scholarly journals Analysis of Thermal Stress during of Twin-Roll Casting of Magnesium Alloy

2012 ◽  
Vol 217-219 ◽  
pp. 1928-1933
Author(s):  
Yu Cheng Zhang ◽  
Tian Yang Han ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Magnesium Alloy ◽  
Process Parameters ◽  
Element Model ◽  
Spray Angle ◽  
Thermal Cracks ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

The process of twin-roll casting including pouring, solidifying, rolling and cooling can be accomplished in a very short time. Consequently, some important process parameters in the twin-roll casting that are difficult to be obtained in experiment can be acquired using numerical simulation. In this paper, a numerical simulation based on a 2D finite element model of vertical twin-roll strip casting of magnesium alloy has been conducted, and the thermal stress fields are significantly discussed. The influences of key process parameters consisting of submerged nozzle depth and nozzle spray angle have been studied. The thermal cracks on the surface of the strip are analysed according to the thermal stress distribution.

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

Temperature Field and Cast-Rolling Force Prediction during Horizontal Twin-Roll Casting Magnesium Alloy

2013 ◽  
Vol 747-748 ◽  
pp. 412-420 ◽  
Author(s):  
Xiao Ping Liang ◽  
Lei Xiao ◽  
Sang Sang Liao ◽  
Bin Jiang
Keyword(s):  
Temperature Field ◽  
Magnesium Alloy ◽  
Process Parameters ◽  
Casting Speed ◽  
Rolling Force ◽  
Pouring Temperature ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Cooling Intensity ◽  
Twin Roll

The control of process parameters in the horizontal twin-roll casting is crucial for the quality of sheet and the continuity of the process. A temperature field coupled with flow field mathematical model was established during the horizontal twin-roll casting of AZ31 magnesium alloy sheet with 1500mm in width and 8mm in thickness in this paper. The temperature field in the casting zone was solved by the software ANSYS. The effect of process factors, such as casting speed, pouring temperature and cooling intensity, on casting zone temperature of different process parameters were studied. Based on the solved temperature field, with the hot roll formula and test data of yield strength, the effect of casting speed, pouring temperature and cooling intensity on cast-rolling force in the cast-rolling zone was also dicussed. The results indicate that the casting speed has the greatest effect upon the temperature field and cast-rolling force, while the pouring temperature is the least. In addition, the value of critical cooling intensity increased with the increase of the casting speed. The quality defect called melt sheet or the leakage phenomenon appear when the cooling intensity is lower than the minimal critical cooling intensity value, and crack or rolling suspended appear if the cooling intensity is higher than the maximal critical cooling intensity value. When the casting speed are 1m/min, 2m/min and 3m/min, the minimal and maximal critical cooling intensity are 500, 1200, 2 000 W/(m2.K) and 2500, 5000, 7500 W/(m2.K) respectively.

Optimum Design and Analysis of Metal Delivery System for Magnesium Alloy Plates with Twin-Roll Casting Process

2013 ◽  
Vol 395-396 ◽  
pp. 1150-1153 ◽  
Author(s):  
Qun Yu ◽  
Xiao Dong Hu ◽  
Long Huan Huang ◽  
Yue Lin
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Delivery System ◽  
Physical Simulation ◽  
Casting Process ◽  
Simulation Method ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll ◽  
Metal Delivery

Using physical and numerical simulation method，metal delivery system of twin-roll casting magnesium alloy process was researched. The Anycasting software was used to simulate different flow systems by VOF method. And based on similar principles, an acrylic experimental model with the ratio of 1:1 was designed. The dam’s size and position were optimized by simulations and experiments. The flow distribution is uniform along the horizontal of the casting roller. Numerical simulation and physical simulation are in good coincidence.

Microstructures and Mechanical Properties of AZ31+Sr+Y Magnesium Alloy Sheets Produced by Twin-Roll Casting and Sequential Hot Rolling

2013 ◽  
Vol 765-767 ◽  
pp. 3176-3179 ◽  
Author(s):  
Yan Dong Yu ◽  
Qiong Hu ◽  
Peng Jiang
Keyword(s):  
Magnesium Alloy ◽  
Hot Rolling ◽  
Room Temperature ◽  
Dominant Role ◽  
Boundary Slip ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Deformation Properties ◽  
Increasing Temperature ◽  
Twin Roll

In this paper, the deformation properties of AZ31+Sr+Y magnesium alloy sheets produced by twin-roll casting (TRC) and sequential hot rolling were studied by the tensile testing at a strain rate of 7×10-4s-1and various temperatures: room temperature (RT), 200°C, 300°C and 400°C, respectively. The result shows that the microstructure of AZ31+Sr+Y alloy was refined obviously by adding elements Sr and Y, the elongation of the alloy increased with increasing temperature, and the fracture behavior of the alloy changed from brittle fracture to ductile fracture with increasing temperature. During the process of plastic deformation of AZ31+Sr+Y alloy, the twin plays a leading role at room temperature; the dislocation movement is regarded as the main deformation mechanism at 200° C; at the higher temperature (above 300°C) the grain boundary slip (GBS) plays a dominant role .

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