Phase composition and fatigue crack growth behavior of Inconel 718 under additive manufacturing

Rashkovets, Mariia; Kislov, Nikita G.; Gushchina, Marina; Никулина, А. А.; Popelukh, Albert I.; Klimova-Korsmik, Olga

doi:10.1016/j.msea.2022.143595

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…This can be attributed to the γ" particle precipitates in the matrix during the aging heat treatment. Previous studies [48,49] have shown that γ" particle is beneficial for pinning dislocations to improve the strength of the alloy. Yu et al [50] found in their study of the fatigue behavior of IN 718 that the uniform distribution of γ' and γ" particles are conducive to providing greater maximum shear stress at the shear boundaries, promoting the formation of slip bands.…”

Section: Effect Of Secondary Phases On Fatigue Crack Propagationmentioning

confidence: 99%

The Effect of Dendritic Structure and Secondary Phases on the Fatigue Behavior of ERNiCrMo-3 Weld Metal

Zhang,

Ji,

et al. 2023

Preprint

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The effect of dendritic structure and secondary phases on the fatigue crack propagation mechanism of ERNiCrMo-3 weld metal was investigated in the present study. Element segregation in the weld metal caused severe lattice distortion in the interdendritic region, which led to the instability of crack propagation rates, resulting in considerable differences in mechanical properties between the dendrite core and interdendritic region. The limited plastic deformation capability of the interdendritic region caused the contraction of the local plastic deformation zone at the crack tip, which increased stress concentration and accelerated crack propagation. Meanwhile, element segregation promoted the precipitation of a large number of Laves pahse in the interdendritic region. The interaction between dislocations and Laves phase was enhanced as the stress increased, which generated micro-voids and provided fast channels for fatigue crack propagation. Post-weld heat treatment weakened the non-uniformity of the microstructure and the fatigue crack showed a stable propagation trend. Moreover, the dissolution of Laves phase and the precipitation of γ” enhanced the fatigue property of the weld metal.

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Section: Effect Of Secondary Phases On Fatigue Crack Propagationmentioning

confidence: 99%

The Effect of Dendritic Structure and Secondary Phases on the Fatigue Behavior of ERNiCrMo-3 Weld Metal

Zhang,

Ji,

et al. 2023

Preprint

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“…Rashkovets et al. [ 197 ] studied the FCG behavior and the change of phase composition in the IN718 superalloy manufactured via LDED. The microstructure of the as‐built sample contained NbC carbides, Fe 2 Ti Laves phase, and γ′ phase.…”

Section: Fatigue Performance Of Amed Metalsmentioning

confidence: 99%

“…The presence of these phases can change the morphology of the grain boundary and further modify the crack growth path. Rashkovets et al [197] studied the FCG behavior and the change of phase composition in the IN718 superalloy manufactured via LDED. The microstructure of the as-built sample contained NbC carbides, Fe 2 Ti Laves phase, and 𝛾′ phase.…”

Section: Fatigue Performancementioning

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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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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“…Для достижения этой цели логичным и целесообразным видится применение термической постобработки [6,7]. Жаропрочные сплавы на никелевой основе не являются исключением из этой тенденции [8][9][10][11]. В связи с тем, что они, как правило, обладают плохой обрабатываемостью резанием, необходимо решать вопросы, связанные с постобработкой: получением необходимой геометрии и шероховатости поверхности.…”

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Исследование Влияния Отжига На Микроструктуру И Твёрдость Сплава Эп648 После Прямого Лазерного Выращивания

Nosova¹,

Balyakin²,

Oleynik³

2023

Фундаментальные Проблемы Современного Материаловедения

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Методом прямого лазерного выращивания получены образцы из жаропрочного сплава на никелевой основе ЭП648. Проведён отжиг при температуре 1180 °С в течение 4 часов. Измерена твёрдость, выполнен оптический микроструктурный анализ, рентгенографический анализ. Установлено, что прямое лазерное выращивание образцов из сплава ЭП648 приводит к формированию структуры с сильным рефлексом в области угла интерференции 2θ=51°, который может принадлежать твёрдому раствора легирующих элементов в никеле, а также фазе Ni3Cr2. Наблюдаются пики в области углов интерференции 2θ<40°, которые могут принадлежать соединению Ni2Cr, частицы этой фазы слабо различимы на изображениях оптической металлографии. Проведение отжига в образах по указанному режиму приводит к повышению твёрдости от 19±4 HRC до 34±0,3 HRС. В результате проведения отжига происходит появление пиков в области угла интерференции 2θ=43° и 75°, что вероятно для твёрдого раствора на основе никеля и фазы Ni3Cr2. При этом сохраняется ГЦК решётка со значительным превышением периода решётки по сравнению с чистым никелем и присутствие фазы Ni2Cr. Положение и высота пиков на малых углах интерференции 2θ<40° не изменяется.

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Phase composition and fatigue crack growth behavior of Inconel 718 under additive manufacturing

Cited by 6 publications

References 25 publications

The Effect of Dendritic Structure and Secondary Phases on the Fatigue Behavior of ERNiCrMo-3 Weld Metal

The Effect of Dendritic Structure and Secondary Phases on the Fatigue Behavior of ERNiCrMo-3 Weld Metal

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

Исследование Влияния Отжига На Микроструктуру И Твёрдость Сплава Эп648 После Прямого Лазерного Выращивания

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