Effect of powder recycling on room and elevated temperature damage tolerability of Inconel 718 alloy fabricated by laser powder bed fusion

Choi, Heesoo; Kim, Sumin; Goto, Masahiro; Kim, Sangshik

doi:10.1016/j.matchar.2020.110818

Cited by 13 publications

(5 citation statements)

References 34 publications

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“…Micrographic observation was made on each IN706 specimen by using an SEM (scanning electron microscope) (model: JEOL JSM‐7610F). Etching was conducted using an aqua regina solution (30‐mL HCl + 10‐mL NHO 3 + 20‐mL H 2 O) 16,36,37 . The grain size was measured by using a linear intercept method according to ASTM E112.…”

Section: Methodsmentioning

confidence: 99%

“…Etching was conducted using an aqua regina solution (30-mL HCl + 10-mL NHO 3 + 20-mL H 2 O). 16,36,37 The grain size was measured by using a linear intercept method according to ASTM E112. Strain-controlled LCF tests were conducted according to ASTM E606 using a servo-hydraulic dynamic testing machine (model: Instron 8801) at 650 C. 38 Applied total strain amplitude was controlled to be 0.6%, 0.5%, 0.4%, and 0.3%, respectively, at an R ratio (minimum stress/ maximum stress) of À1 and a frequency of 0.25 Hz.…”

Section: Introductionmentioning

confidence: 99%

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Effect of microstructure on low cycle fatigue behavior of Inconel 706 at 650°C

Lee,

Kim,

Kim

et al. 2023

Fatigue Fract Eng Mat Struct

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Four different types of specimens were prepared from the center and the periphery of two large IN706 forged discs of commercial scale, and low cycle fatigue (LCF) tests were conducted at 650°C.The IN706 specimens with lower LCF lives showed relatively large fraction of cleavage‐like fracture along linearly aligned η (Ni3Ti) precipitates in the area of crack propagation. The amount of η precipitates for those specimens with greater LCF lives was negligible, and the fracture mode of crack propagation was dominantly intergranular. Crack initiation was mainly by persistent slip band (PSB) cracking at the surface, and no notable difference was found for each specimen. The correlation between tensile properties, grain size, and LCF lives of IN706 at 650°C appeared to be not as significant as expected.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of microstructure on low cycle fatigue behavior of Inconel 706 at 650°C

Lee,

Kim,

Kim

et al. 2023

Fatigue Fract Eng Mat Struct

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“…In terms of fatigue properties, the fatigue crack propagation (FCP) rate of Inconel 718 specimens at both 25 • C and 650 • C does not appear to be related to the powder reuse cycles [235] (figures 12(e-i) and (e-ii)). Paccou et al [182] observed that L-PBF Inconel 718 printed with reused powders showed slightly reduced fatigue life (figure 12(f)) when loaded with small plastic amplitudes (∆ε p /2 = 0.000 04), However, the difference was even smaller than the difference of different parts prepared under the same parameters.…”

Section: Powder Reusability Of Nickel Alloymentioning

confidence: 97%

“…Due to its poor machinability, nickel-based superalloys, such as Inconel 718 [230], Inconel 738 [231], Inconel 625 [232], or Hastelloy X alloy [233], are frequently investigated for L-PBF due to the advantage of near-net shaping. To reduce the fabrication cost and improve the powder usage efficiency, there are already some investigations on powder reuse for L-PBF nickel alloys [35,42,174,182,194,198,199,201,234,235].…”

Section: Powder Reusability Of Nickel Alloymentioning

confidence: 99%

Characterization, preparation, and reuse of metallic powders for laser powder bed fusion: a review

Sun,

Chen,

Liu

et al. 2023

Int. J. Extrem. Manuf.

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Laser powder bed fusion (L-PBF) has attracted significant attention since its inception, providing unprecedented advantages to fabricate metallic components with complex geometry. The quality and performance of as-printed alloys is an intricate function consisting of numerous factors linking the feedstock powders, manufacturing, and post-treatment. As the starting materials, powders play a critical role in influencing the printing consistency, total fabrication cost, and mechanical properties. In consideration of its importance for L-PBF, the present review aims to review the recent progress on metallic powders for L-PBF focusing on powder characterization, powder fabrication, and powder reuse. The methods of powder characterization and fabrication were presented in the beginning by analyzing the principles and corresponding advantages and limitations. Subsequently, the effect of powder reuse on the powder characteristics and mechanical performance of L-PBF parts is analyzed focusing on steels, nickel-based superalloys, Ti and Ti alloys, and Al alloys. The evolution trend of powders and as-printed parts varies for different alloy systems based on the existing studies, which makes the proposal of a unified reuse protocol infeasible. Finally, perspectives are presented to cater to the increasing applications of AM technologies for future investigations. The present state-of-the-art work can pave the way for the broad industrial applications of L-PBF by enhancing printing consistency and reducing the total cost from the perspective of powders.

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“…Additionally, high strength is significant for sound absorbers to guarantee efficient sound absorption in the pristine phase. ,, When subjected to an impact energy, the high-strength materials may not sustain large strain deformations and could retain the original structural morphology for persistent sound absorption. When the large-strain deformation is inevitable, the materials are supposed to be damage tolerant to effectively dissipate the impact energy. − However, for traditional truss lattices, the stress concentration on nodes and rods are pronounced, thereby easily triggering premature or even catastrophic failures. , As such, for achieving these aforementioned properties (i.e., noise reduction, high strength, and damage tolerance), a novel class of multifunctional metamaterial with elaborate topological architectures is highly desired.…”

Section: Introductionmentioning

confidence: 99%

New Class of Multifunctional Bioinspired Microlattice with Excellent Sound Absorption, Damage Tolerance, and High Specific Strength

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Although mutually independent, simultaneous sound absorption and superior mechanical properties are often sought after in a material. One main challenge in achieving such a material will be on how to design it. Herein, we propose a bamboo-inspired design strategy to overcome the aforementioned challenges. Building on top of the basic octet-truss design, we introduce a hollow-tube architecture to achieve lightweight property and mechanical robustness and a septum-chamber architecture to introduce acoustic resonant cells. The concept is experimentally verified through samples fabricated using selective laser melting with the Inconel 718 alloy. High sound absorption coefficients (>0.99) with broadband spectra, damage-tolerant behavior, high specific strength (up to 81.2 MPa·cm3/g), and high specific energy absorption of 40.1 J/g have been realized in this design. The sound absorption capability is attributed to Helmholtz resonance through the pore-and-cavity morphology of the structure. Microscopically speaking, dissipation primarily occurs via the viscous frictional flow and thermal boundary layers on the air and microlattice interactions at the narrow pores. The high strength is in turn attributed to the near-membrane state of stress in the plate structures and the excellent strength of the base material. Overall, this work presents a new design concept for developing multifunctional metamaterials.

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Effect of powder recycling on room and elevated temperature damage tolerability of Inconel 718 alloy fabricated by laser powder bed fusion

Cited by 13 publications

References 34 publications

Effect of microstructure on low cycle fatigue behavior of Inconel 706 at 650°C

Effect of microstructure on low cycle fatigue behavior of Inconel 706 at 650°C

Characterization, preparation, and reuse of metallic powders for laser powder bed fusion: a review

New Class of Multifunctional Bioinspired Microlattice with Excellent Sound Absorption, Damage Tolerance, and High Specific Strength

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