Thermally activated dependence of fatigue behaviour of CrMnFeCoNi high entropy alloy fabricated by laser powder-bed fusion

Jin, Minsoo; Hosseini, E.; Holdsworth, S.R.; Pham, Minh‐Son

doi:10.1016/j.addma.2022.102600

Cited by 6 publications

(6 citation statements)

References 82 publications

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“…[215] Expectedly, the fatigue life improved upon improving the surface finish via machining. [214] Jin et al [216] further scrutinized the temperature dependence of fatigue behavior of the LPBF-fabricated CrMnFeCoNi HEA at strain rates of 10 À2 and 10 À3 s À1 , and strain amplitude of AE0.5%. Similar to their previous study at room temperature, [214] the initial short cyclic hardening was followed by cyclic softening for all the temperature levels.…”

Section: Strain-controlled Fatiguementioning

confidence: 99%

Section: Stress-controlled Fatiguementioning

confidence: 99%

“…[214] In another study, it was interesting to note that the crack propagation nature transitioned from trans-granular at 22-400 °C toward intergranular at 600 °C in the strain-controlled fatigue tests of the LPBF-fabricated CrMnFeCoNi HEA. [216] To observe the effect of precipitates on fatigue crack propagation, in situ TEM cyclic loading was performed for SLM-fabricated and aged (FeCoNi) 86 Al 7 Ti 7 . [100] Figure 21d,e depicts the TEM images of the specimen before and after tension-tension cyclic loading, respectively.…”

Section: Fatigue Crack Initiation and Propagation Behaviormentioning

confidence: 99%

“…Evolution of cellular structure with increasing temperature upon strain-controlled fatigue at a strain rate of 10 À3 s À1 for LPBF-fabricated CrMnFeCoNi HEA a) as-built state; After fatigue tests at temperatures of b) 22 °C, c) 200 °C, d) 400 °C, and e) 600 °C. Reproduced with permission [216]. Copyright 2022, Elsevier.…”

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confidence: 99%

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Deformation Behavior of 3D‐Printed High‐Entropy Alloys: A Critical Review

Bajaj,

Feng,

et al. 2023

Adv Eng Mater

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The 3D‐printing of high‐entropy alloys (HEAs) is capable of enhancing the design and manufacturing flexibilities for the novel materials. Owing to the rapid solidification, the 3D‐printed HEAs exhibit markedly different microstructures than their conventionally‐manufactured equivalents, leading to peculiar mechanical properties. Many additively‐manufactured HEAs also break down the strength‐ductility trade‐off dilemma. Novel dynamics regarding the simultaneous and sequential nature of deformation mechanisms are emerging through recent intensive research on these materials. Herein the deformation behavior of 3D‐printed HEAs is reviewed and explained on the basis of the latest advances in this area. A comprehensive picture regarding the role of cellular dislocation networks, twinning‐induced plasticity (TWIP), and transformation‐induced plasticity (TRIP) in the monotonic and cyclic deformation of 3D‐printed HEAs is presented. Special emphasis is placed on fatigue characteristics due to the enormous interest in this burgeoning area. The effect of post‐fabrication thermomechanical processing on plasticity is discussed along with the microstructural evolution in the 3D‐printed HEAs. Several innovative developments that carry latent potential for further research are also deliberated in this review. Finally, the present understanding of the deformation behavior of 3D‐printed HEAs is summarized while gauging the future directions.This article is protected by copyright. All rights reserved.

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Section: Strain-controlled Fatiguementioning

confidence: 99%

Section: Stress-controlled Fatiguementioning

confidence: 99%

Section: Fatigue Crack Initiation and Propagation Behaviormentioning

confidence: 99%

mentioning

confidence: 99%

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Deformation Behavior of 3D‐Printed High‐Entropy Alloys: A Critical Review

Bajaj,

Feng,

et al. 2023

Adv Eng Mater

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“…Like refractory HEAs and HEA superalloys, their future applications will target the high-temperature fields. So far, there are very few works investigating the fatigue behavior of HEAs at elevated temperatures (≤ 600 °C) [149,150]. Thus, future works on hightemperature fatigue behavior and fatigue-creep behavior, especially focusing on higher temperatures, of these HEAs needs to be considered as well.…”

Section: Other Future Workmentioning

confidence: 99%

Fatigue Behavior and Mechanisms of High-Entropy Alloys

Feng

Liaw

2022

High Entropy Alloys & Materials

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Fatigue failures of structural materials pose enormous risks to in-service structures, as well as human lives. The development of advanced durable structural materials with fatigue resistance has important social impact. The novel concept of high-entropy alloys (HEAs) has engendered considerable attention due to their exhibited unusual mechanical properties, and correspondingly opening a new road to design fatigue-resistant structural materials. The present work discusses and reviews the current findings on fatigue behavior and mechanisms of HEAs. Based on the understanding of fatigue-resistant favorable deformation mechanisms in HEAs, the perspectives from the viewpoint of materials design are provided to advance the development of fatigue-resistant HEAs, and future works are also suggested.

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Dislocation Distribution, Crystallographic Texture Evolution, and Plastic Inhomogeneity of Inconel 718 Fabricated by Laser Powder Bed Fusion

Al‐Lami,

Dessolier,

Rogers

et al. 2024

Adv Eng Mater

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Plastic inhomogeneity, particularly localised strain, is one of the main mechanisms responsible for failures in engineering alloys. This work studied the spatial arrangement and distribution of microstructure (including dislocations and grains) and their influence in the plastic inhomogeneity of Inconel 718 fabricated by additive manufacturing (AM). The bidirectional scanning strategy with no interlayer rotation resulted in highly ordered alternating arrangements of coarse Goss‐like {110}<001> textured grains separated by fine Cube‐like {100}<001> textured grains. The bidirectional strategy also resulted in an overall high density of geometrically necessary dislocations (GNDs) that were particularly dense in the fine grains. Although the Cube‐like texture desirable for isotropy was dominant, it gradually weakened during plastic deformation and the undesirable Goss‐like component (second most dominant in the as‐built microstructure) increased. The highly clustered and bimodal distribution of fine and coarse grains, textures and GND densities caused fast localised roughening during deformation, particularly along the line row of fine Cube‐like grains. However, the chessboard strategy resulted in a lower GND density and a comparatively more random distribution of crystallographic texture and GNDs, with a dominant Cube‐like component (and much lower Goss‐like texture) that remained stable throughout plastic deformation. This resulted in more uniform deformation, reducing plastic inhomogeneity.This article is protected by copyright. All rights reserved.

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Thermally activated dependence of fatigue behaviour of CrMnFeCoNi high entropy alloy fabricated by laser powder-bed fusion

Cited by 6 publications

References 82 publications

Deformation Behavior of 3D‐Printed High‐Entropy Alloys: A Critical Review

Deformation Behavior of 3D‐Printed High‐Entropy Alloys: A Critical Review

Fatigue Behavior and Mechanisms of High-Entropy Alloys

Dislocation Distribution, Crystallographic Texture Evolution, and Plastic Inhomogeneity of Inconel 718 Fabricated by Laser Powder Bed Fusion

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