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Technical Briefs

Effects of Heat Treatment on Mechanical Property and Microstructure of Aluminum/Stainless Steel Bimetal Plate

[+] Author and Article Information
Weng-Sing Hwang1

Department of Materials Science and Engineering,  National Cheng Kung University, Tainan 70101, Taiwanwshwang@mail.ncku.edu.tw

Tian-I Wu, Wen-Chung Sung

Department of Materials Science and Engineering,  National Cheng Kung University, Tainan 70101, Taiwan

1

Corresponding author.

J. Eng. Mater. Technol 134(1), 014501 (Dec 08, 2011) (7 pages) doi:10.1115/1.4003107 History: Received January 20, 2010; Revised September 27, 2010; Published December 08, 2011; Online December 08, 2011

The effects of postrolling heat treatment on the mechanical property and microstructure of 1050 aluminum alloy and 304 stainless steel (SS) clad metals were investigated. Clad metals were made by cold rolling after surface treatments of both sheets followed by heat treatment at 500 °C for various annealing times. The effects of transformation of microstructure at the interface on bonding strength are discussed. The initial clad roll bonding of Al/stainless steel clad metal was bonded by mechanical locking at the interface. The protruding stainless steel in the interface is the diffusion route and forms the better joint with aluminum in the annealing process, which results in the enhancement of the bonding strength. Intermediate layers were formed for over 2 h. It resulted in the weakening of the bonding strength and the fracture surface transforms into a brittle structure. As Al/stainless steel clad metals were under 13% reduction ratio, it had the optimum bond strength with a heat treatment for 1 h at 500 °C.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

A schematic illustration of clad roll bonding process

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Figure 2

A schematic illustration of peel test and dimensions of the peel test sample

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Figure 3

Peeling strength versus crosshead displacement curves with annealing temperature of 500 °C and various annealing times

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Figure 4

Variation of break-off peel strength for various annealing times under the annealing temperature of 500 °C

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Figure 5

As-rolled Al/stainless steel clad metals for a reduction ratio of 13%: (a) Backscattered electron image of interface. ((b) and (c)) Fracture morphology of stainless steel-side and Al-side, respectively.

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Figure 6

Al/stainless steel clad metals heated at a temperature of 500 °C for 15 min: (a) The interfacial mapping image. ((b) and (c)) Fracture morphology of stainless steel-side and Al-side, respectively.

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Figure 7

Al/stainless steel clad metals heated at a temperature of 500 °C for 1 h: (a) Backscattered electron image of the interface. ((b) and (c)) Fracture morphology of stainless steel-side and Al-side, respectively.

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Figure 8

The backscattered electron image of Al/stainless steel clad metals heated at a temperature of 500 °C for 2 h. (a) Smooth region and (b) the protruding stainless steel region.

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Figure 9

Interface development of Al/stainless steel clad metals at different annealing conditions: (a) 500°C/3 h, (b) 500°C/4 h, and (c) 500°C/5 h

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Figure 10

The interfacial mapping image of the Al/stainless steel clad metal sintered at 500 °C for 3 h

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Figure 11

Al/stainless steel clad metals heated at a temperature of 500 °C for 6 h: (a) Backscattered electron image of the interface. (b) Wavelength-dispersive spectrometer study of the interface. ((c) and (d)) Fracture morphology of Al-side and SS-side, respectively.

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