Effects of Temperature and Forming Speed on Square Cup Drawability of AZ31 Magnesium Alloy Sheet

2013 ◽  
Vol 871 ◽  
pp. 211-214
Author(s):  
Takashi Katahira ◽  
Tetsuo Naka ◽  
Yasuhide Nakayama ◽  
Ryutaro Hino ◽  
Fusahito Yoshida
Keyword(s):  
Room Temperature ◽  
Fe Simulation ◽  
Alloy Sheet ◽  
Rate Dependent ◽  
Az31 Magnesium Alloy Sheet ◽  
Az31 Sheet ◽  
Effects Of Temperature ◽  
High Temperature Tensile ◽  
Cup Drawing ◽  
High Temperature Tensile Properties

Square cup drawing experiments were performed on an AZ31 sheet at various temperatures (T) ranging from room temperature to 200°C with three different punch travel speeds (V) of 3, 30 and 300mm/min. From the experiment, the highest drawability was observed either at T=175°C with V= 30mm/min or at T=200°C with V= 300mm/min. The effects of temperature and forming speed on the formability were discussed by comparing the result of drawing experiment with the high temperature tensile properties of the material. The forming limits were well predicted by FE simulation using a temperature and rate dependent constitutive model.

Springback Suppression of AZ31 Magnesium Alloy Sheet in Draw Bending at Elevated Temperature

2019 ◽  
Vol 794 ◽  
pp. 127-132
Author(s):  
Takashi Katahira ◽  
Takeshi Uemori ◽  
Tetsuya Yoshida ◽  
Michihiro Takiguchi ◽  
Tetsuo Naka ◽  
...  
Keyword(s):  
Shear Stress ◽  
Elevated Temperature ◽  
Room Temperature ◽  
Relaxation Effect ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet ◽  
Forming Condition ◽  
Effects Of Temperature ◽  
Draw Bending ◽  
Critical Resolved Shear Stress

In recent years, warm forming of magnesium sheets has been investigated by many researchers since the ductility of the sheets becomes considerably higher due to low CRSS (critical resolved shear stress) at high temperatures (e.g., [1]-[3]). In the present research, the springback of AZ31 magnesium sheet was investigated by performing a draw-bending experiment at several temperatures from 20 °C (room temperature) to 200 °C at drawing speeds ranging from 0.01 to 1.0 mm/s. From the experiment, it was found that the springback was remarkably reduced at 200 °C, especially at a low forming speed, since the flow stress was very low under such a forming condition, and furthermore, the stress relaxation effect was dominant. The effects of temperature and forming speed on springback were discussed.

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.

Die Parameters Optimized for Drawing of AZ31 Magnesium Alloy Sheet by Finite Element Method

2011 ◽  
Vol 480-481 ◽  
pp. 634-638
Author(s):  
Shao Feng Zeng ◽  
Wen Zhe Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Magnesium Alloy ◽  
Maximum Principal Stress ◽  
Alloy Sheet ◽  
Diameter Ratio ◽  
Az31 Magnesium Alloy Sheet ◽  
Az31 Sheet ◽  
Simulation Results ◽  
Element Method

In this study AZ31 sheet with a thickness of 1.2mm and diameter of 52mm was simulated to press into a dish by a finite element method(FEM) software, which to obtain better processing of plastics forming of magnesium alloy by varying die parameters. In order to find the way of development on drawing property and to formulate the rational stamping processing, simulations have been applied on the maximum principal stress various with round radius of dent die and round radius of punch and die gap. Simulation results show that: to obtain a dish of 29mm diameter, a sheet of AZ31 magnesium with a thickness of 1.2mm and diameter of 52mm has been drawn, the fracture occurring at the corner of dish wall bottom. the ability of drawing varies with the round radius of dent die, which better radius is 3.8 mm. In the same way better round radius of punch is 3.0 mm, while better half gap is 1.8mm. Experiments also show that high diameter ratio has been increased with the various of die parameters and forming ability of material has been developed. It is reliable of simulation of finite element method.

Analysis of Thickness Strain Prediction in Warm Deep Drawing of Ti-6Al-4V Alloy

2014 ◽  
Vol 980 ◽  
pp. 52-56
Author(s):  
Nitin Kotkunde ◽  
Aditya D. Deole ◽  
Amit Kumar Gupta ◽  
Swadesh Kumar Singh
Keyword(s):  
Deep Drawing ◽  
Room Temperature ◽  
Fe Simulation ◽  
Thickness Distribution ◽  
Austenitic Stainless Steels ◽  
Alloy Sheet ◽  
Fe Analysis ◽  
Yield Model ◽  
Thickness Strain ◽  
Good Agreement

In this work, deep drawing experiments have been performed in order to study formability of Ti-6Al-4V alloy sheet at temperature ranging from room temperature to 4000C. It is found that below 1500C, formability of the material is very poor and above 1500C till 4000C, limiting draw ratio (LDR) is found to be 1.8 which is substantially lesser than other structural alloys such as austenitic stainless steels. In order to understand qualitative aspects of formability, thickness distribution of drawn cup has been evaluated experimentally over a temperature range of 1500C - 4000C. Additionally, Finite Element (FE) analysis is done using a commercially available code Dynaform version 5.6.1 with LS-Dyna version 971 solver. 3-Parameter Barlat yield model is used for FE analysis. Predicted thickness distribution using FE simulation is in good agreement with experimental results.

scholarly journals Microstructural evolution and Mechanical Properties of a Newly Developed Ti2AlNb-based alloy

2020 ◽  
Vol 321 ◽  
pp. 11064
Author(s):  
Yongsheng HE ◽  
Wenzhong LUO ◽  
Yujun DU ◽  
Ming WU ◽  
Kaixuan Wang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Room Temperature ◽  
Phase Region ◽  
High Plasticity ◽  
Phase Zone ◽  
Creep Properties ◽  
Three Phase ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties

The effects of the microstructure on the tensile and creep properties of the alloy at room temperature and high temperature were investigated by controlling the microstructures of the alloy by different hot working processes. It is found that the lath microstructure obtained by forging in B2 single phase zone has high tensile strength. The tensile strength is 1188 MPa at room temperature and 950 MPa at high temperature. The equiaxed structure obtained by forging in O+B2 phase region has the characteristics of high plasticity, creep resistance and low tensile strength. The elongation at room temperature is 9.0%, and the elongation at high temperature is 36%. The ambient temperature, high temperature tensile properties of the dual microstructure obtained by forging in the three-phase zone of α2+O+B2 are between the lath and the equiaxed microstructure.

Study on Magnesium Alloy Thin Sheet by Symmetric Rolling and Asymmetric Rolling Process

2016 ◽  
Vol 725 ◽  
pp. 636-640
Author(s):  
Zhen Ming Wang ◽  
Hong Yang Zhao ◽  
Xiao Dong Hu ◽  
Yan Qing Lu ◽  
Dong Ying Ju
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Thin Sheet ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Asymmetric Rolling ◽  
Processing Property ◽  
Specific Strength ◽  
Az31 Magnesium Alloy Sheet ◽  
Grain Distribution

Magnesium alloy is honored as green engineering material for its low density, high specific strength, high specific rigidity, well cutting processing property, well electromagnetic shielding property, heat conduction and easy to recycle. In this paper, AZ31 Magnesium alloy sheet at difference thickness were prepared by symmetric and asymmetric rolling employed with six-roller mill. Microstructure of the two kinds of rolling magnesium alloy thin sheets at 0.5mm thickness were investigated. The grain distribution of AZ31magnesium alloy sheets made by asymmetry rolling at room temperature are more uniform than those made by symmetry process. The grains made by asymmetry are more tiny and the tensile strength and elongation increased obviously and the mechanical properties got better. At room temperature, value of n increased. Large value of n benefit to stamping forming. At room temperature, the value of LDR of asymmetry rolling sheets is 1.26, which was higher than symmetry rolling. So asymmetry rolling benefits to stamping forming.

Investigation into AZ31 Sheet Metal Deep Drawing Process at Elevated Temperature

2010 ◽  
Vol 154-155 ◽  
pp. 1244-1250
Author(s):  
Peng Cheng Wang ◽  
Pei Wu ◽  
Zhi Yong Yue
Keyword(s):  
Elevated Temperature ◽  
Magnesium Alloy ◽  
Sheet Metal ◽  
Deep Drawing ◽  
Elevated Temperatures ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet ◽  
Az31 Sheet

In this paper, mechanical properties of unidirectional hot tensile tests of 3mm thick AZ31 magnesium alloy sheet metal are researched at elevated temperatures and under different tensile speeds. In this basis, thermal deep drawing of cylinders tests for 3mm thick AZ31 magnesium alloy sheet are investigated at elevated drawing temperatures, different drawing speeds and so on. Thermal deep drawing performance showed that set pieces better when elevated temperature and drawing speed range are appropriate to deep drawing.

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