Tailored microstructure by using in-situ re-scanning and its influence on fatigue crack growth behavior of Inconel 718 fabricated by LPBF at elevated temperature

Wang, M.S.; Xie, Dexin; Zhou, Kai; Xu, Jie; Jiang, Rong; Shen, Lida; Tian, Zongjun; Zhao, Jianfeng

doi:10.1016/j.ijfatigue.2023.107865

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…Fatigue crack propagation characterization is usually conducted on CT samples, [ 194 ] corresponding to the FCGR. [ 195 ] The FCG behavior is greatly influenced by the microstructure of nickel‐based superalloy processed using AM. Typically, heat treatment is an effective approach to change fatigue growth performance.…”

Section: Fatigue Performance Of Amed Metalsmentioning

confidence: 99%

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Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

Liu,

Yu,

Guo

et al. 2023

Advanced Materials

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Additive manufacturing (AM), which is a process of building objects in a layer‐upon‐layer fashion from designed models, has received unprecedented attention from research and industry because it offers outstanding merits of flexibility, customization, reduced buy‐to‐fly ratio, and cost‐effectiveness. However, the fatigue performance of safety‐critical industrial components fabricated by AM is still far below that obtained from conventional methods. This review discusses the microstructural heterogeneities, randomly dispersed defects, poor surface quality, and complex residual stress generated during the AM process that can negatively impact the fatigue performance of as‐printed parts. The difference in microstructural origin of fatigue failure between conventionally manufactured and printed metals is reviewed with particular attention to the effects of the trans‐scale microstructures on AM fatigue failure mechanisms. Various methods for mitigating the fatigue issue, including pre‐process, inter‐process and post‐process treatments, are illustrated. Empirical, semi‐empirical and microstructure‐sensitive models are presented to predict fatigue strength and lifetime. Summary and outlooks for future development of the fatigue performance of AM materials are provided.This article is protected by copyright. All rights reserved

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Section: Fatigue Performance Of Amed Metalsmentioning

confidence: 99%

“…Thus, the methods that can eliminate defects like HIP and process control improve FCG performance. [ 195 ]…”

Section: Fatigue Performance Of Amed Metalsmentioning

confidence: 99%

Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

Liu,

Yu,

Guo

et al. 2023

Advanced Materials

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Helical milling hole finishing of Inconel 718 parts manufactured by laser powder bed fusion

Pereira,

Pérez-Ruiz,

Gómez-Escudero

et al. 2024

Prog Addit Manuf

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Additive manufacturing through laser powder bed fusion (LPBF) has evolved into a key manufacturing process, but machining is still crucial to improve part quality. Holes in LPBF parts present poor accuracy, and helical milling with conventional endmills can be a suitable operation to finish holes in printed metal parts. Due to its superior properties, Inconel 718 is widely applied in aero-engine parts, requiring high reliability. However, Inconel 718 presents a tendency of machining hardening, being classified as a difficult-to-machine material. This work investigates the finishing through helical milling of holes in parts of Inconel 718 obtained through LPBF. LPBF parts of Inconel 718 were obtained with pre-holes and these were finished through helical milling. Holes of LPBF parts may present significant geometrical error. The results indicate that helical milling is suitable for improving the quality of LPBF holes. LPBF parts obtained with the laser scan angle of 67$$^{\circ }$$ ∘ with thermal treatment presented higher grain refinement and precipitates, resulting in the highest cutting forces and roughness. Cutting force patterns presented a significant correlation with geometrical error variation. Process modeling highlighted the most influential LPBF and helical milling parameters on cutting forces and roughness. The axial and tangential feeds presented directly and inversely proportional effects on cutting forces, respecting the kinematics and undeformed chip volumes. Finally, bi-objective optimization was performed to guide the choice of the best conditions to achieve improved roughness and lowest cutting forces.

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Interpenetrating microstructure in laser powder-bed fusion parts using selective rescanning

Ravichander,

Jagdale,

Kumar

2024

Additive Manufacturing Letters

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Tailored microstructure by using in-situ re-scanning and its influence on fatigue crack growth behavior of Inconel 718 fabricated by LPBF at elevated temperature

Cited by 5 publications

References 43 publications

Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

Helical milling hole finishing of Inconel 718 parts manufactured by laser powder bed fusion

Interpenetrating microstructure in laser powder-bed fusion parts using selective rescanning

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