Numerical simulation of the effect of post-welding heat treatment on fatigue life of titanium alloy butt plate

Luo Jiayuan; Zhang Yuxiang; Lü Chenke

doi:10.7513/j.issn.1004-7638.2023.05.012

Volume 44 Issue 5

Oct. 2023

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Luo Jiayuan, Zhang Yuxiang, Lü Chenke. Numerical simulation of the effect of post-welding heat treatment on fatigue life of titanium alloy butt plate[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 76-83. doi: 10.7513/j.issn.1004-7638.2023.05.012

Citation:

Luo Jiayuan, Zhang Yuxiang, Lü Chenke. Numerical simulation of the effect of post-welding heat treatment on fatigue life of titanium alloy butt plate[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 76-83. doi: 10.7513/j.issn.1004-7638.2023.05.012

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Numerical simulation of the effect of post-welding heat treatment on fatigue life of titanium alloy butt plate

doi: 10.7513/j.issn.1004-7638.2023.05.012

School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing 400074, China

Received Date: 2022-12-18
Available Online: 2023-11-04
Publish Date: 2023-10-31

Abstract

Abstract

Based on the finite element software, a thermo-elastic-plastic finite element model of 30 mm thick TC4 titanium alloy butt plate considering the creep stress relaxation effect was established. The temperature field and stress field in the electron beam welding process of TC4 titanium alloy butt plate were simulated by this model, and the distribution of residual stress in the butt plate under three post-welding heat treatment processes was compared. The optimal post-welding heat treatment process is obtained. Fatigue analysis software fe-safe was used to analyze the influence of heat treatment on the fatigue properties of butt plate. The results show that the residual stress distribution obtained by numerical simulation is accurate. After 700 ℃×2 h post-welding heat treatment, the internal transverse and longitudinal residual stresses of the butt plate were completely eliminated, and the peak values are 28 MPa and 46.3 MPa, respectively. The creep effect plays an important role in the process of post-welding heat treatment to eliminate the residual stress, and the fatigue safety factor of welding seam and heat-affected zone of the butt plate can be increased from 0.192 to about 0.7.
- titanium alloy,
- post welding heat treatment,
- numerical simulation,
- combined heat source,
- residual stress,
- fatigue life

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References(14)

References

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