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The influence of printing strategies on the fatigue crack growth behaviour of an additively manufactured Ti6Al4V Grade 23 titanium alloy
Abstract
The selective laser melting (SLM) process, a type of laser powder-bed fusion (LPBF) in additive manufacturing (AM), uses a high-power density laser to melt metallic powders. This study involved 3D printing Compact Tension (CT) specimens from titanium alloy Ti6Al4V, known for its rigidity, corrosion resistance, and biocompatibility, making it suitable for aerospace and medical applications. To predict fatigue life, it is essential to assess fatigue crack growth rates (FCGR) in the presence of cracks. This investigation tested three printing strategies − transversal, longitudinal, and cross − under constant amplitude loading (R = 0.2) and compared the results with reference titanium alloys. Scanning electron microscopy (SEM) was used to analyze the fracture surfaces. The results indicated that the as-built AM transversal CT specimens (R = 0.2) had superior FCGR compared to the longitudinal and cross specimens, closely matching those of SLM-produced Ti6Al4V heat-treated at 670 °C (R = 0.05). The transverse deposition mode yielded the best performance, with fracture surfaces exhibiting mainly transgranular propagation. In addition, fracture surface topography measurements showed a strong correlation with fatigue life, particularly the relationship between the mean depth of furrows and the number of cycles to failure.
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Authors (7)
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Rui F. Martins
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Ricardo Branco
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José Camacho
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Zbigniew Marciniak
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António Silva
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Cândida Malça
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach dostępnych w wersji elektronicznej [także online]
- Published in:
-
INTERNATIONAL JOURNAL OF FATIGUE
ISSN: 0142-1123 - Language:
- English
- Publication year:
- 2025
- Bibliographic description:
- Martins R. F., Branco R., Camacho J., Macek W., Marciniak Z., Silva A., Malça C., The influence of printing strategies on the fatigue crack growth behaviour of an additively manufactured Ti6Al4V Grade 23 titanium alloy, INTERNATIONAL JOURNAL OF FATIGUE, 2025,10.1016/j.ijfatigue.2025.108942
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijfatigue.2025.108942
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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