Fatigue lifetime assessment and crack propagation of Ni-based VDM Alloy 699 XA produced by additive manufacturing

0582279 - ÚFM 2025 RIV NL eng C - Konferenční příspěvek (zahraniční konf.)
Vražina, Tomáš - Šulák, Ivo - Nowak, B. - Verma, B. - Krupp, U. - Kruml, Tomáš
Fatigue lifetime assessment and crack propagation of Ni-based VDM Alloy 699 XA produced by additive manufacturing.
Procedia Structural Intergrity. Vol. 52. Amsterdam: Elsevier, 2024 - (Aliabadi, M.; Khodaei, Z.), s. 43-51. ISSN 2452-3216.
[FDM 2023 - International Conference on Fracture, Damage and Structural Health Monitoring /21./. London (GB), 12.09.2023-14.09.2023]
GRANT EU: European Commission(XE) 958192 - HORIZON 2020
Institucionální podpora: RVO:68081723
Klíčová slova: Additive manufacturing * VDM 699 XA * Paris law * fatigue life performance * fatigue crack propagation
Obor OECD: Materials engineering

The present work focuses on the low-cycle fatigue (LCF) behavior of conventionally and additively manufactured (laser powder
bed fusion (LPBF) technique, Ni-based VDM Alloy 699 XA. LCF tests were performed on miniature cylindrical specimens in a
symmetrical push-pull cycle under strain control with a constant total strain amplitude at 23°C. Cyclic hardening/softening curves,
cyclic stress-strain curves, and fatigue life curves were obtained. Despite the present manufacturing defects associated with the
LPBF technology, the fatigue lifetime of the LPBF manufactured material is higher than that of conventionally prepared material.
Fatigue crack initiation sites and fatigue crack propagation areas were investigated by means of scanning electron microscopy
(SEM). A quantitative fractography of fracture surfaces was introduced to provide a detailed description of fatigue crack growth
from the evaluation of striation spacing. The dependency of the stress intensity factor range on macroscopic crack growth rates was
displayed in the form of the Paris Law. The differences in fatigue lifetimes and fatigue crack growth rates of additively
manufactured and hot rolled solution annealed alloy 699 XA plate material were discussed and correlated with respect to the
microstructural specifics of both material batches.
Trvalý link: https://hdl.handle.net/11104/0352917