Performance of Electromagnetic Purification System in Continuous Twin Roll Casting of Aluminum Sheet

2007 ◽  
Vol 546-549 ◽  
pp. 1043-1048 ◽  
Author(s):  
Da Shu ◽  
Jun Wang ◽  
Bao De Sun
Keyword(s):  
Aluminum Foil ◽  
Ceramic Foam ◽  
Metallographic Analysis ◽  
Inclusion Removal ◽  
Twin Roll Casting ◽  
Foam Filter ◽  
Roll Casting ◽  
Purification System ◽  
Twin Roll

Metallurgical quality of roll casting sheet is crucial to ensure the performance of aluminum foil. An electromagnetic purification system was installed in a twin roll casting line in order to improve the molten metal cleanliness. Metallographic analysis shows that inclusion particles larger than 10 μm can be eliminated from molten aluminum by electromagnetic purification and a total inclusion removal efficiency of 75% is achieved additional to the filtration by a ceramic foam filter. The electromagnetic purification system operated reliably and consistently during the casting campaign.

Kiss-Point Position Control of Solidification Layer and Process Optimization for Twin-Roll Casting of Magnesium Alloys

2011 ◽  
Vol 189-193 ◽  
pp. 3844-3851
Author(s):  
Wen Ping Weng ◽  
Kang Deng ◽  
Zhong Ming Ren ◽  
Qi Chen ◽  
Zhi Dong Chi ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Process Optimization ◽  
Strip Thickness ◽  
Alloy Strip ◽  
Roll Speed ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

The solidification and process optimization for twin-roll casting of magnesium alloys have been studied. Effects of roll speed, roller diameter, setback length and strip thickness on the position of the solidification front and the surface quality of strip were analyzed through experiments. A kiss-point model which considers the strip thickness, set-back length and roll speed was established to optimize process and enhance the surface quality of magnesium alloy strip. Results showed that the twin-roll casting process could be effectively stabilized and optimized under the direction of the model, and the defectless magnesium alloy strip was obtained.

Microstructure and Tensile Properties of Al-(5~10)wt%Mg Alloy Sheets Fabricated by Twin Roll Casting and Rolling Process

2010 ◽  
Vol 443 ◽  
pp. 45-50 ◽  
Author(s):  
Hyoung Wook Kim ◽  
Jae Hyeng Cho ◽  
Cha Yong Lim ◽  
Suk Bong Kang
Keyword(s):  
Tensile Properties ◽  
Surface Quality ◽  
Intermetallic Particle ◽  
Process Condition ◽  
High Strength ◽  
Mg Alloy ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

High strength Al-Mg alloy strips with high Mg contents (5-10wt%Mg) were successfully fabricated by twin roll casting. In order to get a good surface quality of Al-Mg strips, an optimum process condition was investigated in this experiment. The morphology of the cast nozzle and the roll separate force during twin roll casting was important to improve the surface quality of the strip and homogeneity of the cast structure through the thickness. The size of intermetallic particle like Al-Fe compounds was reduced down to 1~2m due to a high cooling rate of Al melt during strip casting. In addition, the dendrite structure was very fine and the segregation of Al8Mg5 phase between grains was remarkably reduced. Therefore, the Al-Mg strips have good workability during additional cold/warm rolling processes. After annealing, the rolled sheets have superior tensile properties to a commercial high strength Al-Mg alloy sheet.

Solidification Mechanism of the Melt Conditioned Twin Roll Cast Magnesium Alloy

2014 ◽  
Vol 790-791 ◽  
pp. 291-295 ◽  
Author(s):  
Sanjeev Das ◽  
Nilam S. Barekar ◽  
Zhong Yun Fan
Keyword(s):  
Az31 Alloy ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Columnar Grains ◽  
Cast Magnesium ◽  
Twin Roll Cast ◽  
Solidification Mechanism ◽  
Twin Roll ◽  
Strength And Ductility

Twin roll casting (TRC) has been demonstrated to be a process capable of producing Mg sheets at a significantly reduced cost. However, the quality of the Mg sheets produced by the TRC process is limited due to the formation of coarse columnar grains and severe centreline segregation, which reduces both the strength and ductility of Mg-alloys. In this paper, melt conditioned (MC) has been employed prior to twin roll casting (TRC) of AZ31 alloy to understand its effect on the solidification mechanism. For comparison, AZ31 alloy strips were also produced through conventional TRC process. The results showed that the solidification mechanism can be completely altered by introducing MC in TRC process.

scholarly journals Influence of Twin-Roll Casting Speed on Microstructural Homogeneity, Centerline Segregation, and Surface Quality of Three Different Mg Alloys

JOM ◽  
2021 ◽  
Author(s):  
J. Victoria-Hernández ◽  
G. Kurz ◽  
J. Bohlen ◽  
S. Yi ◽  
D. Letzig
Keyword(s):  
Surface Quality ◽  
Az31 Alloy ◽  
Mg Alloys ◽  
Centerline Segregation ◽  
Twin Roll Casting ◽  
Fine Grained ◽  
Roll Casting ◽  
Columnar Grains ◽  
Twin Roll

AbstractIn this work, the influence of twin-roll casting (TRC) speed on the microstructure of the through-thickness uniformity, centerline segregation, and surface quality of three wrought Mg alloys was investigated. The microstructural features of the AZ31, ZX11, and ZWK200 alloys produced at TRC speeds ranging from 1.8 m/min to 2.2 m/min (for the AZ31 and ZWK200), and 1.5–2.5 m/min (for the ZX11 alloy) were analyzed. There were clear differences in the microstructure uniformity depending on the alloy composition. Columnar grains coexisting with globular grains were found in the AZ31 and ZX11 alloys, whereas the ZWK200 alloy showed a homogeneous fine-grained microstructure characterized by a weaker texture even at the highest TRC speed used. While there is a tendency to reduce the centerline segregation as the TRC speed is decreased during casting of the AZ31 alloy, the formation of this defect cannot be prevented in the ZX11 and ZWK200 alloys by only varying the TRC speed.

scholarly journals Strip Quality of Highly Alloyed Metals by Twin Roll Casting.

1991 ◽  
Vol 31 (7) ◽  
pp. 689-695 ◽  
Author(s):  
Shigeru Miyake ◽  
Hiroshi Yamane ◽  
Masao Yukumoto ◽  
Michiharu Ozawa
Keyword(s):  
Twin Roll Casting ◽  
Roll Casting ◽  
Strip Quality ◽  
Twin Roll

Melt Conditioned Twin Roll Casting (MC-TRC) for Aluminium Alloys

2014 ◽  
Vol 794-796 ◽  
pp. 1115-1120 ◽  
Author(s):  
Nilam S. Barekar ◽  
Sanjeev Das ◽  
Zhong Yun Fan
Keyword(s):  
Mechanical Performance ◽  
Downstream Processing ◽  
Al Alloys ◽  
Al Alloy ◽  
Solute Content ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Wide Range ◽  
Twin Roll

Twin roll casting (TRC) has been demonstrated to be an effective route for producing Al sheet at a reduced cost. However, the quality of the Al alloys sheets produced by the TRC process is limited by the formation of centreline segregation, which hampers the downstream processing, degrade the mechanical performance of the final rolled products, limit TRC to dilute alloys with a narrow freezing range, and hence prevent its application in a wide range of engineering sectors. To improve the quality of the TRC strips, a new technology, melt conditioning twin roll casting (MC-TRC) has been developed. It has been demonstrated that the MC-TRC process is capable of producing Al-alloy strips with minimal centerline segregation which is attributed to enhanced nucleation by well dispersed naturally occurring oxides in liquid Al alloys. This work aims to investigate the upper composition limit allowed for the MC-TRC process using the binary Al-Mg alloys as model alloys. The results showed that melt conditioning increases the range of alloys (solute content up to 7%) that can be twin roll cast without severe segregation.

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