Evolution of Microstructure and Texture in AZ31 Alloy Subjected to Gas Forming

Kaya, Ali Arslan; Eren, D.; Turan, Dilek; Sorgente, Donato; Palumbo, G.

doi:10.1007/s11837-017-2350-6

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Before applying the gas pressure, the die and the blank holder were both heated to a temperature of 450 ºC by two ceramic band heaters. According to recent studies by Sorgente et al [5] and Kaya et al [6] this temperature represents a valuable compromise between the forming time, microstructure and formability. The 1.2 mm thick AZ31B sheet was then clamped between the die and the blank holder with a force enough to seal the chamber between the blank holder and the sheet.…”

Section: Methodsmentioning

confidence: 99%

On the Effect of the Complexity of the Constitutive Model in Simulating Superplastic Forming

Dai

Jarrar

Öztürk

et al. 2018

DDF

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Accurate constitutive material models are essential for the realistic simulation of metal forming processes. However, for superplastic forming (SPF), mostly the material models found in literature are based on the fitting of the simple power law equation. In this study an investigation was carried out on the effect of the complexity of the constitutive model on the accuracy of the SPF simulation results. This was achieved by following an experimental-numerical investigation of the SPF of the AZ31B magnesium alloy. High temperature bulge forming tests and microstructural analyses were carried out to generate the data required to fit two different constitutive models. The first is the simple power law. The second model takes into account grain growth and cavity formation in addition to the strain and strain rate hardening. The two models were then implemented in the simulation of SPF of a car-shaped geometry and the results were compared with those obtained from actual forming experiments. Results show that both models are capable of predicting the thickness distribution and the shape of the formed part to an acceptable degree. However, the more complicated model shows a better capability in predicting the forming time required to achieve the part geometry.

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Section: Methodsmentioning

confidence: 99%

On the Effect of the Complexity of the Constitutive Model in Simulating Superplastic Forming

Dai

Jarrar

Öztürk

et al. 2018

DDF

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show abstract

“…Before applying the gas pressure, the die and the blank holder were both heated to a temperature of 450 • C by a ceramic band heater. According to recent studies by Sorgente et al [12] and Kaya et al [13], this temperature represents a valuable compromise between forming times, microstructure and formability. The 1.2 mm thick AZ31B sheet was then clamped between the die and the blank holder with force enough to seal the chamber between the blank holder and the sheet.…”

Section: Mgmentioning

confidence: 99%

An Accurate Constitutive Model for AZ31B Magnesium Alloy during Superplastic Forming

Dai

Jarrar

Öztürk

et al. 2019

Metals

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Accurate constitutive material models are essential for the realistic simulation of metal forming processes. However, for superplastic forming, mostly the material models found in the literature are based on fitting of the simple power law equation. In this study, an AZ31B constitutive model that takes into account microstructural evolution is introduced. This model takes into account grain growth and cavity formation in addition to strain and strain rate hardening. The model parameters were calibrated using the results of high temperature bulge forming tests and microstructural analysis. The Taguchi optimization method was used in the fitting process. In order to verify the model, simulations of the superplastic forming of two different geometries were carried out, and the results were compared with those obtained experimentally. Results show that the proposed model can accurately predict the formed geometry and thickness distribution.

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“…Gas forming at elevated temperature, sometimes reported as hot metal gas forming, is one of the promising manufacturing processes for Mg alloys [2]. AZ31 alloy is among a limited number of commercialized magnesium alloys that has been largely adopted [3] and proved to have a very good formability between 400°C and 450°C [4]. Kim et al [5] reported that in the superplastic forming process, due to a significant grain coarsening of the AZ31 Mg alloy, a comparison between alloys with different initial grain sizes could be an effort in vane.…”

Section: Introductionmentioning

confidence: 99%

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

Sorgente

Palumbo

Fortunato

et al. 2018

MSF

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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.

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Evolution of Microstructure and Texture in AZ31 Alloy Subjected to Gas Forming

Cited by 5 publications

References 17 publications

On the Effect of the Complexity of the Constitutive Model in Simulating Superplastic Forming

On the Effect of the Complexity of the Constitutive Model in Simulating Superplastic Forming

An Accurate Constitutive Model for AZ31B Magnesium Alloy during Superplastic Forming

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

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