Additive manufacturing of a Ni-20 wt%Cr binary alloy by laser powder bed fusion: Impact of the microstructure on the mechanical properties

Hug, Éric; Lelièvre, Maxime; Folton, Cendrine; Ribet, A.; Martinez-Celis, Mayerling; Keller, Clément

doi:10.1016/j.msea.2022.142625

Cited by 10 publications

(2 citation statements)

References 50 publications

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“…The microstructure of the produced (mode: P = 200 W and V = 1600 mm/s) sample is characterized by cells (Figure 8). The cell structure formation during SLM is usually ascribed to thermal distortions during SLM, which are caused by the constraints surrounding the melt bath and thermal cycling [60,61]. The dislocation (cell) structure forms within the grains after solidification.…”

Section: Discussionmentioning

confidence: 99%

Mechanical Behavior of a Medium-Entropy Fe65(CoNi)25Cr9.5C0.5 Alloy Produced by Selective Laser Melting

et al. 2023

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Specimens of a medium-entropy Fe65(CoNi)25Cr9.5C0.5 (in at.%) alloy were produced using additive manufacturing (selective laser melting, SLM). The selected parameters of SLM resulted in a very high density in the specimens with a residual porosity of less than 0.5%. The structure and mechanical behavior of the alloy were studied under tension at room and cryogenic temperatures. The microstructure of the alloy produced by SLM comprised an elongated substructure, inside which cells with a size of ~300 nm were observed. The as-produced alloy demonstrated high yield strength and ultimate tensile strength (YS = 680 MPa; UTS = 1800 MPa) along with good ductility (tensile elongation = 26%) at a cryogenic temperature (77 K) that was associated with the development of transformation-induced plasticity (TRIP) effect. At room temperature, the TRIP effect was less pronounced. Consequently, the alloy demonstrated lower strain hardening and a YS/UTS of 560/640 MPa. The deformation mechanisms of the alloy are discussed.

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Section: Discussionmentioning

confidence: 99%

Mechanical Behavior of a Medium-Entropy Fe65(CoNi)25Cr9.5C0.5 Alloy Produced by Selective Laser Melting

et al. 2023

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“…The melt pool size has been identified as a critical parameter for maintaining optimal building conditions [13]. In microstructure genesis, the melt pool size and the cooling rate determine the properties of the future clad as well [14]. However, to accurately model the melt pool size and shape, and to solve the issues linked to the fluid state in the melt pool such as balling effect, keyhole, and porosity formation, Computational Fluid Dynamic (CFD) analysis is required.…”

Section: Introductionmentioning

confidence: 99%

Impact of Boundary Parameters Accuracy on Modeling of Directed Energy Deposition Thermal Field

Gallo,

Duchêne,

Quy Duc Pham

et al. 2024

Metals

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Within the large Additive Manufacturing (AM) process family, Directed Energy Deposition (DED) can be used to create low-cost prototypes and coatings, or to repair cracks. In the case of M4 HSS (High Speed Steel), a reliable computed temperature field during DED process allows the optimization of the substrate preheating temperature value and other process parameters. Such optimization is required to avoid failure during the process, as well as high residual stresses. If 3D DED simulations provide accurate thermal fields, they also induce huge computation time, which motivates simplifications. This article uses a 2D Finite Element (FE) model that decreases the computation cost through dividing the CPU time by around 100 in our studied case, but it needs some calibrations. As described, the identification of a correct data set solely based on local temperature measurements can lead to various sets of parameters with variations of up to 100%. In this study, the melt pool depth was used as an additional experimental measurement to identify the input data set, and a sensitivity analysis was conducted to estimate the impact of each identified parameter on the cooling rate and the melt pool dimension.

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Dispersoid coarsening and slag formation during melt-based additive manufacturing of MA754

Stubbs,

Hou,

Leonard

et al. 2024

Additive Manufacturing Letters

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Additive manufacturing of a Ni-20 wt%Cr binary alloy by laser powder bed fusion: Impact of the microstructure on the mechanical properties

Cited by 10 publications

References 50 publications

Mechanical Behavior of a Medium-Entropy Fe65(CoNi)25Cr9.5C0.5 Alloy Produced by Selective Laser Melting

Mechanical Behavior of a Medium-Entropy Fe65(CoNi)25Cr9.5C0.5 Alloy Produced by Selective Laser Melting

Impact of Boundary Parameters Accuracy on Modeling of Directed Energy Deposition Thermal Field

Dispersoid coarsening and slag formation during melt-based additive manufacturing of MA754

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