Effect of Planar Anisotropy and Tension-Compression Asymmetry of CP-Ti on its Deep Drawing Behavior at Room Temperature

Abstract:

The planar anisotropy (PA) and tension-compression asymmetry (TCA) of the commercially pure titanium (CP-Ti) were investigated through uniaxial tension and compression experiments at room temperature. By deep drawing experiment, the formability and the earing profile for the CP-Ti were studied at room temperature. The deep drawing simulations using the hardening rules of uniaxial tensile or compression curves were compared with experimental results. The results show that the CP-Ti has obvious PA, and the plastic strain ratios r₀, r₄₅ and r₉₀ are 1.47, 1.64 and 2.05, respectively. The CP-Ti sheet shows the tension-compression asymmetry of yielding and hardening. The TCA also shows obvious PA. The tension-compression yield strength ratio of 0°, 45° and 90° to the rolling direction are 1.12, 1.08, 1.04, and the tension-compression hardening exponent ratio are 0.86, 0.8 and 0.62, respectively. The simulative results without considering TCA indicate that the forming force, the wall thickness and earing profile are not in good agreement with the experimental ones. Therefore, the earing appeared in 45° is contribution of the PA and TCA. The TCA will reduce the thickness of the deep drawing parts, increase the earing ratio and affect the drawing force.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 190-195
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.190
• Online since: February 2018
• Authors: Yong Gang Hao, Peng Lin*, Bao You Zhang, Xiao Lei Cui, Chang Jiang Zhang, Cheng Zhong Chi
• Keywords: Cp-Ti, Deep Drawing, Planar Anisotropy, Tension-Compression Asymmetry

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