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- Title
Effects of build direction and microstructure on fatigue crack growth behavior of Ti6Al4V fabricated by laser powder bed fusion.
- Authors
Xie, Peidong; Xie, Deqiao; Zhou, Kai; Gu, Xuwen; Naqvi, Syed Mesum Raza; Shen, Lida; Tian, Zongjun; Zhao, Jianfeng
- Abstract
This study compares the fatigue crack growth (FCG) behavior of Ti6Al4V parts fabricated by laser powder bed melting (LPBF) with four build directions (0°, 30°, 60°, and 90°) and two heat treatments and analyzed the effect of build direction and microstructure on FCG. The results show that the build direction has a significant effect on the FCG rate. Particularly, specimens with 90° build direction have the best FCG resistance while the 0° specimens have the worst. Furthermore, the fragile deposition layer boundary is the main cause of the crack deflection. The microstructure shows that the columnar β grains have less effect on FCG. The increase in resistance to FCG after heat treatment is attributed to the lath‐like α grains consuming the energy for FCG. As compared to needle‐like α′ grains, the lath‐like α grains are more likely to initiate intergranular fracture and secondary cracking, leading to rugged crack tip paths. Highlights: The effect of build direction on FCG of LPBF‐Ti6Al4V part is significant.The heat‐treated lath‐like α grains have better resistance to FCG.Cracks tend to expand in the direction of parallel deposition layers.Secondary cracking is related to build direction and microstructure.
- Subjects
FATIGUE crack growth; MICROSTRUCTURE; BOUNDARY layer (Aerodynamics); LASERS
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2024, Vol 47, Issue 7, p2396
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.14312