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Research Papers

Evaluation of Formability Under Different Deformation Modes for TWIP900 Steel

[+] Author and Article Information
Suleyman Kilic

Department of Mechanical Engineering,
Ahi Evran University,
Kirsehir 40200, Turkey
e-mail: suleymankilic@ahievran.edu.tr

Fahrettin Ozturk

Department of Mechanical Engineering,
The Petroleum Institute,
P. O. Box 2533,
Abu Dhabi, UAE
e-mail: fahrettin71@gmail.com

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received January 9, 2016; final manuscript received December 5, 2016; published online March 23, 2017. Assoc. Editor: Marwan K. Khraisheh.

J. Eng. Mater. Technol 139(3), 031001 (Mar 23, 2017) (8 pages) Paper No: MATS-16-1008; doi: 10.1115/1.4035621 History: Received January 09, 2016; Revised December 05, 2016

Automotive manufacturers always seek high strength and high formability materials for automotive bodies. Advanced high strength steels (AHSS) are excellent candidates for this purpose. These steels generally show a reasonable degree of formability, in addition to their high strength. One particular type is the twinning-induced plasticity (TWIP) steel, which is a high manganese austenite steel, and represents a second generation in AHSS. In this study, comprehensive deformation analysis of TWIP900CR steel including tensile, bending, Erichsen, and deep drawing of cylindrical cups tests is made. Finite element simulation of U and V shaped bending processes is also performed. Results indicate that the TWIP steel has good mechanical properties and high formability. However, springback is quite significant. The coining force should be considered in order to reduce the amount of springback. For springback prediction, it is found that the Yld2000-2d material model has better prediction capability than the Hill48 model.

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References

Figures

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Fig. 1

The tensile test specimen dimensions (ASTM E8 Standard) (dimensions are in millimeter)

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Fig. 2

(a) U-shaped bending and (b) 60 deg V-shaped bending

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Fig. 3

Schematic representation of Erichsen test (a) and deep drawing cylindrical cup test(b)

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Fig. 4

True stress versus true strain curves at 0.0083 s−1 for different inclination angles from rolling direction

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Fig. 5

True stress versus true strain curves at 0.041 s−1 for different inclination angles from rolling direction

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Fig. 6

True stress versus true strain curves at 0.16 s−1 for different inclination angles from rolling direction

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Fig. 7

The effect of strain rate on the yield strength

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Fig. 8

The effect of strain rate on the tensile strength

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Fig. 9

The effect of strain rate on the uniform elongation

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Fig. 10

The effect of strain rate on the total elongation

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Fig. 11

Jump test of TWIP900CR steel

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Fig. 12

Determinations of instantaneous and transient strain rate sensitivities

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Fig. 13

Variations of instantaneous and total rate sensitivities with strain

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Fig. 14

Finite element modeling of (a) V-shaped die bending and (b) U-shaped die bending

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Fig. 15

Comparison of springback values

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Fig. 16

Erichsen test results

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Fig. 17

Deep drawing of a cylindrical cup at different conditions

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Fig. 18

Adiabatic temperature increase versus strain rate

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