Coupled analysis of temperature and flow during twin-roll casting of magnesium alloy strip

2011 ◽  
Vol 211 (6) ◽  
pp. 1197-1202 ◽  
Author(s):  
Hu Zhao ◽  
Peijie Li ◽  
Liangju He
Keyword(s):  
Magnesium Alloy ◽  
Coupled Analysis ◽  
Alloy Strip ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

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.

Numerical simulation of the twin-roll casting process of magnesium alloy strip

2009 ◽  
Vol 209 (5) ◽  
pp. 2321-2328 ◽  
Author(s):  
Jian Zeng ◽  
Roger Koitzsch ◽  
Herbert Pfeifer ◽  
Bernd Friedrich
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Casting Process ◽  
Alloy Strip ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

scholarly journals Magnesium Alloy Strip Produced by a Melt-Conditioned Twin Roll Casting Process

2011 ◽  
Vol 690 ◽  
pp. 129-132 ◽  
Author(s):  
Iman Bayandorian ◽  
Yan Huang ◽  
Geoff M. Scamans ◽  
Zhong Yun Fan
Keyword(s):  
Magnesium Alloy ◽  
Tensile Elongation ◽  
Casting Process ◽  
Downstream Processing ◽  
Alloy Strip ◽  
Az91 Magnesium Alloy ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Az91 Magnesium ◽  
Twin Roll

Melt conditioning by intensive shear was used prior to twin roll casting of an AZ91 magnesium alloy strip to promote heterogeneous nucleation and produce a refined and uniform microstructure without severe macro-segregation. The as-cast strip was then processed by homogenization, hot rolling and annealing and the microstructural behaviour during the downstream processing was examined and compared with the strip of the same alloy produced without melt conditioning. The melt conditioned strip after downstream processing displayed significantly improved mechanical properties with an average tensile elongation of ~16%, compared with ~10% for the strip produced without melt conditioning and the reported values of ~1.5-6.2% in the literature.

Properties of AZ31 Magnesium Alloy Sheet Produced by Twin Roll Casting

2005 ◽  
Vol 488-489 ◽  
pp. 419-426 ◽  
Author(s):  
Yusuke Nakaura ◽  
Koichi Ohori
Keyword(s):  
Magnesium Alloy ◽  
Az31 Alloy ◽  
Az31 Magnesium Alloy ◽  
Rolled Sheet ◽  
Alloy Strip ◽  
Cast Strip ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Hot Rolled ◽  
Twin Roll

Twin roll casting has been used to produce AZ31 magnesium alloy strip. The size of the cast strip is 5mm thick and 250mm wide. The microstructure of the as-cast AZ31 alloy strip consists of columnar zones from the surface to mid-thickness region and equiaxed zones in the mid-thickness region. The secondary dendrite arm spacing varies from 5.0 to 6.5 μm through the thickness and width of the strip and is much smaller than 34μm of an AZ31 alloy DC ingot used for comparison. In the temperature ranging from room temperature to 400°C, the tensile strength and elongation of the as-cast strip are higher and smaller than those of DC ingot, respectively. Elongation is evidently improved by homogenization treatment and becomes more than that of the DC ingot. Such an improvement of elongation is though to be caused by homogenization of segregation of Al and Zn atoms in the dendrite cell boundaries. The non-homogenized and homogenized strips were subsequently hot rolled. Their hot rolled sheets have much higher value of elongation with equivalent strength, compared to the hot rolled sheet of flat-bar extruded from DC ingot in the temperature ranging from 200°C to 300°C.

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