J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (3): 409-417.DOI: 10.1016/j.jmst.2018.10.003
• Research Article • Previous Articles Next Articles
Jie Huanga, Kai-Ming Zhanga, Yun-Fei Jiaa, Cheng-Cheng Zhangc, Xian-Cheng Zhanga*(), Xian-Feng Mab*(), Shan-Tung Tua
Received:
2018-04-04
Revised:
2018-05-07
Accepted:
2018-05-09
Online:
2019-03-15
Published:
2019-01-18
Contact:
Zhang Xian-Cheng,Ma Xian-Feng
About author:
1 These authors contributed equally to this work.
Jie Huang, Kai-Ming Zhang, Yun-Fei Jia, Cheng-Cheng Zhang, Xian-Cheng Zhang, Xian-Feng Ma, Shan-Tung Tu. Effect of thermal annealing on the microstructure, mechanical properties and residual stress relaxation of pure titanium after deep rolling treatment[J]. J. Mater. Sci. Technol., 2019, 35(3): 409-417.
Elements | Ti | Fe | C | N | H | O |
---|---|---|---|---|---|---|
Content | Bal. | ≤0.20 | ≤0.08 | ≤0.03 | ≤0.015 | ≤0.18 |
Table 1 Chemical composition of pure Ti (wt%).
Elements | Ti | Fe | C | N | H | O |
---|---|---|---|---|---|---|
Content | Bal. | ≤0.20 | ≤0.08 | ≤0.03 | ≤0.015 | ≤0.18 |
Total vertical Feed (mm) | Single vertical Feed (mm) | Number of pass (time) | Horizontal feed speed (mm/min) |
---|---|---|---|
0.4 | 0.02 | 20 | 18 |
Table 2 Parameters of multi-overlap deep rolling.
Total vertical Feed (mm) | Single vertical Feed (mm) | Number of pass (time) | Horizontal feed speed (mm/min) |
---|---|---|---|
0.4 | 0.02 | 20 | 18 |
Item | Temperature (°C) | Duration (min) | |||
---|---|---|---|---|---|
OM | 250 | 10 | 20 | 40 | 80 |
400 | 10 | 20 | 40 | 80 | |
600 | 10 | 20 | 40 | - | |
Mechanical properties test | 200 | - | 20 | 40 | 80 |
400 | 10 | 20 | 40 | - | |
600 | 10 | 20 | 40 | - |
Table 3 The matrix of annealing treatments for deep rolled pure Ti.
Item | Temperature (°C) | Duration (min) | |||
---|---|---|---|---|---|
OM | 250 | 10 | 20 | 40 | 80 |
400 | 10 | 20 | 40 | 80 | |
600 | 10 | 20 | 40 | - | |
Mechanical properties test | 200 | - | 20 | 40 | 80 |
400 | 10 | 20 | 40 | - | |
600 | 10 | 20 | 40 | - |
Fig. 8. Tensile stress-strain curves of deep rolled pure Ti and subsequently annealed pure Ti at different temperatures: (a) 200?°C; (b) 400?°C; (c) 600?°C. (d) SEM micrographics of fracture surface.
Fig. 12. Residual stress distributions of deep rolled pure Ti with depth after annealing at: (a) 200?°C, (b) 250?°C, (c) 300?°C, (d) 400?°C, (e) 500?°C.
T (°C) | 200 | 250 | 300 | 400 | 500 |
---|---|---|---|---|---|
m ΔH (eV) | 1.995 (I) | 2.025 (I) | 0.075 | 0.097 | 0.064 |
0.192 (II) | 0.096 (II) | ||||
0.220 (I) | 2.778 | 2.399 | |||
2.760 (II) |
Table 4 Surface residual stress relaxation mechanism parameters of deep rolled pure Ti.
T (°C) | 200 | 250 | 300 | 400 | 500 |
---|---|---|---|---|---|
m ΔH (eV) | 1.995 (I) | 2.025 (I) | 0.075 | 0.097 | 0.064 |
0.192 (II) | 0.096 (II) | ||||
0.220 (I) | 2.778 | 2.399 | |||
2.760 (II) |
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