Correlation between microstructure heterogeneity and multi-scale mechanical behavior of hybrid LPBF-DED Inconel 625

Martin, Noémie; Hor, Anis; Copin, Étienne; Lours, Philippe; Ratsifandrihana, Léon

doi:10.1016/j.jmatprotec.2022.117542

Cited by 25 publications

(4 citation statements)

References 25 publications

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Section: Comparison Of Microstructural Properties In Am and CM Processesmentioning

confidence: 99%

“…It has a multi-scale non-homogeneous microstructure with columnar grains; however, the characteristic sizes exceed those in LPBF [196,197]. It leads to surface hardness and mechanical strength values that are lower than those of parts made using LPBF, but they are higher than identical parts made of wrought alloys [198]. In addition to the dependence on processing parameters, the grains observed in DED also vary with the specimen's geometry and locations within it [196,199].…”

Section: Comparison Of Microstructural Properties In Am and CM Processesmentioning

confidence: 99%

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Negative Thermal Expansion Metamaterials: A Review of Design, Fabrication, and Applications

Dubey,

Mirhakimi,

Elbestawi

2024

JMMP

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Most materials conventionally found in nature expand with an increase in temperature. In actual systems and assemblies like precision instruments, this can cause thermal distortions which can be difficult to handle. Materials with a tendency to shrink with an increase in temperature can be used alongside conventional materials to restrict the overall dimensional change of structures. Such structures, also called negative-thermal-expansion materials, could be crucial in applications like electronics, biomedicine, aerospace components, etc., which undergo high changes in temperature. This can be achieved using mechanically engineered materials, also called negative thermal expansion (NTE) mechanical metamaterials. Mechanical metamaterials are mechanically architected materials with novel properties that are rare in naturally occurring materials. NTE metamaterials utilize their artificially engineered architecture to attain the rare property of negative thermal expansion. The emergence of additive manufacturing has enabled the feasible production of their intricate architectures. Industrial processes such as laser powder bed fusion and direct energy deposition, both utilized in metal additive manufacturing, have proven successful in creating complex structures like lattice formations and multimaterial components in the industrial sector, rendering them suitable for manufacturing NTE structures. Nevertheless, this review examines a range of fabrication methods, encompassing both additive and traditional techniques, and explores the diverse materials used in the process. Despite NTE metamaterials being a prominent field of research, a comprehensive review of these architected materials is missing in the literature. This article aims to bridge this gap by providing a state-of-the-art review of these metamaterials, encompassing their design, fabrication, and cutting-edge applications.

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Section: Comparison Of Microstructural Properties In Am and CM Processesmentioning

confidence: 99%

Section: Comparison Of Microstructural Properties In Am and CM Processesmentioning

confidence: 99%

Negative Thermal Expansion Metamaterials: A Review of Design, Fabrication, and Applications

Dubey,

Mirhakimi,

Elbestawi

2024

JMMP

View full text Add to dashboard Cite

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“…Several comparisons between L-PBF and L-DED exist, mainly discussing hybrid manufacturing methods and concluding that the scale of microstructure is smaller in L-PBF than in L-DED [ 12 , 29 , 36-38 ]. It has been shown that in Inconel 625 (a similar FCC nickel superalloy), L-PBF exhibits increased hardness [37] , which was attributed to the finer mi-crostructure when compared to L-DED [38] . Martin et al reported that the texture is weaker in L-PBF than in L-DED.…”

Section: Tablementioning

confidence: 99%

Inconel 718 two ways: Powder bed fusion vs. directed energy deposition

Chechik

Todd

2023

Additive Manufacturing Letters

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“…Widening the scope of review to include materials such as various titanium alloys, steels, and different pairs of materials, studies of various hybrid structures can be found. [25][26][27][28][29][30][31] Several of the authors report the observations of three distinct microstructural zones in the interface zone (IZ) between the AM and CM materials. [26,31,32] These observed inhomogeneities in terms of change in grain size and degree of segregation result from the gradual decrease in strength of the thermal cyclic fluctuations in the build direction.…”

mentioning

confidence: 99%

A Study of Microstructural Tensile and Fatigue Properties Coupled with Digital Image Correlation of Hybrid Manufactured Inconel 718 Parts by Extrusion and Powder Bed Fusion

Malej,

Larsson,

Gumpinger

et al. 2024

Adv Eng Mater

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To overcome challenges associated with Additive Manufacturing (AM), a combination of AM and Conventional Manufacturing (CM) could be explored, enabling the production of hybrid structures. Nonetheless, realizing aerospace hybrid structures requires investigation into the process‐structure‐properties relationships of the AM and CM‐material and the interface zone between them. In this work, Inconel 718 is deposited onto extruded bars of the same material by Powder Bed Fusion (PBF). The interface zone from the CM zone to the PBF zone is investigated using destructive and non‐destructive testing. It is found that fractures during tensile tests occur in the CM zone. The PBF zone proved to be stronger than the CM zone (average yield strength of 1295 and 1167 MPa, respectively). A higher strength of PBF parts is related to the finer microstructure of δ‐phase precipitates and dendrite cell structure. The fatigue limit of the hybrid samples is high (Sa = 305 MPa, R=0.1). Coupled fatigue and digital image correlation at the highest stress amplitude show distinctive plastic flow dominating the CM zone. In reverse, fracture of hybrid parts at lower stress amplitudes forms preferentially in the PBF zone because of process‐related defects (gas pores and lack of fusion).This article is protected by copyright. All rights reserved.

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Correlation between microstructure heterogeneity and multi-scale mechanical behavior of hybrid LPBF-DED Inconel 625

Cited by 25 publications

References 25 publications

Negative Thermal Expansion Metamaterials: A Review of Design, Fabrication, and Applications

Negative Thermal Expansion Metamaterials: A Review of Design, Fabrication, and Applications

Inconel 718 two ways: Powder bed fusion vs. directed energy deposition

A Study of Microstructural Tensile and Fatigue Properties Coupled with Digital Image Correlation of Hybrid Manufactured Inconel 718 Parts by Extrusion and Powder Bed Fusion

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