The Limiting Dome Height Tests and Formability of Magnesium Alloy Sheet AZ31B

2013 ◽  
Vol 302 ◽  
pp. 140-145 ◽  
Author(s):  
Xin Wu Ma ◽  
Fang Wang ◽  
Guo Qun Zhao
Keyword(s):  
Magnesium Alloy ◽  
Influence Factors ◽  
Sheet Thickness ◽  
Alloy Sheet ◽  
Experimental Results ◽  
Dome Height ◽  
Magnesium Alloy Sheet ◽  
Punch Speed ◽  
Forming Temperature

The assembly of the limiting dome height tests is developed to evaluate the formability of the magnesium alloy sheet AZ31B. The influence of forming conditions on the formability of AZ31B sheet is investigated by limiting dome height tests. The limiting bulging coefficient is used to represent the formability of AZ31B sheet in the tests. The sheet thickness, forming temperature, punch speed and lubrication are taken as influence factors in the tests. The experimental results show that the sheet of thickness 0.6mm has better formability and the proper forming temperature is about 200~250°C for AZ31B sheet. The low punch speed and good lubrication can also improve the formability of AZ31B sheet.

Tailor-Welded Blanks Manufactured and Stamping Properties of Magnesium Alloy

2010 ◽  
Vol 148-149 ◽  
pp. 241-244
Author(s):  
Zhong Tang Wang ◽  
Shi Hong Zhang ◽  
Guang Xia Qi ◽  
Rong Hui Chang
Keyword(s):  
Magnesium Alloy ◽  
Heat Affected Zone ◽  
Alloy Sheet ◽  
Experiment Study ◽  
Magnesium Alloy Sheet ◽  
Gas Tungsten Arc ◽  
Tailor Welded Blanks ◽  
Forming Temperature ◽  
Welding Properties ◽  
Welded Seam

Magnesium alloy tailor-welded blanks(MTWBs) of AZ31 and AZ80 sheet had been manufactured by gas tungsten arc welded(GTAW), which the thickness were 0.8mm. The welding properties of Magnesium alloy sheet had been analyzed, and the technology parameters of GTAW were determined by experiment study, which was that welding thread being Φ2.0mm, welding electricity 50A, welding voltage 9V, welding rate 12—13cm/min. The research results presented that the grain in welded seam was isometric crystal, and the grains were branching crystal in heat-affected zone (HAZ). For MTWBs of AZ31and AZ80 sheet which the thickness was 0.8mm, the forming parameters were that the forming temperature of AZ31 being 190-220°C, and forming temperature of AZ80 being 310°C-350°C, and the temperature of tools is 180°C~200°C.

Forming Behaviour at Elevated Temperature of a Laser Heat-Treated AZ31 Magnesium Alloy Sheet

2018 ◽  
Vol 941 ◽  
pp. 1270-1275
Author(s):  
Donato Sorgente ◽  
Gianfranco Palumbo ◽  
Alessandro Fortunato ◽  
Alessandro Ascari ◽  
Ali Arslan Kaya
Keyword(s):  
Magnesium Alloy ◽  
Heat Input ◽  
Elevated Temperatures ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Dome Height ◽  
Magnesium Alloy Sheet ◽  
Laser Heat ◽  
Az31 Magnesium Alloy Sheet ◽  
Forming Behaviour

The tailoring of mechanical and technological properties of the initial material in sheet metal forming has been widely investigated and successfully applied. The benefits of such an approach can be found in the improvement of both the post-forming performances of the manufactured component and the forming process capabilities. Different strategies can be found and most of them involve a microstructural alteration by a selective heat source (e.g. laser, induction, UV light). The use of aluminium alloys combined with these strategies has been extensively investigated, while magnesium alloys are almost not yet considered from this viewpoint. In this work, we investigated the effect of a selective laser heat treatment on an AZ31 magnesium alloy sheet. After laser heat treating a single track in the centre of a blank with different heat input values, bulge tests at elevated temperatures were conducted. The dome height evolution was continuously acquired during the tests and differences between the untreated specimen and the laser treated ones have been characterized. The effect of the laser treatment was evaluated also in terms of thickness distribution of the formed specimens. A thickness discontinuity was found along the treated specimens in the transition zone between the treated and the untreated material. Results highlighted that an effective change in the forming behaviour can be induced in the treated zone depending on the laser heat input. It has thus been shown that this approach can be employed for tailoring the magnesium alloy blank properties prior to the gas forming at elevated temperatures.

Study on Formability about ME20M Magnesium Alloy Sheet

2010 ◽  
Vol 136 ◽  
pp. 23-27
Author(s):  
Ting Fang Zhang ◽  
Shi Kun Xie
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Deep Drawing ◽  
Material Model ◽  
Alloy Sheet ◽  
Simulation Software ◽  
Constitutive Relationship ◽  
Magnesium Alloy Sheet ◽  
Forming Temperature ◽  
Made In

Warm forming of magnesium alloy sheet has attracted more and more attention in recent years. Mechanics tension test has been made in this paper in order to study the constitutive relationship of ME20M magnesium alloy sheet at different temperatures and strain rates. And a constitutive relationship which includes a softening factor has been put forward. Warm deep drawing experiment and numerical simulation on ME20M magnesium alloy sheet have been made in which the attention was focused on the forming temperature. The results showed that the limit deep drawing height of ME20M magnesium alloy sheet can be dramatically improved as the temperature goes up, especially when the temperature was over about 250°C. Simultaneity, it is feasible and effective to add a material model into numerical simulation software by user subroutine.

Numerical-Experimental Characterization of a Superplastic AZ31 Magnesium Alloy

2007 ◽  
Vol 551-552 ◽  
pp. 317-322 ◽  
Author(s):  
G. Palumbo ◽  
Donato Sorgente ◽  
Luigi Tricarico ◽  
S.H. Zhang ◽  
W.T. Zheng ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Biaxial Tension ◽  
Thickness Distribution ◽  
Alloy Sheet ◽  
Experimental Results ◽  
Az31 Magnesium Alloy ◽  
Dome Height ◽  
Fe Model ◽  
Flow Parameters ◽  
Hot Rolled

In this work the superplastic behaviour of a hot rolled AZ31 magnesium alloy sheet under a biaxial tension test with the blow forming technique is presented and reported. The specimen dome height and its thickness distribution, during and after the test, have been used as characterizing parameters. A numerical FE model of the test has been developed in order to easily characterize the material and to directly analyze experimental results. The influence of the rolling cycle on the microstructure and consequently on the material behaviour has been also analyzed. A synergic use of experimental results and of the numerical model has been done for finding material constants in different situations. The material flow parameters have been found and results are presented.

Research on the Warm Deep Drawing of AZ31 Magnesium Alloy Sheet Based on DYNAFORM

2011 ◽  
Vol 138-139 ◽  
pp. 754-758
Author(s):  
X.Q. Cao ◽  
J.W. Wang ◽  
Y. Liu ◽  
Cheng Zhong Chi ◽  
L.C. Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Deep Drawing ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet ◽  
Different Temperatures ◽  
Forming Temperature ◽  
Simulation Results

The effect of forming temperature on the deep drawability (limit drawing ratio (LDR)) of AZ31 magnesium alloy sheet was studied both numerically and experimentally by the use of finite element analysis software DYNAFORM and specially designed warm deep drawing die set. The simulation model was built by SolidWorks 2009, 3-Parameter_Barlat model with BT shell unit was adopted as material model. The constitutive relation of the material was provided by uniaxial isothermal tension tests at different temperatures. After being set, all parameters were referred to famous explicit dynamic solver LS-DYNA. The simulation results showed that the LDR of the AZ31 magnesium alloy sheet is increased with the increase of the temperature initially, but after the temperature reached 423K, the LDR reached the maximum, and then decrease with the increase of temperature in the temperature range studied (room temperature-673K). PTEF was used as lubricant in the experiment. Experimental results showed same trend as numerical simulation results in the studied range of temperature, and LDR reached the maximum of 3.0 at 423K. It is shown that the results of numerical simulation have a good agreement with that of the experiment. By analyzing the microstructure of the drawn-cup walls at different temperatures, it is found that grains were stretched along the direction of tension at temperatures lower than 423K. And there appeared a large number of fine recrystallized grains when forming temperature is 423K showing that dynamic recrystallization occurred during forming process. Dynamic recrystallization conducted completely when forming temperature increased higher than 423K, but the material softening would aggravate with the increase of temperature and on the contrary would do harm to the deep drawing of AZ31 magnesium alloy sheet, resulting the decrease of LDR.

Effects of strain rate, temperature and sheet thickness on yield locus of AZ31 magnesium alloy sheet

2008 ◽  
Vol 201 (1-3) ◽  
pp. 395-400 ◽  
Author(s):  
Tetsuo Naka ◽  
Takeshi Uemori ◽  
Ryutaro Hino ◽  
Masahide Kohzu ◽  
Kenji Higashi ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Sheet Thickness ◽  
Alloy Sheet ◽  
Yield Locus ◽  
Az31 Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet

An Experimental Study on Superplastic Behaviors of Magnesium Alloy Sheet

2005 ◽  
Vol 475-479 ◽  
pp. 2913-2918 ◽  
Author(s):  
Quan Lin Jin ◽  
Huiying Wu
Keyword(s):  
Experimental Study ◽  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Grain Refinement ◽  
Superplastic Forming ◽  
Alloy Sheet ◽  
Experimental Results ◽  
The Maximum Principle ◽  
Magnesium Alloy Sheet ◽  
Influence Of Temperature On

An experimental study on superplastic forming behaviors and microstructure characters of commercial magnesium alloy sheet AZ31B is presented in this paper. The main experimental results show that the commercial magnesium alloy AZ31B sheet has superplastic capability. For the received sheet without any pre-processing, the maximum elongation is 295%. The dynamic recrystallization and grain refinement can be found, In the case of temperature <350°C, and the grain growth appears if temperature ≥ 350°C. The superplastic behaviors can be improved by controlling the dynamic recrystallization and grain refinement. Some experimental results of free superplastic bulging are presented in this paper. The results show that influence of temperature on forming capability is much less than the influences of temperature on elongation. In addition, the maximum principle strain

Formability Analysis on Superplastic Forming of AZ91 Magnesium Alloy Sheet

2018 ◽  
Vol 385 ◽  
pp. 437-442
Author(s):  
G. Kumaresan ◽  
K. Kalaichelvan
Keyword(s):  
Magnesium Alloy ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Thermomechanical Processing ◽  
Sheet Thickness ◽  
Superplastic Forming ◽  
Alloy Sheet ◽  
Az91 Magnesium Alloy ◽  
Forming Temperature

Superplastic sheet metal forming allows the production of complex parts that are not formable under normal conditions. Superplastic sheet metal forming processes are normally based on the same common principle: the sheet metal is firmly clamped between the die halves and is blow-formed by means of gas pressure. Generally superplastic forming can only be achieved in a very narrow range of strain rates and temperature. Superplastic materials are relatively stable when deformed; this behavior is related to the observation that the flow stress of a superplastic material is very sensitive to the rate of deformation. This paper aims to study the formability characteristic of Magnesium alloy by considering variable parameters, such as the sheet thickness, forming pressure and forming temperature. The forming time of 120 minutes is constant for the formability test. Keywards: Multi dome test, superplasticity, Mg – alloy, Thermomechanical processing, Formability.

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