Effects of Homogenization Heat Treatment on Mechanical Properties of Inconel 718 Sandwich Structures Manufactured by Selective Laser Melting

Zaharia, Sebastian Marian; Chicoș, Lucia Antoneta; Lancea, Camil; Pop, Mihai Alin

doi:10.3390/met10050645

Cited by 11 publications

(5 citation statements)

References 51 publications

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“…The result of the comparative study, between the bending reaction forces resulting from the experimental tests and the reaction forces that appeared in the supports of the FEA model ( Figure 19 d), presents an adequate validation of the information measured and used when testing the specimens and the FEA model [ 34 ], the errors that appear between these results are within a range of 0.4% to 3%.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Performances of Lightweight Sandwich Structures Produced by Material Extrusion-Based Additive Manufacturing

2020

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Material Extrusion-Based Additive Manufacturing Process (ME-AMP) via Fused Filament Fabrication (FFF) offers a higher geometric flexibility than conventional technologies to fabricate thermoplastic lightweight sandwich structures. This study used polylactic acid/polyhydroxyalkanoate (PLA/PHA) biodegradable material and a 3D printer to manufacture lightweight sandwich structures with honeycomb, diamond-celled and corrugated core shapes as a single part. In this paper, compression, three-point bending and tensile tests were performed to evaluate the performance of lightweight sandwich structures with different core topologies. In addition, the main failure modes of the sandwich structures subjected to mechanical tests were evaluated. The main failure modes that were observed from mechanical tests of the sandwich structure were the following: face yielding, face wrinkling, core/skin debonding. Elasto-plastic finite element analysis allowed predicting the global behavior of the structure and stressing distribution in the elements of lightweight sandwich structures. The comparison between the results of bending experiments and finite element analyses indicated acceptable similarity in terms of failure behavior and force reactions. Finally, the three honeycomb, diamond-celled and corrugated core typologies were used in the leading edge of the wing and were impact tested and the results created favorable premises for using such structures on aircraft models and helicopter blade structures.

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Section: Resultsmentioning

confidence: 99%

Mechanical Performances of Lightweight Sandwich Structures Produced by Material Extrusion-Based Additive Manufacturing

2020

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“…These results are justified because the bottom area of the sample structure suffered repeated heating cycles during the SLM process, which was assimilated to a heat treatment. This process led to enhanced precipitation hardening and was responsible for the higher microhardness at the bottom of the sample [54]. The lower microhardness value at the top of the lattice structure could be attributed to a decrease in the strengthening phase.…”

Section: Microhardness Testsmentioning

confidence: 96%

“…The heat-treated specimens showed an increase in microhardness of 30.4% for the spherical specimens (47.3% for the elliptical specimens) investigated in the upper section and 28.43% for the spherical specimens (40.9% for the elliptical specimens) investigated in the lower section, when compared to the as-fabricated specimens.These results are justified because the bottom area of the sample structure suffered repeated heating cycles during the SLM process, which was assimilated to a heat treatment. This process led to enhanced precipitation hardening and was responsible for the higher microhardness at the bottom of the sample[54]. The lower microhardness value at the top of the lattice structure could be attributed to a decrease in the strengthening phase.…”

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confidence: 97%

Mechanical Properties and Microstructure of Inconel 718 Lattice Structures Produced by Selective Laser Melting Process

Zaharia,

Lancea,

Kruk

et al. 2024

Materials

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This article presents the results of an analysis regarding the microstructure, mechanical strength, and microhardness of two kinds of samples built through selective laser melting with Inconel 718, the most frequently used alloy in metal additive manufacturing due to its excellent mechanical properties. The sample geometry was made up of two types of lattice structures with spherical and hyperbolical stiffness elements. The goals of these studies are to determine how homogenization heat treatment influences the microhardness and the mechanical properties of the specimens and to identify the structure with the best mechanical properties. The analysis showed that heat treatment was beneficial because the regular dendritic structure disappears, the δ phase precipitates at the grain boundaries, and both the γ and γ″ phases dissolve. It has also been shown that the structures with hyperbolical stiffness elements have better compressive strength than the structures with the elliptical structures, with a 47.6% increase for the as-fabricated structures and an approximate 50% increase for the heat-treated structure.

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“…Nevertheless, the cracks and stress concentration are susceptible to generation in the laser cladding process [5]. There is an increasingly prominent solution in enhancing the surface properties of the coating by post-treatment methods, such as aging, quenching, heat treatment, and tempering [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Simultaneously Improving Microstructures and Wear Properties of Ni60 Coating by Heat Treatment

Wang

Zhang

et al. 2022

Metals

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Ni60 self-lubricated anti-wear composite coatings were successfully precipitated on the 35CrMoV substrate by laser cladding technology. The effects of heat treatment on the macro-morphology, microstructure, precipitated phase, microhardness, and wear properties of the composite coatings with different heat treatment temperatures (25 °C, 500 °C, 600 °C, and 700 °C for 1 h) were investigated systemically. The macro-morphology, microstructure, precipitated phases, and elements distribution of laser cladding layers were detected by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS), respectively. The mechanical and tribological properties of the cladding layers were tested using a microscopic Vickers hardness tester and friction and wear tester, respectively. The results show that the main phases of Ni60 coatings are composed of γ-(Ni, Fe), Cr7C3, Cr23C6, CrB, CrFeB, and Cr2Ni3. In particular, the micro-structure and mechanical properties reach the best levels after heat treatment at 600 °C. The micro-hardness, average friction coefficient, and wear volume of the cladding layer are 771.4 to 915.8 HV1 and 0.434 and 2.9546 × 10−5 mm3, respectively. In conclusion, the micro-structure and mechanical properties of the cladding layer are greatly improved by the proper heat treatment temperature.

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Effects of Homogenization Heat Treatment on Mechanical Properties of Inconel 718 Sandwich Structures Manufactured by Selective Laser Melting

Cited by 11 publications

References 51 publications

Mechanical Performances of Lightweight Sandwich Structures Produced by Material Extrusion-Based Additive Manufacturing

Mechanical Performances of Lightweight Sandwich Structures Produced by Material Extrusion-Based Additive Manufacturing

Mechanical Properties and Microstructure of Inconel 718 Lattice Structures Produced by Selective Laser Melting Process

Simultaneously Improving Microstructures and Wear Properties of Ni60 Coating by Heat Treatment

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