Deformation and Heat Transfer Analysis for High Speed Dieless Drawing of AZ31 Magnesium Alloy Tubes

2011 ◽  
Vol 418-420 ◽  
pp. 1036-1039 ◽  
Author(s):  
Tsuyoshi Furushima ◽  
Takuma Ikeda ◽  
Kenichi Manabe
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Deformation Zone ◽  
High Speed ◽  
Numerical Approach ◽  
Az31 Magnesium Alloy ◽  
Heat Transfer Analysis ◽  
Dieless Drawing ◽  
Rate Of Increase ◽  
Feeding Speed

The effect of drawing speed and heating length on deformation behavior was investigated by numerical approach for AZ31 magnesium alloy tubes to realize high speed dieless drawing process. The length of deformation zone expands with increasing the feeding speed. The increase in heating length leads to expanding length of deformation zone. The mean strain rate increases with increasing the feeding speed firstly, and then rate of increase in the strain rate becomes gradual under condition of any length of heating band. Based on these results, a limiting reduction in area of 52.5% under higher speed and larger heating length conditions can be realized experimentally.

High-Speed Rolling of AZ31 Magnesium Alloy Having Different Initial Textures

2014 ◽  
Vol 24 (2) ◽  
pp. 972-985 ◽  
Author(s):  
Yusuke Onuki ◽  
Kenichiro Hara ◽  
Hiroshi Utsunomiya ◽  
Jerzy A. Szpunar
Keyword(s):  
Magnesium Alloy ◽  
High Speed ◽  
Az31 Magnesium Alloy

Texture of AZ31 Magnesium Alloy Sheet Heavily Rolled by High Speed Warm Rolling

2007 ◽  
Vol 539-543 ◽  
pp. 3359-3364 ◽  
Author(s):  
Tetsuo Sakai ◽  
Hiroshi Utsunomiya ◽  
H. Koh ◽  
S. Minamiguchi
Keyword(s):  
Magnesium Alloy ◽  
High Speed ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Rolling Temperature ◽  
Az31 Magnesium Alloy ◽  
Basal Texture ◽  
Double Peak ◽  
Magnesium Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet

Magnesium alloy sheets had to be rolled at elevated temperature to avoid cracking. The poor workability of magnesium alloy is ascribed to its hcp crystallography and insufficient activation of independent slip systems. Present authors have succeeded in 1-pass heavy rolling of AZ31 magnesium alloy sheet below 473K by raising rolling speed above 1000m/min. Heavy reduction larger than 60% can be applied by 1-pass high speed rolling even at room temperature. The improvement of workability at lower rolling temperature is due to temperature rise by plastic working. The texture of heavily rolled AZ31 magnesium alloy sheet is investigated in the present study. The texture of sheets rolled 60% at room temperature was <0001>//ND basal texture. At the rolling temperature above 373K, the peak of (0001) pole tilted ±10-15 deg toward RD direction around TD axisto form a double peak texture. The texture varied through thickness. At the surface, the (0001) peak tilted ±10-15 deg toward TD direction around RD axis to form a TD-split double peak texture. The direction of (0001) peak splitting rotated 90 deg from the surface to the center of thickness. Heavily rolled magnesium alloy sheets have non-basal texture. The sheets having non-basal texture are expected to show better ductility than sheets with basal texture.

Effect of Stress State in Rolling Deformation Zone of AZ31 Magnesium Alloy Plate on Edge Cracking

2020 ◽  
Vol 29 (6) ◽  
pp. 3906-3912
Author(s):  
Zhiquan Huang ◽  
Chuanlu Qi ◽  
Guowei Yang ◽  
Hongyu Lai ◽  
Yanchun Zhu ◽  
...  
Keyword(s):  
Stress State ◽  
Magnesium Alloy ◽  
Deformation Zone ◽  
Az31 Magnesium Alloy ◽  
Alloy Plate ◽  
Edge Cracking ◽  
Rolling Deformation

Improvement of Low Temperature Formability of AZ31 Magnesium Alloy by High Speed Rolling

2015 ◽  
pp. 209-217
Author(s):  
Jing Su ◽  
Abu Syed H. Kabir ◽  
Mehdi Sanjari ◽  
In-ho Jung ◽  
Steve Yue
Keyword(s):  
Magnesium Alloy ◽  
Low Temperature ◽  
High Speed ◽  
Az31 Magnesium Alloy

Research on Flow Stress of Magnesium Alloy Sheet under Warm and High Strain Rate Forming Condition

2011 ◽  
Vol 189-193 ◽  
pp. 2522-2525
Author(s):  
Zheng Hua Meng ◽  
Shang Yu Huang ◽  
Jian Hua Hu
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
Process Simulation ◽  
High Strain ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Rate Condition ◽  
Magnesium Alloy Sheet

Process simulation is a powerful tool to predict material behaviors under specified deformation conditions, so as to optimize the processing parameters. The equation for flow stress is important to numerically analyze. However, the reported constitutive equations of magnesium alloy are only suitable for processing simulation with strain rate between 0.001-1s-1. In this paper, the strain-stress behavior of AZ31 under warm and high strain rate (>103s-1) condition has been investigated by split Hopkinson pressure bar experiments at elevated temperature. The results show that the influence of the temperature on flow stress is more obvious than that of strain rate; the flow stress decreases with the rise of temperature at a certain strain rate. Based on Johnson-Cook model, the constitutive equation of AZ31 magnesium alloy under warm and high strain rate condition has been given out by fitting the experimental data, which can be applied in process simulation of AZ31 magnesium alloy sheet forming.

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