept that the position of the kiss points where two solidifying shells encounter and the roll nip coincides under the condition where the roll load becomes zero as the roll rotation speed decreases. The conditions where the roll load becomes zero under various melt supply temperature conditions in the actual TRC process are found experimentally. These conditions are then applied to simulation models to derive heat transfer coefficient values. When comparing these values with those derived previously from the empirical relation for roll rotation speed and heat transfer coefficient, the conclusion is drawn that the deviation was reasonably low, around 10%.

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Section: Introductionmentioning

confidence: 99%

Metallurgical Method of Determining Heat Transfer Coefficient in Simulations of Twin-Roll Casting

Kim,

Kim

2024

Metals

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“…An Al-5%Mg alloy can be cast into a strip at a roll load larger than 2 N/mm. The effect of roll load on the microstructure and segregation of an Al-5%Mg strip has been investigated [13]. It is thought that Mg segregation is suppressed as the Mg content increases.…”

Section: Introductionmentioning

confidence: 99%

Effect of Roll Load on Microstructure of Roll Cast Al-10%Mg Strip

Haga,

Yamazaki,

Watari

et al. 2023

MSF

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The effect of roll load on the microstructure of an Al-10%Mg strip cast using a vertcal-type high-speed twin-roll caster was investigated using roll stop and etching with Weck’s reagent. Roll stop was adopted to investigate the transformation of the microstructute near the roll bite. Weck’s reagent was used to visually determine the of the Mg solid-solution content. The roll load was 2, 88, or 420 N/mm and the roll speed was 30 m/min. A band zone formed at the center of the thickness direction for all roll loads. The Mg solid-solution content in the αAl in the band zone obtained at a roll load of 2 N/mm was greater than that obtained at roll loads of 88 and 420 N/mm. Recrystalization migh occur in the band zone of the strip at a roll load of 2 N/mm. The Mg solid-solution content in αAl near the surface was greater than that inside the strip in the thickness direction. The Mg solid-solution content in αAl near surface obtained at a roll load of 2 N/mm was greater than that obtained at roll loads of 88 and 420 N/mm.

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Correlation of digital twin and roll surface sensor results for AZ31 alloy TRC process

Kwiecień,

Weiner,

Lypchanskyi

et al. 2024

J Mater Sci

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Due to the growing interest in lightweight constructions, the continuous casting of nonferrous metals is continuously developing as a result of the cost-effectiveness of this process, which combines several stages of sheet production. Unfortunately, because of the characteristics of the process, the parameters in the roll gap, such as, for example, pressure and temperature, are unknown, significantly affects the understanding of the phenomena occurring in the material during rolling. Therefore, at IMF Freiberg, a sensor consisting of a piezo sensor and two thermocouples measuring the temperature at two different heights was mounted on the surface of the roll, making it possible to control the process parameters live during the TRC trial. The measurements were further supported by a digital twin in the form of a layer model, combining a viscous and solid region for each layer in a single tool. The computations in this tool are performed offline and the computation time is in the order of seconds, thus much less than that of the finite element method. Because the layer model measures the temperature of the magnesium strip, FEM simulations were used to validate measurements from thermocouples. Experimental results have been obtained that allow for a direct correlation between the development of the pressure and temperature and the length of the fully solidified LD part in the roll gap zone, which correlates directly with the effective total equivalent strain. Using the sensor and layer model, it is possible to train a digital twin that can be used for online estimation of the final strip properties obtained in the TRC process. Graphical abstract

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High-Speed and Low-Load Twin-Roll Casting of Al–5%Mg Strip

Cited by 6 publications

References 16 publications

Metallurgical Method of Determining Heat Transfer Coefficient in Simulations of Twin-Roll Casting

Metallurgical Method of Determining Heat Transfer Coefficient in Simulations of Twin-Roll Casting

Effect of Roll Load on Microstructure of Roll Cast Al-10%Mg Strip

Correlation of digital twin and roll surface sensor results for AZ31 alloy TRC process

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