Microstructure tailoring and fatigue crack resistance in precipitation-strengthened TB9 titanium alloy

ZHANG Zhao; TENG Aijun; DONG Entao; MA Zhiwei; WANG Jiale; YUAN Zikai; GUO Jie; FANG Qiang

doi:10.7513/j.issn.1004-7638.2025.04.007

Volume 46 Issue 4

Aug. 2025

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ZHANG Zhao, TENG Aijun, DONG Entao, MA Zhiwei, WANG Jiale, YUAN Zikai, GUO Jie, FANG Qiang. Microstructure tailoring and fatigue crack resistance in precipitation-strengthened TB9 titanium alloy[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 52-58. doi: 10.7513/j.issn.1004-7638.2025.04.007

Citation:

ZHANG Zhao, TENG Aijun, DONG Entao, MA Zhiwei, WANG Jiale, YUAN Zikai, GUO Jie, FANG Qiang. Microstructure tailoring and fatigue crack resistance in precipitation-strengthened TB9 titanium alloy[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 52-58. doi: 10.7513/j.issn.1004-7638.2025.04.007

Citation:

ZHANG Zhao, TENG Aijun, DONG Entao, MA Zhiwei, WANG Jiale, YUAN Zikai, GUO Jie, FANG Qiang. Microstructure tailoring and fatigue crack resistance in precipitation-strengthened TB9 titanium alloy[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 52-58. doi: 10.7513/j.issn.1004-7638.2025.04.007

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Microstructure tailoring and fatigue crack resistance in precipitation-strengthened TB9 titanium alloy

doi: 10.7513/j.issn.1004-7638.2025.04.007

ZHANG Zhao^{1, 2
,
,},
TENG Aijun^{1, 2},
DONG Entao¹,
MA Zhiwei¹,
WANG Jiale¹,
YUAN Zikai¹,
GUO Jie¹,
FANG Qiang³

1.
Ansteel Beijing Research Institute Co., Ltd., Beijing 102200, China
2.
State Key Laboratory of Metal Materials for Marine Equipment and Application, Anshan 114009, Liaoning, China
3.
Chengdu Advanced Metal Materials Industrial Technology Institute Co., Ltd., Chengdu 610303, Sichuan, China

More Information

Received Date: 2024-11-20
Available Online: 2025-08-31
Publish Date: 2025-08-31

Abstract

Abstract

The effect of microstructure on mechanical properties in TB9 (Ti-3Al-8V-6Cr-4Mo-4Zr) titanium alloy subject to different heat-treatment processes had been investigated. The results show when the solid solution temperature increases from 800 ℃to 810 ℃, and β grain size in the obtained alloyed after complete heat treatment slightly increases, while tensile strength decreases significantly. When the solid solution process remains same, the occurrence of precipitates free zones can be observed within β grain after aging at 500 ℃ for 8 h. The distribution of α precipitates becomes homogeneous with prolonged aging time, and there is a peak-value of tensile strength at aging temperature of 500 ℃ for 16 h. Based on the microstructure observations, both heat treatment processes of 800 ℃-0.5 h, AC+500 ℃-16 h, AC and 810 ℃-0.5 h, AC+520 ℃-8 h, generate comparable microstructures, while the former process can achieve superior tensile and fatigue properties. Although roughness-induced crack closure effect is main fatigue crack resistance behavior in both alloys after different heat treatment processed, fatigue data normalized by tensile strength verifies that the size and distribution of α precipitates impact mechanical properties significantly.
- TB9 alloy,
- precipitation strengthening,
- fatigue properties,
- tensile strength,
- dislocation

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References(22)

References

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