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Research Papers

Effect of Cross Section Reduction on the Mechanical Properties of Aluminium Tubes Drawn With Variable Wall Thickness

[+] Author and Article Information
Q. H. Bui, R. Bihamta, M. Guillot

Aluminium Research Centre-REGAL,  Laval University, Quebec, G1V 0A6, Canada

A. Rahem

 National Research Council Canada, Aluminium Technology Centre, Saguenay, G7H 8C3, Canada

M. Fafard1

 Aluminium Research Centre-REGAL, Laval University, Quebec, G1V 0A6, CanadaMario.Fafard@gci.ulaval.ca

1

Corresponding author.

J. Manuf. Sci. Eng 133(6), 061004 (Nov 28, 2011) (10 pages) doi:10.1115/1.4005040 History: Received February 04, 2011; Revised August 31, 2011; Published November 28, 2011

Variable thickness tube drawing is a new process for the production of high performance tubes. In this study, experiments were conducted to evaluate the effect of cross section reduction on the microstructure and mechanical properties of variable thickness aluminium tubes drawn using two different position controlled mandrel techniques. Various tubes with three different outer diameters were subjected to cold drawing at room temperature from 11% to 41% cross section reduction. The local mechanical properties were determined from tensile tests carried out on specimens cut from different positions in the tubes parallel to their axes. The distributions of the Vickers hardness over the surfaces at 0 deg and 90 deg to the drawing direction were examined. It was found that the microhardness, yield strength, and ultimate tensile of the deformed samples increase and the corresponding elongation decreases with the increase of cross section reduction. Also, the anisotropy in microstructure and mechanical properties is more significant with increasing of cross section reduction. The evolution of mechanical properties of drawn tubes versus cross section reduction depends on the mandrel shapes and initial tube outer diameter. This study helps to further understand the microstructure and mechanical properties evolutions during tube drawing process with variable thickness.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

The illustration of variable wall thickness tube drawing using (a) a position controlled stepped mandrel and (b) position controlled conical mandrel [7]

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Figure 2

Photos and designs of (a) stepped mandrel; (b) conical mandrel with angle β = 1 deg; (c) conical mandrel with angle β = 5.02 deg, and (d) die with angle α = 10 deg

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Figure 3

(a) Schema of variable wall thickness tube; (b) preparation of specimens for optical microscopy and Vickers measurements: TD-RD (transverse direction-radial direction) and RD-DD (radial direction- drawing direction) samples; (c) tensile test specimen

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Figure 4

Polarized optical microstructure of AA 6063 tubes: (a, b) starting material (CSR = 0%), deformed samples at (c, d) CSR = 11.61%, (e, f) CSR = 17.46%, (g, h) CSR = 24.40%, (i, j) CSR = 31.40%, (k, l) CSR = 35.99% (50X magnification); (a, c, e, g, i, k) TD-RD samples; (b, d, f, h, j, l) DD-RD samples

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Figure 5

Grain size distribution after one pass of tube drawing: (a) starting material (CSR = 0%), deformed samples at (b) CSR = 11.61%, (c) CSR = 17.46%, (d) CSR = 24.40%, (e) CSR = 31.40%, and (f) CSR = 35.99%

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Figure 6

(a) Effect of CSR on the grain refinement of AA6063 tubes and (b) effect of CSR on the aspect ratio of AA6063 tubes

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Figure 7

Effect of CSR on the Vickers hardness changes

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Figure 8

True strain-stress curves showing the room temperature tensile behavior of drawn tubes

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Figure 9

Effect of CSR on (a) the yield strength, (b) UTS, (c) strain at UTS, and (d) elongation of the drawn tubes using stepped and conical mandrel

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Figure 10

Effect of CSR on (a) the yield strength, (b) UTS, (c) strain at UTS, and (d) elongation of the tubes drawn from three different initial tube outer diameters using conical mandrel with angle β = 5.02 deg

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Figure 11

Effect of CSR on the WoF of the drawn tubes using stepped and conical mandrel

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Figure 12

Effect of CSR on the WoF of the drawn tubes using conical mandrel for three different initial outer diameters

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