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Research Papers

Characterization of Plastic Anisotropy of AA5182-O Sheets During Prestraining and Subsequent Annealing

[+] Author and Article Information
Kaifeng Wang

Department of Industrial and Manufacturing
Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: kuw209@psu.edu

Bonan Zhou

Department of Mechanical Engineering,
University of Hawaii,
Honolulu, HI 96822
e-mail: zhou9891@gmail.com

Jingjing Li

Mem. ASME
Department of Industrial and Manufacturing
Engineering,
Pennsylvania State University,
University Park, PA 16802
e-mail: jul572@engr.psu.edu

John E. Carsley

General Motors Global Research and
Development Center,
Warren, MI 48092
e-mail: john.carsley@gm.com

Yang Li

Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: umliyang@umich.edu

1Corresponding author.

Manuscript received January 29, 2018; final manuscript received May 1, 2018; published online May 21, 2018. Assoc. Editor: Yannis Korkolis.

J. Manuf. Sci. Eng 140(8), 081004 (May 21, 2018) (12 pages) Paper No: MANU-18-1062; doi: 10.1115/1.4040157 History: Received January 29, 2018; Revised May 01, 2018

This paper described the effects of prestraining and annealing on plastic anisotropy (r-value) of aluminum alloy 5182-O sheets including two prestrain paths and two annealing conditions. During the prestraining and annealing processes, r-value changed depending on prestrain paths and annealing conditions. Although there were slight changes of the normal anisotropy coefficient, r¯, during prestraining and annealing processes, the planar anisotropy coefficient, Δr, increased significantly, especially for the uniaxial prestrain condition. This could accelerate the development of earing during a sheet forming operation. Also, the corresponding sheet textures in rolling direction (RD)/TD plane after prestraining and annealing processes were observed through electron backscatter diffraction (EBSD) analysis to explain the r-value changes, where the viscoplastic self-consistent (VPSC) model was used to correlate the determined texture to measured r-values. It is found that the sheet texture also had significant changes relating to the prestrain paths and annealing conditions resulting in varied r-values.

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Figures

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Fig. 3

(a) Select areas and point for r-value measurement and (b) evolutions of the corresponding r-values

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Fig. 2

Experimental setup for annealing and quenching

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Fig. 1

Schematic of specimen design for (a) prestrain in uniaxial tension along TD, (b) prestrain in equibiaxial tension, and (c) ASTM-E8 subsize tensile specimen for the r-value analysis: dimensions in millimeters

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Fig. 4

r-value evolution of as-received material in three tensile directions

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Fig. 5

Microstructures of as-received AA5182-O in three orthotropic planes based on EBSD analysis: (a) RD/TD plane, (b) RD/ND plane, and (c) TD/ND plane

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Fig. 6

(a) Grain distribution and (b) misorientation angle distribution of as-received material in three orthotropic planes

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Fig. 7

The determined ODFs of as-received material in the three orthotropic planes: (a) RD/TD plane, (b) RD/ND plane, and (c) TD/ND plane

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Fig. 8

Measured and predicted r-values of as-received material

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Fig. 9

Measured and predicted r-values of specimens prestrained along a uniaxial path including r-values of as-received material for reference

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Fig. 10

The ODFs of a uniaxial prestrained specimen in the RD/TD plane

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Fig. 11

Measured r-values of specimens prestrained along an equibiaxial path, and r-values of as-received material are included for reference

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Fig. 12

Grain size evolution under different prestraining and annealing conditions, where the prestrain level is 0.20 true strain and the annealing temperature is 350 °C

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Fig. 14

(a) Grain distribution and (b) misorientation angle distribution of prestrained and annealed specimens along different prestrain paths

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Fig. 15

Measured r-values under different prestraining and annealing conditions: uniaxial prestrain and anneal at 350 °C for (a) 10 s and (b) 20 min, and equibiaxial prestrain and anneal at 350 °C for (c) 10 s and (d) 20 min. r-values of as-received material are included for reference.

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Fig. 16

ODFs of prestrained specimens under different annealing conditions: uniaxial prestrain with annealing at 350 °C for (a) 10 s and (b) 20 min, and equibiaxial prestrain with annealing at 350 °C for (c) 10 s and (d) 20 min

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Fig. 17

Comparison between predicted and measured r-values of uniaxial prestrained and annealed specimens, where the annealing condition is 350 °C for 20 min

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Fig. 13

Microstructures of (a) uniaxial prestrained and annealed specimens and (b) equibiaxial prestrained and annealed specimens, where the annealing condition is 350 °C for 20 min

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