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Journal of Engineering Materials and Technology | Volume 139 | Issue 3 | research-article
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
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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

Grahic Jump Location
Fig. 1

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

+The tensile test specimen dimensions (ASTM E8 Standard) (dimensions are in millimeter)
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The tensile test specimen dimensions (ASTM E8 Standard) (dimensions are in millimeter)
Grahic Jump Location
Fig. 2

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

+(a) U-shaped bending and (b) 60 deg V-shaped bending
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(a) U-shaped bending and (b) 60 deg V-shaped bending
Grahic Jump Location
Fig. 3

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

+Schematic representation of Erichsen test (a) and deep drawing cylindrical cup test(b)
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Schematic representation of Erichsen test (a) and deep drawing cylindrical cup test(b)
Grahic Jump Location
Fig. 4

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

+True stress versus true strain curves at 0.0083 s−1 for different inclination angles from rolling direction
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True stress versus true strain curves at 0.0083 s−1 for different inclination angles from rolling direction
Grahic Jump Location
Fig. 5

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

+True stress versus true strain curves at 0.041 s−1 for different inclination angles from rolling direction
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True stress versus true strain curves at 0.041 s−1 for different inclination angles from rolling direction
Grahic Jump Location
Fig. 6

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

+True stress versus true strain curves at 0.16 s−1 for different inclination angles from rolling direction
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True stress versus true strain curves at 0.16 s−1 for different inclination angles from rolling direction
Grahic Jump Location
Fig. 7

The effect of strain rate on the yield strength

+The effect of strain rate on the yield strength
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The effect of strain rate on the yield strength
Grahic Jump Location
Fig. 8

The effect of strain rate on the tensile strength

+The effect of strain rate on the tensile strength
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The effect of strain rate on the tensile strength
Grahic Jump Location
Fig. 9

The effect of strain rate on the uniform elongation

+The effect of strain rate on the uniform elongation
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The effect of strain rate on the uniform elongation
Grahic Jump Location
Fig. 10

The effect of strain rate on the total elongation

+The effect of strain rate on the total elongation
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The effect of strain rate on the total elongation
Grahic Jump Location
Fig. 11

Jump test of TWIP900CR steel

+Jump test of TWIP900CR steel
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Jump test of TWIP900CR steel
Grahic Jump Location
Fig. 12

Determinations of instantaneous and transient strain rate sensitivities

+Determinations of instantaneous and transient strain rate sensitivities
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Determinations of instantaneous and transient strain rate sensitivities
Grahic Jump Location
Fig. 13

Variations of instantaneous and total rate sensitivities with strain

+Variations of instantaneous and total rate sensitivities with strain
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Variations of instantaneous and total rate sensitivities with strain
Grahic Jump Location
Fig. 14

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

+Finite element modeling of (a) V-shaped die bending and (b) U-shaped die bending
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Finite element modeling of (a) V-shaped die bending and (b) U-shaped die bending
Grahic Jump Location
Fig. 15

Comparison of springback values

+Comparison of springback values
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Comparison of springback values
Grahic Jump Location
Fig. 16

Erichsen test results

+Erichsen test results
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Erichsen test results
Grahic Jump Location
Fig. 17

Deep drawing of a cylindrical cup at different conditions

+Deep drawing of a cylindrical cup at different conditions
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Deep drawing of a cylindrical cup at different conditions
Grahic Jump Location
Fig. 18

Adiabatic temperature increase versus strain rate

+Adiabatic temperature increase versus strain rate
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Adiabatic temperature increase versus strain rate

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