A comprehensive literature review on laser powder bed fusion of Inconel superalloys

Volpato, Guilherme Maziero; Tetzlaff, Ulrich; Fredel, Márcio C.

doi:10.1016/j.addma.2022.102871

Cited by 39 publications

(18 citation statements)

References 307 publications

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“…Our nonheat‐treated specimen has the typical size and columnar shape of nickel‐based superalloys manufactured by PBF‐LB/M in as‐build condition. [ 35,41,42 ] Grain growth was greater in our bulk specimens than in previous studies that applied a similar HT. [ 35,43 ] This variation could be due to different measurement techniques or slightly higher temperatures in the first two cycles of the employed HT.…”

Section: Discussionmentioning

confidence: 68%

Effect of Process Variables on Microstructure, Flow, and Tensile Properties of Nickel‐Based Superalloys with Designed Porous Structures Manufactured by Laser‐Based Powder Bed Fusion

2023

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The nickel‐based superalloys Haynes 282 and Inconel 625 are processed using laser‐based powder bed fusion of metals (PBF‐LB/M) to manufacture designed materials (DMs) with configurable open‐porous morphology. Such structures can be utilized in large gas turbines, for example, as high‐frequency dampers, heat exchangers, and for transpiration cooling features. This research investigates the effects of the applied volume energy input and laser deflection angle (as calculated by position) on the macro‐ and microstructure and tensile and flow properties of DMs made from Haynes 282. Furthermore, a novel combination of DMs and cubic lattice structures made from Inconel 625 has been investigated regarding potential improvements. The substantial interface between the two features, DM and lattice structure, is visually analyzed using microcomputed tomography. The analysis of the hierarchical DMs reveals that the combination of lattice structures and DMs is manufacturable and has benefits in terms of mechanical strength while having less significant effects on flow properties.

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Section: Discussionmentioning

confidence: 68%

Effect of Process Variables on Microstructure, Flow, and Tensile Properties of Nickel‐Based Superalloys with Designed Porous Structures Manufactured by Laser‐Based Powder Bed Fusion

2023

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“…Yet, in most cases the hypothesis of isotropic elastic constants is used. This holds true even though it is known that crystallographic texture is present in PBF-LB/M/ IN718 manufactured specimens (Volpato et al, 2022). Fig.…”

Section: Influence Of Preferred Grain Orientationmentioning

confidence: 84%

“…Further, the geometrical freedom enables the design of sophisticated internal cooling geometries in such parts. Owing to its excellent weldability (Lingenfelter, 1989) paired with its potential in high-temperature applications up to 650 C (Collier et al, 1988), the alloy Inconel 718 (denoted IN718) is an established candidate for PBF-LB processing (Volpato et al, 2022). IN718 is a niobium-, aluminium-and titanium-containing precipitation-hardenable Ni-Cr-Fe-Mobased superalloy.…”

Section: Introductionmentioning

confidence: 99%

“…If one wants to select an appropriate model for the calculation of the DECs, it is commonly accepted that the Kro ¨ner model provides a reasonable agreement to experimental data for equiaxed polycrystalline IN718 (Schro ¨der, and IN625 (Wang et al, 2016). However, another consequence of the localized melting and solidification during the PBF-LB process is the columnar grain growth as reviewed by Volpato et al (2022). In such cases, it has been experimentally shown that the Reuss model represents the materials behavior for PBF-LB/M/IN718 more accurately (Schro ¨der et al, 2022;.…”

Section: Introductionmentioning

confidence: 99%

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Texture-based residual stress analysis of laser powder bed fused Inconel 718 parts

Schröder¹,

Evans²,

Luzin³

et al. 2023

J Appl Crystallogr

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Although layer-based additive manufacturing methods such as laser powder bed fusion (PBF-LB) offer an immense geometrical freedom in design, they are typically subject to a build-up of internal stress (i.e. thermal stress) during manufacturing. As a consequence, significant residual stress (RS) is retained in the final part as a footprint of these internal stresses. Furthermore, localized melting and solidification inherently induce columnar-type grain growth accompanied by crystallographic texture. Although diffraction-based methods are commonly used to determine the RS distribution in PBF-LB parts, such features pose metrological challenges in their application. In theory, preferred grain orientation invalidates the hypothesis of isotropic material behavior underlying the common methods to determine RS. In this work, more refined methods are employed to determine RS in PBF-LB/M/IN718 prisms, based on crystallographic texture data. In fact, the employment of direction-dependent elastic constants (i.e. stress factors) for the calculation of RS results in insignificant differences from conventional approaches based on the hypothesis of isotropic mechanical properties. It can be concluded that this result is directly linked to the fact that the {311} lattice planes typically used for RS analysis in nickel-based alloys have high multiplicity and less strong texture intensities compared with other lattice planes. It is also found that the length of the laser scan vectors determines the surface RS distribution in prisms prior to their removal from the baseplate. On removal from the baseplate the surface RS considerably relaxes and/or redistributes; a combination of the geometry and the scanning strategy dictates the sub-surface RS distribution.

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“…In addition, the cost of 316L stainless steel is lower than other medical alloy materials. [ 1 ] The traditional manufacturing process of 316L stainless steel is smelting, forging, rolling, and cold forming. [ 2 ] However, the traditional preparation techniques for 316L stainless steel can improve its strength and hardness, but usually at the expense of its toughness and plasticity.…”

Section: Introductionmentioning

confidence: 99%

Effect of Shot Peening Strengths on Microstructure and Mechanical Properties of 316L Stainless Steel Prepared by 3D Printing

et al. 2023

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Herein, the influence of shot peening (SP) on the microstructure and mechanical properties of 3D printed 316L stainless steel is studied by optical microscopy (OM), electron backscattered diffraction (EBSD), and mechanical properties testing. The changes in microstructure and mechanical properties of 316L stainless steel by 3D printing under different SP strengths are explored, which are drawn as follows: 1) the microstructure of 3D‐printed 316L stainless steel is greatly refined, and the thickness of ultrafine microstructure in the surface layer increases from 0 to 112.5 μm with the increase in peening strengths from 0 to 0.4 MPa; 2) with the increase of peening strengths from 0 to 0.4 MPa, the hardness increases from 236 to 518 HV, and yield strength increases from 547.3 to 740.7 MPa; and 3) based on the EBSD results, the enhanced hardness and yield strength are caused by refinement hardening and dislocation hardening for the SP samples. In addition, it should be noted that the SP decreases the elongation of 3D‐printed 316L stainless steel up to 9%, and makes the ultimate tensile strength reach the maximum value of 871.2 MPa at 0.2 MPa SP strength.

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A comprehensive literature review on laser powder bed fusion of Inconel superalloys

Cited by 39 publications

References 307 publications

Effect of Process Variables on Microstructure, Flow, and Tensile Properties of Nickel‐Based Superalloys with Designed Porous Structures Manufactured by Laser‐Based Powder Bed Fusion

Effect of Process Variables on Microstructure, Flow, and Tensile Properties of Nickel‐Based Superalloys with Designed Porous Structures Manufactured by Laser‐Based Powder Bed Fusion

Texture-based residual stress analysis of laser powder bed fused Inconel 718 parts

Effect of Shot Peening Strengths on Microstructure and Mechanical Properties of 316L Stainless Steel Prepared by 3D Printing

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