scholarly journals Work-hardening behavior of commercially pure titanium JIS grade 1 sheet upon reverse loading

2016 ◽  
Author(s):  
Takayuki Hama ◽  
Ning Yi ◽  
Akihiro Kobuki ◽  
Sohei Uchida ◽  
Hitoshi Fujimoto ◽  
...  
Keyword(s):  
Work Hardening ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Work Hardening Behavior ◽  
Hardening Behavior ◽  
Commercially Pure ◽  
Reverse Loading

Effect of Orientation and Temperature on the Mechanical Properties of Commercially Pure Titanium

2006 ◽  
Vol 15-17 ◽  
pp. 941-946 ◽  
Author(s):  
Michael Battaini ◽  
Elena V. Pereloma ◽  
Chris H.J. Davies
Keyword(s):  
Low Temperature ◽  
Work Hardening ◽  
Pure Titanium ◽  
Rolling Texture ◽  
Quantitative Information ◽  
Electron Back Scatter Diffraction ◽  
Commercially Pure Titanium ◽  
Prism Slip ◽  
Commercially Pure ◽  
The Difference

This paper investigates the changes in deformation mechanisms of commercially pure titanium over a range of temperatures for different orientations relative to the initial rolling texture. Samples from grade 1 titanium plate were tested in plane strain compression (PSC). Extremes of orientation relative to the predominant split basal texture were tested at temperatures from 25°C to 700°C. Specimens were subsequently examined using X-ray texture analysis and electron back-scatter diffraction (EBSD). Changing the orientation resulted in substantial yield stress anisotropy. This was found to be largely related to the orientation of the dominant texture relative to the most favorable orientation for the easiest slip mode (prism slip), and significantly but to a lesser extent on differences in twinning behaviour. The most important difference in twinning was the operation of {1012} tensile twinning in c-axis tension and {1122} compression twinning in c-axis extension. Calculations indicated that at low temperature both of these twinning modes accommodate a significant amount of strain. Twinning was also found to be the most significant factor affecting work hardening behaviour, with reorientation hardening occurring for some sample orientations. As temperature was increased above ~350°C {1011} twinning became the dominant twinning mode, but its contribution to the strain was not as large as the low temperature twinning modes, and the total amount of twinning decreased with temperature. The decrease in twinning with increasing temperature led to a reduction in the difference in work hardening behaviour. The quantitative information gathered in the course of this work is discussed in the context of mechanical property prediction.

scholarly journals Work-hardening and twinning behaviors in a commercially pure titanium sheet under various loading paths

2015 ◽  
Vol 620 ◽  
pp. 390-398 ◽  
Author(s):  
Takayuki Hama ◽  
Hirotaka Nagao ◽  
Akihiro Kobuki ◽  
Hitoshi Fujimoto ◽  
Hirohiko Takuda
Keyword(s):  
Work Hardening ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Titanium Sheet ◽  
Loading Paths ◽  
Commercially Pure

Mechanical Properties of Commercially Pure Titanium during Hot Compression

2011 ◽  
Vol 189-193 ◽  
pp. 1799-1803 ◽  
Author(s):  
Yan Shu Zhang ◽  
Quan Lin Jin
Keyword(s):  
Work Hardening ◽  
Deformation Behaviour ◽  
Pure Titanium ◽  
Hot Compression ◽  
Commercially Pure Titanium ◽  
Hollomon Parameter ◽  
Commercially Pure ◽  
Work Hardening Rate ◽  
Grade Ii ◽  
Cp Ti

Commercially pure titanium (CP Ti), grade II, is subjected to hot compression at temperatures ranging from 673 to 973 K with 50 K intervals and strain rates of 0.001, 0.01, 0.1 and 1s-1 up to 60% height reduction. By analysing work hardening rate vs. flow stress, the deformation behaviour can be divided into three groups, viz. three-stage work hardening, two-stage work hardening and flow softening. By plotting the data in a T vs. logε diagram, the present and previous data fall into three distinct domains which can be separated by two distinct values of the Zener-Hollomon parameter.

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