Warm redrawing of AA6082 sheets and investigations into the effect of aging heat treatment on cup wall strength

Panicker, Sudhy S.; Prasad, K. Sajun; Sawale, G.; Hazra, S. K.; Shollock, Barbara A.; Panda, Sushanta Kumar

doi:10.1016/j.msea.2019.138445

Cited by 12 publications

(4 citation statements)

References 47 publications

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“…The formability of the material increases with an increase in the forming temperature and is also affected by the microstructure, which changes according to the temperature at which the material is deformed [131][132][133]. In the case of austenitic stainless steel, martensite formation is not only affected by temperature, but also influenced by the rate at which the material is deformed [125].…”

Section: Warm/hot Formingmentioning

confidence: 99%

Forming Processes of Modern Metallic Materials

2020

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Section: Warm/hot Formingmentioning

confidence: 99%

Forming Processes of Modern Metallic Materials

2020

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“…Most of the studies on high temperature forming on the 7075-T6 alloy, consists in forming the sheets by carrying out heat treatments under the tools as for hardening steels [4,5]. Only a limited number of studies have examined the multi-stage warm forming of sheets to assess the improvement in formability of these aluminum alloys [6,7]. Additionally, it is crucial to preserve the T6 state of these alloys, which has been found to exhibit optimal performance.…”

Section: Introductionmentioning

confidence: 99%

Forming of a cylindrical cup in 7075-T6 under warm temperature conditions

Royne

Laurent

Maillard

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The high mechanical properties of aluminum alloys are very interesting for reducing the weight of parts in the automotive sector. However, a formability issue prevents the use of these alloys at room temperature especially for complex shapes where part failure occurs before full drawing. The use of a warm forming process, which consists of heating the part between 150°C and 250°C for aluminium alloys, allows to increase formability and therefore to perform complex shapes. In this study, the forming of a cylindrical cup in 7075-T6 is carried out at 200° C in two steps by two successive reductions in the diameter of the blank. Numerical simulations of these two forming steps are performed with Abaqus. The influence of friction coefficient is analysed in these two forming steps by comparing the evolutions of punch force.

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“…Nevertheless, limited works 10–12 had been reported on the investigations of elevated temperature redrawing behavior of aluminum sheet metals. Recently, Panicker et al 12 had experimentally demonstrated the improvement of nonisothermal warm redrawability of AA6082-O sheets for the first time. The same experimental approach was used in this work to evaluate the warm redrawability of another automotive grade sheet, AA5754-H22.…”

Section: Introductionmentioning

confidence: 99%

“…It was also demonstrated that the ring hoop tensile test (RHTT) is an easy and reliable technique to evaluate the redrawn cup wall strength by considering it tube-alike. 12 Such investigations are desirable as a component may be subjected to post-forming modifications, handling, installation, etc. and is expected to withstand either expansive forces from inside, compressive forces from outside, and/or crushing forces.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on the formability of AA5754 and AA6082 thin sheets in nonisothermal warm redrawing process

Panicker

Panda

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present work demonstrates a comparative investigation of the nonisothermal warm forward redrawing behavior of AA5754-H22 and AA6082-O sheets. The design and development of a new warm forward redrawing process was demonstrated. The complete redrawing was obtained by keeping the redrawing die and binder at 200 °C and cooling punch near to room temperature using water circulation. This process improved the thickness and surface strain distribution in redrawn cups without the onset of strain localization at the bottom corner. A thermomechanical finite element (FE) model of the nonisothermal warm redrawing process was developed applying the temperature-dependent Barlat-89 yield criterion and the Cowper–Symonds strain rate sensitive hardening model. The FE model reasonably predicted the part depth, earing development, thickness distribution, and surface strain evolution of the redrawn cups. The evolution of temperature distribution within the redrawing cup during the process was captured from FE simulations, and its role in the improvement in redrawing depth was demonstrated. Furthermore, the post-forming characterization of redrawn cup wall was also evaluated by microhardness and ring hoop tensile tests. It was found that the hardness, hoop tensile strength, and energy absorption capacity of AA5754-H22 cups were better than AA6082-O cups.

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Warm redrawing of AA6082 sheets and investigations into the effect of aging heat treatment on cup wall strength

Cited by 12 publications

References 47 publications

Forming Processes of Modern Metallic Materials

Forming Processes of Modern Metallic Materials

Forming of a cylindrical cup in 7075-T6 under warm temperature conditions

Experimental and numerical studies on the formability of AA5754 and AA6082 thin sheets in nonisothermal warm redrawing process

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