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Technical Briefs

Heat Treatment Selection and Forming Strategies for 6082 Aluminum Alloy

[+] Author and Article Information
Andrea Aginagalde

Mondragon University, Loramendi 4, Arrasate, Gipuzkoa 20500, Spainaaginagalde@eps.mondragon.edu

Xabier Gomez, Lander Galdos, Carlos García

Mondragon University, Loramendi 4, Arrasate, Gipuzkoa 20500, Spain

J. Eng. Mater. Technol 131(4), 044501 (Sep 09, 2009) (5 pages) doi:10.1115/1.3120384 History: Received May 12, 2008; Revised February 09, 2009; Published September 09, 2009

Abstract

Aluminum 6XXX alloys show high strength to weight ratios and are thus promising materials for today’s transport industry lightweight construction efforts. When considering both deformation and final mechanical properties, high ductility is interesting from the conformability point of view. On the other hand, high resistance is necessary in the automotive structural parts (which can be obtained through T6 precipitation heat treatment) but leads to reduced ductility. In order to increase aluminum alloys’ formability, warm forming is commonly applied. In contradiction to this, this article shows how the tensile deformation behavior of the 6082 T6 alloy is not affected by the temperature. In this work, the necessary formability values to obtain the parts are achieved, deforming the material under O annealed condition. But this strategy is focused on the formability perspective; therefore, the final mechanical properties do not achieve the necessary strength requirements. As a solution, the possibility of applying the T6 heat treatment after forming the parts (in annealed condition) is studied. A tensile characterization of the post-heat-treated specimens obtained from the deformed experimental part results in high flow stress levels, and thus, the strategy is validated. Nevertheless, the heat treatment leads to geometrical distortions in the final part, and thus, a last calibration step should be added to the forming process in order to obtain the desired shape.

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Figures

Figure 1

O annealing treatment temperature curve

Figure 2

T6 heat treatment temperature curve

Figure 3

Experimental die and equipment

Figure 4

Tensile specimen location in the final part

Figure 5

True stress-strain curves for alloy 6082 T6

Figure 6

True stress-strain curves for alloy 6082 O

Figure 7

State diagram of the material between temperatures of 200°C and 700°C up to 100% (up) and 0.8% (down) in mass.

Figure 8

AA 6082 T6 and AA6082 O alloy micrographs

Figure 9

Hardness results for samples obtained from the deformed part

Figure 10

Selected characteristic contour in the part

Figure 11

Geometrical distortions in the part

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