scholarly journals Effects of Nitrided Surface Layer and Microstructure on Press Formability in Commercially Pure Titanium Sheet Annealed in Nitrogen Gas Atmosphere

2017 ◽  
Vol 57 (6) ◽  
pp. 1062-1071 ◽  
Author(s):  
Kazuhiro Takahashi ◽  
Teruhiko Hayashi ◽  
Kohsaku Ushioda
Keyword(s):  
Surface Layer ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Nitrogen Gas ◽  
Titanium Sheet ◽  
Commercially Pure ◽  
Gas Atmosphere ◽  
Nitrided Surface ◽  
Press Formability

scholarly journals Time-dependent springback of a commercially pure titanium sheet

2017 ◽  
Vol 207 ◽  
pp. 263-268 ◽  
Author(s):  
Takayuki Hama ◽  
Takeyuki Sakai ◽  
Yusuke Fujisaki ◽  
Hitoshi Fujimoto ◽  
Hirohiko Takuda
Keyword(s):  
Pure Titanium ◽  
Time Dependent ◽  
Commercially Pure Titanium ◽  
Titanium Sheet ◽  
Commercially Pure

High Energy Shot Peening of Commercially Pure Titanium TIG Weld Joint

2010 ◽  
Vol 148-149 ◽  
pp. 659-663
Author(s):  
Chun Huan Chen ◽  
Rui Ming Ren
Keyword(s):  
Surface Layer ◽  
Weld Joint ◽  
Shot Peening ◽  
Welded Joint ◽  
Pure Titanium ◽  
High Energy ◽  
Commercially Pure Titanium ◽  
Nanostructured Surface ◽  
Commercially Pure ◽  
Cp Ti

Commercially pure Titanium (CP-Ti) TIG weld joint was treated by means of high energy shot peening (HESP) using a shot peening equipment commonly used in industry. The nanostructured surface layer was characterized by XRD, TEM, SEM and Microhardometer. The results showed that surface nanocrystallization of CP-Ti TIG weld joint were realized by high energy shot peening treatment. The finest grain size in the top surface layer is about 40nm. The hardness of the surface layer is enhanced significantly after shot peening compared with that of the as-welded joint, which resulted in a remarkable surface hardening effect. Surface welded defects such as air pores are eliminated successfully so that relative uniform surface layer was obtained.

Influence of Deformation Substructures on the Early Mechanisms of Recrystallization in Cold-Rolled Titanium and Zirconium

2005 ◽  
Vol 495-497 ◽  
pp. 711-718 ◽  
Author(s):  
N. Dewobroto ◽  
Nathalie Bozzolo ◽  
Francis Wagner
Keyword(s):  
Pure Titanium ◽  
Local Deformation ◽  
Commercially Pure Titanium ◽  
Titanium Sheet ◽  
Commercially Pure ◽  
Before And After ◽  
Nucleation Mechanisms ◽  
Grain Fragmentation ◽  
Cold Rolled ◽  
Short Times

The mechanisms governing the very first stage of static recrystallization in two hexagonal alloys (commercially pure titanium and low alloyed zirconium) are investigated in this paper. Initially fully recrystallized and equiaxed materials were cold-rolled to 80% thickness reduction and subsequently recrystallized at 500°C for short times. High resolution EBSD maps were acquired in a FEG-SEM before and after annealing in order to see where and how the new grains appear. Nonoriented nucleation mechanisms are involved in both materials, and there is a strong correlation between the local deformation substructures and the recrystallization kinetics. Recrystallization is extremely fast in the areas where the deformation cells are small and highly misoriented, i.e. in the areas which underwent severe grain fragmentation. Twinning plays an important role for that purpose in the studied titanium sheet.

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
Keyword(s):  
Grain Size ◽  
Cold Rolling ◽  
Microstructural Analysis ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Titanium Sheet ◽  
Cold Forming ◽  
Grain Sizes ◽  
Commercially Pure ◽  
Accumulated Strain

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.

Tool and lubrication for negative incremental forming of a commercially pure titanium sheet

2008 ◽  
Vol 203 (1-3) ◽  
pp. 193-201 ◽  
Author(s):  
G. Hussain ◽  
L. Gao ◽  
N. Hayat ◽  
Z. Cui ◽  
Y.C. Pang ◽  
...  
Keyword(s):  
Incremental Forming ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Titanium Sheet ◽  
Commercially Pure
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