J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (4): 679-688.DOI: 10.1016/j.jmst.2017.07.015
Special Issue: Titanium Alloys 2018
• Orginal Article • Previous Articles Next Articles
Qinggang Meng, Chunguang Bai*(), Dongsheng Xu
Received:
2016-11-10
Revised:
2016-12-30
Accepted:
2017-03-01
Online:
2018-04-20
Published:
2018-05-04
Contact:
Bai Chunguang
Qinggang Meng, Chunguang Bai, Dongsheng Xu. Flow behavior and processing map for hot deformation of ATI425 titanium alloy[J]. J. Mater. Sci. Technol., 2018, 34(4): 679-688.
Al | V | Fe | O | C | H | Ti |
---|---|---|---|---|---|---|
4.06 | 2.54 | 1.49 | 0.25 | 0.014 | 0.008 | Bal. |
Table 1 Chemical composition of ATI425 titanium alloy (wt%).
Al | V | Fe | O | C | H | Ti |
---|---|---|---|---|---|---|
4.06 | 2.54 | 1.49 | 0.25 | 0.014 | 0.008 | Bal. |
Fig. 3. Relationship between the standard deviation of slopes of ln[sinh(ασ)]-lnε˙ curve at different temperatures and α values: (a) entire domain, (b) local domain.
Fig. 4. Relationship between fitted parameters and strain: (a) α, (b) n, (c) Q, (d) lnA. In literature [25], Samantaray et al. carried out the optimization of the selected α from 1000 numbers that were close to the suggested value from the ferrite steels [26,27]. Zhang et al. [16] viewed the parameter n as the slope of the linear regression lines, and found the proper α, which can minimize the standard deviation of n.
Fig. 9. Schematic representation of G, J, and Jmax. For constitutive equation of a strain rate sensitive material, the flow stress is usually expressed in the form of Backoken’s relation:
Fig. 15. Microstructures after compression at 900 °C at different strain rates: (a) 0.001 s-1, (b) 0.01 s-1, (c) 0.1 s-1, (d) 1 s-1. Power dissipation factor takes up the half percentage of all the input energy, and transforms for the drive supply of microstructure evolution, so the higher the power dissipation factor, the higher the microstructure evolution, which is proven from the experimental results.
Strain rate (s-1) | Recrystallization volume fraction |
---|---|
0.001 | 28.10% |
0.01 | 6.90% |
0.1 | 13.00% |
1 | 19.90% |
Table 2 Recrystallization volume fraction corresponding to 4 strain rates.
Strain rate (s-1) | Recrystallization volume fraction |
---|---|
0.001 | 28.10% |
0.01 | 6.90% |
0.1 | 13.00% |
1 | 19.90% |
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