High cycle fatigue behavior of a selective laser melted Ti6Al4V alloy: Anisotropy, defects effect and life prediction

Recent developments and future trends in fatigue life assessment of additively manufactured metals with particular emphasis on machine learning modeling

“…[189][190][191] Based on this consideration, the defect-based fracture mechanics methods have been successfully employed to predict the fatigue life of AM materials and achieved good results. 37,46,55,[191][192][193][194][195][196][197][198] Many fatigue crack propagation models have been adopted to predict the fatigue life of AM metals. A simply modified version of the Paris equation is as follows:…”

“…52,175,201 In addition, the small-crack theory was also utilized for the life prediction of L-PBF 316L 197 and SLM Ti-6Al-4V. 55 Due to the characteristics of AM metals, defect-based fracture mechanics method is widely used in fatigue life prediction. The fracture mechanics method based on damage failure mechanism has good physical significance and can describe the failure process of AM metals, such as small crack initiation, crack propagation, and coalescence.…”

“…However, the results of Sun et al, 54 Jiao et al, 55 and Gao et al, 56 also on SLM Ti‐6Al‐4V, showed that the fatigue performance of the H‐direction specimens was lower than that of the V‐direction specimens, and the reasons for this relationship in terms of fatigue life were, respectively, weaker bond between the layer interfaces, irregular defects in the jointing area of the “checkerboard,” and keyhole defects growing along the deposition direction.…”

Effect of stress‐relieved heat treatment on very high cycle fatigue performance of additive manufactured Ti‐6Al‐4V alloy

“…Ti‐6Al‐4V alloy plays a significant role in designing many structural components with complex geometries in aerospace, automotive, defense, transportation, and biomechanical industries that face VHCF 4,28–31 . The key objective of this paper is to investigate the impact of SR heat treatment on the microstructure and defect statistics and how these factors influence the VHCF behavior of L‐PBF Ti‐6Al‐4V parts.…”

“…Ti-6Al-4V alloy plays a significant role in designing many structural components with complex geometries in aerospace, automotive, defense, transportation, and biomechanical industries that face VHCF. 4,[28][29][30][31] The key objective of this paper is to investigate the impact of SR heat treatment on the microstructure and defect statistics and how these factors influence the VHCF behavior of L-PBF Ti-6Al-4V parts. This investigation is crucial for understanding the impact of SR heat treatment on VHCF fatigue performance of L-PBF Ti-6Al-4V components, providing valuable insights for optimizing VHCF performance in practical applications.…”