Warm Temperature Deformation Behavior and Processing Maps of 5182 and 7075 Aluminum Alloy Sheets with Fine Grains

Jang, Dong Hwan; Kim, Woo Jin

doi:10.1007/s12540-018-0061-3

Cited by 16 publications

(5 citation statements)

References 20 publications

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“…The material used in the U draw bending tests was a commercial 5182 alloy sheet with a thickness of 1.1 mm that was supplied by the Novelis Aluminum Company (Yeongju, Gyeongsangbuk-do, Korea). The microstructure was composed of equiaxial grains (8.2 µm) with a high fraction of high angle grain boundaries (0.80) [18], indicating that the material had been fully recrystallized and has fine grains.…”

Section: Methodsmentioning

confidence: 99%

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A Springback Prediction Model for Warm Forming of Aluminum Alloy Sheets Using Tangential Stresses on a Cross-Section of Sheet

Kim

2018

Metals

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Warm U-draw bending tests were performed on a 5182 aluminum alloy under isothermal and non-isothermal conditions, and the amounts of springback under the corresponding conditions were measured. Finite element method analyses were then conducted to calculate the tangential stress distribution on the cross-section of the sheet during the warm forming process. It was found that the experimentally measured springback values were proportionally related to the differences in the amounts of tangential stresses at the top and bottom layers of the sheet section. A functional model that can account for the correlation between the amount of springback and the difference in tangential stresses at the top and bottom layers of the sheet section was derived based on an Euler beam and a nonlinear flow stress model with temperature and strain rate dependencies. The developed model, which can predict springback behavior using only results of forming analyses of warm formed aluminum alloy sheets, is anticipated to provide for advancements in the understanding of springback behavior at warm temperatures and improve the efficiency of design and analysis processes used to fabricate parts with complicated shapes by saving considerable time and costs for the analysis of springback.

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Section: Methodsmentioning

confidence: 99%

“…The tensile properties of 5182 alloy have been examined over wide ranges of strain rates (5 × 10 −4 to 1 × 10 −1 s −1 ) and temperatures (150-450 • C) in previous work [18]. In this work, additional tensile tests were conducted at lower temperatures of 25 and 100 • C at various strain rates.…”

Section: Uniaxial Tensile Testsmentioning

confidence: 99%

A Springback Prediction Model for Warm Forming of Aluminum Alloy Sheets Using Tangential Stresses on a Cross-Section of Sheet

Kim

2018

Metals

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“…This can be increased by forming at elevated temperatures [5]. Jang et al [6] studied the tensile deformation behavior of AA5182 aluminum alloy in the warm working temperature range of 150-350 • C and found that the drawability increased in warm deep drawing. Satish et al [7] also observed a significant effect of temperature and punch speed on formability of this alloy in the temperature range of 200-300 • C.…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Variables on Interface Friction Characteristics in Strip Drawing of AA 5182 Alloy and Its Formability in Warm Deep Drawing

Shrivastava,

Digavalli

2023

JMMP

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Warm forming is widely used to enhance the formability of aluminum alloy sheets. In warm deep drawing, the process variables significantly affect frictional characteristics at the tool–blank interface. It has been a conventional approach to use a constant value of friction coefficients in the finite element (FE) simulations. However, this can occasionally result in suboptimal accuracy of the predictions. In the present work, strip drawing tests were carried out on AA5182 aluminum alloy sheets to investigate the effect of important process variables, namely, temperature, contact pressure, and drawing speed, on the friction coefficient in the warm forming temperature range (100–250 °C) under lubricated condition. The results obtained from the strip drawing tests were used for defining the friction conditions in the simulation of warm deep drawing of cylindrical cups incorporating the variation of the friction coefficient with contact pressure and speed at different temperatures. The Barlat89 yield criterion was used to define the effect of anisotropy in the material. The Voce hardening law and Cowper–Symonds model were used to incorporate the effect of strain hardening and strain rate, respectively, in the simulation. Drawability and peak force were compared with the predictions when a constant friction coefficient was assumed. Warm deep drawing experiments were conducted to validate the predicted drawability and load–displacement curves. It is clearly observed that the accuracy of prediction of the limiting drawing ratio and peak load through simulations is improved by incorporating the effect of pressure and speed on friction coefficient as it captures the local variations of friction during warm deep drawing precisely, rather than assuming a constant average friction coefficient at all the tool–blank contact areas.

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“…Flow stress modelling and processing maps for different materials are widely used for selecting optimal parameters [18][19][20][21]. This approach was demonstrated for aluminium alloys over a wide range of strain rates and temperatures: 7075 [22], 6063 [23], 2014 [24], 5182 [25], 7085 [26], 5052 [27], and others. The models' parameters are strictly dependent on the chemical composition of the different types of Appl.…”

Section: Introductionmentioning

confidence: 99%

Flow Stress Modelling and 3D Processing Maps of Al4.5Zn4.5Mg1Cu0.12Zr Alloy with Different Scandium Contents

et al. 2021

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The hot deformation behaviour of an Al4.5Zn4.5Mg1Cu0.12Zr based alloy with 0.05, 0.1 and 0.15% Sc was investigated at temperatures between 300–450 °C and a strain rate of 0.1–15 s−1. The materials constants of a flow stress model based on the Zener-Hollomon parameter were determined (AARE was 5.8%). Three-dimensional processing maps were established by combining power dissipation efficiency and flow stability diagrams. Based on processing maps analysis and microstructures investigations, the optimal deformation parameters were determined as a temperature range of 350–400 °C and strain rates of 0.1–1 s−1 for the alloys with 0.05% and 0.1% Sc, and 0.1 s−1 for the alloy with 0.15% Sc.

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Warm Temperature Deformation Behavior and Processing Maps of 5182 and 7075 Aluminum Alloy Sheets with Fine Grains

Cited by 16 publications

References 20 publications

A Springback Prediction Model for Warm Forming of Aluminum Alloy Sheets Using Tangential Stresses on a Cross-Section of Sheet

A Springback Prediction Model for Warm Forming of Aluminum Alloy Sheets Using Tangential Stresses on a Cross-Section of Sheet

Effect of Process Variables on Interface Friction Characteristics in Strip Drawing of AA 5182 Alloy and Its Formability in Warm Deep Drawing

Flow Stress Modelling and 3D Processing Maps of Al4.5Zn4.5Mg1Cu0.12Zr Alloy with Different Scandium Contents

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