Effects of Rolling Reduction on Cold Forming Properties of Commercially Pure Titanium Sheet

2019 ◽  
Vol 960 ◽  
pp. 9-13
Author(s):  
Run Qi Zhang ◽  
Yi Qin Cai ◽  
Hao Xu Wang ◽  
Zhuang Li ◽  
Qi Zhou

Different cold rolling reductions were adopted for commercially pure titanium sheet. Cold forming properties were investigated by a microstructural analysis, Vickers microhardness and erichsen value measurements. The results have shown that Cold rolling resulted in refined alpha grains. Alpha grain size was refined further by greater cold reduction. Alpha grain sizes of the specimens of processing 1, 2 and 3 reached 30.90 μm, 26.48 μm and 20.58 μm, respectively. Cold forming properties were affected by different alpha grain sizes. The hardness and erichsen value reached the lowest and the highest values for the specimens in processing 1. The hardness increased and erichsen value decreased due to the finer alpha grain size for the specimen which was cold-rolled at a reduction of 50% in processing 2. Erichsen test results of the specimens of processing 3 had the lowest values due to the deformation of a reduction of 70%. Cold forming properties of the specimens of processing 3 were deteriorated, this is because deformation leads to the high dislocation density and the stored energy increases with accumulated strain after deformation.

2017 ◽  
Vol 896 ◽  
pp. 193-197
Author(s):  
Jin Yu Li ◽  
Zhuang Li ◽  
Wei Lv ◽  
Shao Pu Kang ◽  
Huan Huan Yu

Different cold rolling and recrystallization annealing of commercially pure titanium (CP-Ti) sheet was conducted. Microstructural evolution in commercially pure titanium sheet after cold forming and recrystallization annealing were investigated. Cold forming properties using a microstructural analysis, Vickers microhardness and erichsen value measurements were performed. Alpha grain sizes of processing 1 and 2 are 38.67μm and 40.12μm, respectively. Erichsen values of the specimens of processing 2 reaches the high value. This is attributed to recrystallization annealing. Equiaxed alpha grains are formed from the elongated grains and cold forming properties of CP-Ti were improved. The effect of the first recrystallization annealing was remained. Forming properties were a moderate value for processing 1 due to the presence of equiaxed grains.


2017 ◽  
Vol 207 ◽  
pp. 263-268 ◽  
Author(s):  
Takayuki Hama ◽  
Takeyuki Sakai ◽  
Yusuke Fujisaki ◽  
Hitoshi Fujimoto ◽  
Hirohiko Takuda

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