The influence of Laves phases on the high-cycle fatigue behavior of laser additive manufactured Inconel 718

Sui, Shang; Chen, Jing; Fan, Enxiang; Yang, Haiou; Lin, Xin; Huang, Weidong

doi:10.1016/j.msea.2017.03.098

Cited by 205 publications

(53 citation statements)

References 28 publications

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“…This metallurgical phase is undesirable because it reduces ductility and tensile resistance [49]. All authors in the literature agree on the fact that additively manufactured parts contains these Laves phases that can be partially removed by performing a heat treatment [8,30,50,51].…”

Section: Laves Phasesmentioning

confidence: 99%

Plastic strain localization induced by microstructural gradient in laser cladding repaired structures

Guévenoux

Hallais

Balit

et al. 2020

Theoretical and Applied Fracture Mechanics

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Laser Cladding is an additive manufacturing technology well suited for the repair of complex metallic components. The repair is a two-step process: first, one removes the worn region and then, the initial geometry is reconstructed locally. The aim of this work is to study the influence of the microstructural gradient on the strain localization in repaired structures. More precisely, we perform in-situ SEM tensile tests completed by EBSD observations of the microstructure in the interface neighborhood between the base material and the repaired region. Furthermore, we monitor the evolution of the local plastic strain distribution at the grain level until failure. This is performed by Digital Image Correlation methods and superposition of grains contours and strain maps. The observations of grain size and plasticity are compared with predictions provided by a Hall-Petch model. The study emphasizes the importance of the microstructural gradient in the vicinity of reparation interface, more precisely it reveals that this gradient induce multiaxial strains and that the strain localization phenomenon is governed mainly by a grain size effect.

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Section: Laves Phasesmentioning

confidence: 99%

Plastic strain localization induced by microstructural gradient in laser cladding repaired structures

Guévenoux

Hallais

Balit

et al. 2020

Theoretical and Applied Fracture Mechanics

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“…During the cutting process, Inconel 718 will generate a quantity of hard phases (TiC, NbC, MoC) [19,20], which can produce a continuous and intensive shock load on the coatings of tools. Under such conditions, the coatings have to possess higher toughness to resist such shock.…”

Section: Introductionmentioning

confidence: 99%

The Performance of TiAlSiN Coated Cemented Carbide Tools Enhanced by Inserting Ti Interlayers

Han

et al. 2019

Metals

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To enhance the cutting performance of TiAlSiN coated cemented carbide tools by inserting Ti interlayers and to explore their mechanism, TiAlSiN/Ti multilayer coatings with different Ti thicknesses, including 0 nm, 25 nm, 50 nm, 100 nm, and 150 nm, were deposited onto cemented carbide (WC-10 wt%, Co) substrates by high power impulse magnetron sputtering (HiPIMS). The microstructure, hardness, grain orientation, residual stress, adhesion, and toughness of those coatings were measured, and the cutting performance against Inconel 718 was analyzed. Meanwhile, finite element method (FEM) indentation simulations were performed to gain detailed insight into the effects of Ti interlayer thickness on mechanical properties of TiAlSiN/Ti multilayer coatings. Results demonstrated that mechanical properties of TiAlSiN multilayer coatings were significantly changed after the Ti interlayer was introduced, and the multilayer coating #M2 with 25 nm Ti layer showed the excellent toughness and adhesion without sacrificing hardness too much. As Ti interlayer thickness increased, both toughness and adhesion decrease owing to the plastic mismatch between individual layers, and these changes were discussed detailedly with finite element method. Moreover, the result of the cutting experiment also revealed that the tool flank wear Vb can be reduced by the multilayer structure. This improvement is believed to be due to the increasing toughness, which alleviated the damage caused by the continuous impact load of hard phases generated by Inconel 718 during cutting.

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“…In addition to surface roughness, internal defects such as gas porosity and lack-of-fusion also play a detrimental role on the fatigue strength and statistics, since HIP is not able to close the gas porosities [139,140] as well as the large lack-of-fusion defects. Based on these considerations, the overall fatigue performance of AM (both EBM and SLM) components seems to be commonly inferior, or at maximum comparable, to the wrought counterpart [126,[139][140][141][142][143]. But, if excluding the effects of surface roughness and defects, similar deformation or fracture behaviours to the wrought counterparts are expected [97,144].…”

Section: Fatigue and Creep Properties Of Am In718mentioning

confidence: 99%

On the Microstructures and Anisotropic Mechanical Behaviours of Additively Manufactured IN718

Deng

2019

Linköping Studies in Science and Technology. Dissertations

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Additive manufacturing (AM), also known as 3D printing, offers great design flexibility for manufacturing components with complex geometries, and has attracted significant interest in the aero and energy industries in the past decades. Among the commercial AM processes, selective laser melting (SLM) and electron beam melting (EBM) are the two most widely used ones for metallic materials. Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties, weldability and low cost. Due to its excellent weldability, IN718 has been intensively applied in the AM filed, to gain more understanding of the AM processes and fully realize AM's potentials. The study objects in the present thesis include both EBM and SLM IN718. The solidification conditions in EBM and SLM are very different and are different to that of conventional cast, leading to unique microstructures mechanical properties. Therefore, this thesis aims to gain better understanding of the microstructures and anisotropic mechanical behaviours of both EBM and SLM IN718, by detailed characterizations and by comparisons with the forged counterpart. The as-built microstructure of EBM IN718 is spatially dependent: the periphery (contour) region has a mixture of equiaxed and columnar grains, while the bulk (hatch) region has columnar grains elongated along the building direction; the last solidified region close to the top sample surface shows segregation and Laves phases, otherwise the rest of the whole sample is well homogenized. Differently, the as-built microstructure of SLM IN718 is spatially homogeneous: the grains is rather equiaxed and with subgrain cell structures. These microstructures also respond differently to the standard heat treatment routines for the conventional counterparts. Anisotropic mechanical properties are evident in the room temperature tensile tests and high temperature dwell-fatigue tests. The anisotropic tensile properties of EBM IN718 at room temperature are more likely due to the directional alignment of porosities along the building direction rather than the strong crys-In these papers I have been the main contributor, performing all the experimental work, characterization, analysis and manuscript writing, under the supervision of Johan Moverare and Ru Lin Peng.

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The influence of Laves phases on the high-cycle fatigue behavior of laser additive manufactured Inconel 718

Cited by 205 publications

References 28 publications

Plastic strain localization induced by microstructural gradient in laser cladding repaired structures

Plastic strain localization induced by microstructural gradient in laser cladding repaired structures

The Performance of TiAlSiN Coated Cemented Carbide Tools Enhanced by Inserting Ti Interlayers

On the Microstructures and Anisotropic Mechanical Behaviours of Additively Manufactured IN718

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