Effects of Casting Speed on Thin Gauge Foil Surface Quality of 8079 Aluminum Alloy Produced by Twin Roll Casting Method

A horizontal-type twin roll casting method has been popular for producing aluminum alloy strips, however, it is characterized by a relatively low productivity (1~6 m/min). In contrast, a vertical-type high-speed twin-roll casting method possesses an extremely high productivity (60~120 m/min (1~2 m/s)) and an excellent heat extraction ability. The rapid cooling effect provided significant microstructure refinement and mechanical properties improvement in various kinds of cast aluminum alloy products. Not only “product to product recycling” but also “up-grade recycling” can be achieved by making good use of these merits. Two examples of application showing the potential of vertical-type high-speed twin roll casting method are presented. (1) Several kinds of Al-Si base alloy were cast into the strips. Not only strength and toughness but also formability was increased in the twin roll cast products. In particular, great improvement in deformability shows the potential of the twin-roll cast aluminum alloy products as substitutes for some wrought aluminum alloy products. (2) The vertical-type tandem twin-roll caster was able to fabricate a clad strip by single step. The A4045/A3003/A4045 aluminum alloy clad sheets produced by the twin-roll casting showed better mechanical properties than the conventional hot-roll bonded clad sheets.

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.443.45 ◽

2010 ◽

Vol 443 ◽

pp. 45-50 ◽

Cited By ~ 6

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.

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

JOM ◽

10.1007/s11837-021-04611-3 ◽

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.

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Relation between Surface Quality of Cast Strips and Meniscus Profile of Molten Pool in the Twin Roll Casting Process.

ISIJ International ◽

10.2355/isijinternational.36.417 ◽

1996 ◽

Vol 36 (4) ◽

pp. 417-423 ◽

Cited By ~ 13

Author(s):

Toshiaki Mizoguchi ◽

Ken-ichi Miyazawa ◽

Yoshiyuki Ueshima

Keyword(s):

Surface Quality ◽

Molten Pool ◽

Casting Process ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll ◽

Meniscus Profile

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Effect of Magnetostatic Field on Microstructure of 7075 Aluminum Alloy Strip Manufactured by Twin-Roll Casting

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.2427 ◽

2013 ◽

Vol 652-654 ◽

pp. 2427-2431 ◽

Cited By ~ 3

Author(s):

Xin Su ◽

G M Xu ◽

Y H Feng

Keyword(s):

Electromagnetic Field ◽

Aluminum Alloy ◽

Central Zone ◽

Alloy Strip ◽

7075 Aluminum Alloy ◽

Magnetostatic Field ◽

Dendritic Crystal ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

In this paper, the effect of magnetostatic field on the microstructure and microsegregation of 7075 aluminum alloy strip by twin-roll casting is researched , and the result shows that when no electromagnetic field is applied during the process of roll-casting , the microstructure of 7075 strip is most composed of coarse columnar and dendritic crystal , the direction of grains is equal to roll-casting direction. When the magnetostatic field with 0.13T intensity is applied during the twin-roll casting, the microstructural of strip becomes uniform ,refined and equiaxed at the central zone of strip, and the dendritic crystal at the surficial is disordered and refined significantly.

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Development of Aluminum Alloy AA5754 Production with a Different Magnesium Content by a Twin-Roll Casting Process

Metallurgist ◽

10.1007/s11015-015-0162-x ◽

2015 ◽

Vol 59 (7-8) ◽

pp. 705-711

Author(s):

K. Turbalioglu ◽

Y. Sun ◽

Y. Türen

Keyword(s):

Aluminum Alloy ◽

Casting Process ◽

Magnesium Content ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

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A Novel Approach to Improve the Microstructure and Mechanical Properties of Al–Mg–Si Aluminum Alloys during Twin-Roll Casting

Materials ◽

10.3390/ma13071713 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1713 ◽

Cited By ~ 1

Author(s):

Yong Li ◽

Chen He ◽

Jiadong Li ◽

Zhaodong Wang ◽

Di Wu ◽

...

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Crystallization Front ◽

Alloying Elements ◽

Cast Slab ◽

Energy Dispersion Spectroscopy ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll Cast ◽

Twin Roll

The main purpose of this present study was to investigate the different processing conditions on the microstructure, segregation behavior of alloying elements, and mechanical properties of Al−Mg−Si alloy twin-roll cast slab prepared using a novel twin-roll casting technology. The simulation of temperature field, distribution of alloying elements, tensile properties, hardness, and conductivity were examined by a Leica optical microscope, scanning electron microscopy, energy dispersion spectroscopy, electron probe microanalysis, and tensile tests. The results indicated that when the traditional twin-roll casting method was used to produce aluminum alloy strip, there are obvious centerline segregation defects due to the deep crystallization front depth and symmetrical solidification characteristics. When the forced-cooling technology was applied in the twin-roll casting process, by virtue of the changing of crystallization front depth and crystallization front shape, the segregation defects are obviously suppressed. Suggesting that this method can significantly improve the uniformity of alloying elements in the thickness direction of the twin-roll cast slab, ultimately improve the mechanical properties of AA6022 aluminum alloy.

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