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| Strain hardening rate dependency of deformation shape, strain distribution, and contact pressure during wire flat rolling |
| Joong-Ki Hwang1 |
| 1 School of Mechatronics Engineering, Korea University of Technology and Education, Cheonan 31253, Republic of Korea |
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Abstract The effect of the strain hardening exponent (n) of a material on the changes in shape, strain inhomogeneity, and contact pressure was investigated during wire flat rolling to understand its effect on the deformation behavior of a flat-rolled wire and to determine the optimal working conditions with materials. The deformation behaviors of wires with various n values were systematically compared using finite element method. The shape of the deformed wire was found to depend on the n value of the material. Both the contact width and lateral spreading of the wire decrease with increasing n, resulting in a large reduction in area with the n value. The strain homogeneity of the wire increases with the n value of the wire. The improvement in the strain homogeneity with the n value is attributable to two factors: a lower strain concentration in the central region and a higher overall elongation as n increases. In addition, the average effective strain of the wire cross section decreases with the n value of a material during wire flat rolling. The contact pressure distribution on the surface of the wire differs significantly depending on the n value. In materials with a low n value, the contact pressure exhibits a higher value at the entry and edge zones of the contact surface. By contrast, materials with high n values exhibit a higher contact pressure at the exit zone. This behavior can be explained by the strain hardening behavior of the material during wire flat rolling.
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Joong-Ki Hwang. Strain hardening rate dependency of deformation shape, strain distribution, and contact pressure during wire flat rolling[J]. Journal of Iron and Steel Research International, 2023, 30(03): 475-486.
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2023, Vol. 30 
