Bending fatigue behavior of biomedical Ti-6Al-4V alloy prepared by selective laser melting

WANG Qun; QU Yuntao; ZHANG Biao; ZHANG Yuxian; LI Rui; LI Ning; YAN Jiazhen

doi:10.12073/j.hjxb.20230421001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2024 > 45(4): 57-64. > DOI: 10.12073/j.hjxb.20230421001

WANG Qun, QU Yuntao, ZHANG Biao, ZHANG Yuxian, LI Rui, LI Ning, YAN Jiazhen. Bending fatigue behavior of biomedical Ti-6Al-4V alloy prepared by selective laser melting[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(4): 57-64. DOI: 10.12073/j.hjxb.20230421001

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Bending fatigue behavior of biomedical Ti-6Al-4V alloy prepared by selective laser melting

1.
College of Mechanical Engineering, Sichuan University, Chengdu, 610065, China
2.
Chengdu Keningda Material Co., Ltd., Chengdu, 610100, China

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Received Date: April 20, 2023
Available Online: February 29, 2024

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Abstract

Abstract

The bending fatigue behavior, the corresponding microstructure and fracture morphology of SLM Ti-6Al-4V alloy were studied. The rolled Ti-6Al-4V alloy with the same chemical composition as the SLM sample was set for comparative study. X-ray diffraction (XRD), scanning electron microscope (SEM) with electron backscatter diffraction (EBSD) were used to analyze the microstructure of the alloy. The results show that the three-point bending fatigue cracks initiate from stress concentration areas near the quasi-cleavage fracture surface, and then propagate inward.The bending fatigue life of SLM Ti-6Al-4V alloy was higher than that of rolled Ti-6Al-4V alloy. SLM Ti-6Al-4V internal hole defects led to stress concentration near the surface, resulting in fatigue crack nucleation. However, the random orientation α + β grains, secondary cracks, and holes in the SLM Ti-6Al-4V alloy delayed the crack propagation and improved fatigue life. As for rolled Ti-6Al-4V, the macrozone composed of a large number of α grains with approximate orientation caused the stress concentration and the formation of micro-cracks, which led to the nucleation of fatigue cracks. Moreover, the macrozone had little hindrance to crack propagation, which is not conducive to the fatigue life of materials.
- selective laser melting,
- Ti-6Al-4V alloy,
- microstructure,
- bending fatigue,
- crack propagation

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References

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Bending fatigue behavior of biomedical Ti-6Al-4V alloy prepared by selective laser melting