Mechanical Characterization of Near-Isotropic Inconel 718 Fabricated by Laser Powder-Bed Fusion

Sharma, Shilpi; Palaniappan, Karthik; Mishra, Vagish D.; Vedantam, Srikanth; Murthy, H.; Rao, Balkrishna C.

doi:10.1007/s11661-022-06867-z

Cited by 5 publications

(4 citation statements)

References 74 publications

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“…Sharma et al characterized vertical walls of IN718 manufactured by PBF-LB/M and after different heat treatments. [12] After a double-stage solution heat treatment followed by two-stage precipitation hardening, the tensile strength at RT in BD is lower compared to our results while the elongation at fracture is somewhat higher (cf. Table 5).…”

Section: Tensile Testscontrasting

confidence: 70%

“…[6] Therefore, the adaptation and optimization of possible heat treatments for AM materials are further and more current research topics. [6,[10][11][12] Comprehensive studies on the mechanical properties, in particular the LCF behavior at high temperatures on heat-treated AM variants, are still lacking. This is also the case for IN718 manufactured by PBF-LB/M.…”

Section: Doi: 101002/adem202302122mentioning

confidence: 99%

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Tensile and Low‐Cycle Fatigue Behavior of Laser Powder Bed Fused Inconel 718 at Room and High Temperature

Sonntag,

Piesker,

Ávila Calderón

et al. 2024

Adv Eng Mater

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This study investigates the room‐ and high‐temperature (650 °C) tensile and low‐cycle fatigue behavior of Inconel 718 produced by laser powder bed fusion (PBF‐LB/M) with a four‐step heat treatment and compares the results to the conventional wrought material. The microstructure after heat treatment is characterized on different length scales. Compared to the wrought variant, the elastic and yield properties are comparable at both test temperatures while tensile strength, ductility, and strain hardening capacity are lower. The fatigue life of the PBF‐LB/M variant at room temperature is slightly lower than that of the wrought material, while at 650 °C, it is vice versa. The cyclic stress response for both material variants is characterized by cyclic softening, which is more pronounced at the higher test temperature. High strain amplitudes (≥ 0.7 %) at room temperature and especially a high testing temperature result in the formation of multiple secondary cracks at the transitions of regions comprised of predominantly elongated grain morphology and of columns of stacked grains with ripple patterns in the PBF‐LB/M material. This observation and pronounced crack branching and deflection indicate that the cracks are controlled by sharp micromechanical gradients and local 〈001〉 crystallite clusters.This article is protected by copyright. All rights reserved.

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Section: Tensile Testscontrasting

confidence: 70%

Section: Doi: 101002/adem202302122mentioning

confidence: 99%

Tensile and Low‐Cycle Fatigue Behavior of Laser Powder Bed Fused Inconel 718 at Room and High Temperature

Sonntag,

Piesker,

Ávila Calderón

et al. 2024

Adv Eng Mater

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“…Due to the high hardness, strength, viscosity, and toughness of the Inconel 718 superalloy, it is difficult to meet the required quality requirements using traditional grinding techniques [1][2][3]. Therefore, magnetic abrasive finishing (MAF) technology is used to attempt to improve its surface quality [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Machining Property in Inconel 718 Superalloy Grinding with Al2O3- and CBN/Fe-Based Spherical Magnetic Abrasives

Jiang,

Zhang,

Zhang

et al. 2024

Coatings

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A comparative analysis was studied on the finishing performance of spherical CBN/Fe-based magnetic abrasive particles (MAPs) and Al2O3/Fe-based magnetic abrasive particles (MAPs) prepared by the gas atomization method in the magnetic abrasive finishing (MAF) of the Inconel 718 superalloy. In the MAF, it was found that compared with Al2O3/Fe-based MAPs, CBN/Fe-based MAPs have a lower grinding temperature and generate less heat during the grinding of the Inconel 718 superalloy. The grinding pressure generated on the workpiece is relatively stable (Al2O3/Fe-based MAPs have a larger fluctuation range of grinding pressure on the workpiece surface during the grinding process). The surface roughness of the workpiece rapidly drops from Ra 0.57 μm to Ra 0.039 μm, and the material removal reaches 42 mg within 20 min. After finishing, the scratches on the surface of the workpiece basically disappear, the contour curve is relatively flat, and there is almost no adhesion on the surface of the workpiece. The mirror effect of the superalloy surface is good, and ultimately a better surface quality can be obtained.

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“…Zhang et al [15] found that the strength and hardness of the material increased after solution and aging standard heat treatment, while the ductility decreased due to the precipitation of acicular δ phases and γ /γ phases. SHARMA et al [16] studied the microstructural evolution and accompanying mechanical properties of the as-deposited and post-heat-treated IN718 alloy. They used low laser-volume energy density to characterize the effect of sample orientation and heat treatment on the properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of Process Parameters and Heat Treatment on Microstructure and Mechanical Characteristics of Laser Powder Bed Fusion Alloy Inconel 718

et al. 2023

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A laser powder bed fusion (LPBF) Inconel 718 (IN718) alloy was fabricated under different process parameters, and the samples with optimal process parameters were treated by subsequent heat treatment. The outcomes demonstrated that the pores’ size and shape were influenced by the process parameters. The porosity of the samples first grew and subsequently reduced as the volume energy density increased, and the types of pores changed from lack-of-fusion pores to gas holes and keyhole pores. The porosity of the samples with three process parameters were 3.46%, 0.15% and 1.26%, respectively. The sample of 60.0 J/mm3 was chosen for a single solution (heat treatment at 980 °C for 1 h, SS) and direct aging (heat treatment at 720 °C for 8 h and then 620 °C for 8 h, DA), and the microstructure evolution of the samples was examined. Because of the segregation of the elements Nb and Mo, the Laves phase was distributed among the dendrites in the as-built (AB) sample. The solution heat treatment dissolved the Laves phase and precipitated the δ phase, while aging heat treatment precipitated the γ′/γ” phases. Additionally, the impact of the second phase on the tensile characteristics was looked into. The DA sample had the highest strength, with a tensile strength of 1458 MPa and a yield strength of 1271 MPa. With tensile and yield strengths of 980 MPa and 620 MPa, respectively, the AB sample had the lowest strength due to the Laves phase’s role as the crack initiator. The Laves phase dissolved and the γ′/γ”-strengthened phase precipitated, leading to an increase in the strength of the heat-treated specimens.

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Mechanical Characterization of Near-Isotropic Inconel 718 Fabricated by Laser Powder-Bed Fusion

Cited by 5 publications

References 74 publications

Tensile and Low‐Cycle Fatigue Behavior of Laser Powder Bed Fused Inconel 718 at Room and High Temperature

Tensile and Low‐Cycle Fatigue Behavior of Laser Powder Bed Fused Inconel 718 at Room and High Temperature

A Comparative Study of Machining Property in Inconel 718 Superalloy Grinding with Al2O3- and CBN/Fe-Based Spherical Magnetic Abrasives

Effects of Process Parameters and Heat Treatment on Microstructure and Mechanical Characteristics of Laser Powder Bed Fusion Alloy Inconel 718

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