Microstructure evolution during indentation of Inconel-718 created by additive manufacturing

Rifat, Mustafa; DeMeter, Edward C.; Basu, Saurabh

doi:10.1016/j.msea.2020.139204

Cited by 9 publications

(8 citation statements)

References 27 publications

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“…We note that there are different sources of inhomogeneity in AM components. In 382 previous studies that focused on indentation of Inconel 718 [18,62], the authors explored 383 the combined effect of surface roughness and void inhomogeneities on the mechanics of 384 indentation. Using numerical simulations the authors have also realized that the nature 385 of the inhomogeneities characterized by their shape, size, aspect ratio [63] and location 386 We note that there are different sources of inhomogeneity in AM components.…”

Section: Effect Of Local Surface Texture On Residual Stresses Resulti...mentioning

confidence: 99%

“…Using numerical simulations the authors have also realized that the nature 385 of the inhomogeneities characterized by their shape, size, aspect ratio [63] and location 386 We note that there are different sources of inhomogeneity in AM components. In previous studies that focused on indentation of Inconel 718 [18,62], the authors explored the combined effect of surface roughness and void inhomogeneities on the mechanics of indentation. Using numerical simulations, the authors have also realized that the nature of the inhomogeneities characterized by their shape, size, aspect ratio [63], and location within the part geometry [64] complicate the mechanical response of components.…”

Section: Effect Of Local Surface Texture On Residual Stresses Resulti...mentioning

confidence: 99%

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Effect of Prior Surface Textures on the Resulting Roughness and Residual Stress during Bead-Blasting of Electron Beam Melted Ti-6Al-4V

et al. 2022

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The finishing of additive manufactured (AM) components is crucial for endowing them with fatigue resistance. Unfortunately, current AM processes naturally promote anisotropic surface characteristics that make it challenging to optimize finishing processes. In this study, bead-blasting is explored as a process for finishing Electron Beam Melted (EBM) Ti-6Al-4V. The effects of anisotropic roughness characteristics on the mechanics of bead-blasting are delineated using surface texture measurements via optical profilometry and residual stress measurements via X-ray diffraction. As-received surfaces resulting from AM, as well as those that have been Electrical Discharge Machined (EDM), are studied. It is seen that pre-processed roughness textures heavily influence the final textures and residual stresses. These linkages are quantified using a plasticity index as the governing metric—a rougher surface features a larger plastic index, which results in comparatively greater evolution of its texture characteristics than a smoother surface after equivalent bead-blasting treatments. The mechanics of this evolution are delineated using energy-controlled indentation as a model representing a single impact in bead-blasting. It is seen that rougher surfaces featuring complex textures in as-received states also produce complex stress states featuring a greater level of locally tensile stresses during indentation compared with smoother surfaces. Approaches to address these complications are proposed that can potentially transform a printed, non-functional surface into one that is optimized for fatigue resistance.

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Section: Effect Of Local Surface Texture On Residual Stresses Resulti...mentioning

confidence: 99%

Section: Effect Of Local Surface Texture On Residual Stresses Resulti...mentioning

confidence: 99%

Effect of Prior Surface Textures on the Resulting Roughness and Residual Stress during Bead-Blasting of Electron Beam Melted Ti-6Al-4V

et al. 2022

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“…Due to this demand, attempts are being made to improve the properties of alloy 718 by adding some additives [30] or by changing the production method. Therefore, the additive manufacturing method is becoming extremely popular [31][32][33][34][35][36][37][38]. All changes and modifications in the area of chemical composition and the manufacturing technology affect the precipitation phenomena that determine the structure of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Thermal Diffusivity Characteristics of the IN718 Alloy Tested with the Modified Pulse Method

et al. 2022

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The article presents the use of the modified pulse method (MPM) to determine the temperature characteristics of the thermal diffusivity of alloy 718. The experiment was carried out in the temperature range of 20–900 °C during the double heating of the sample with an interval of two weeks. The results of our own research showed a good correlation in the temperature range of 300–500 °C, during the first heating of the sample, with the recommended changes in thermal diffusivity by NPL & ASM and data from the MPDB database. On the other hand, clear deviations in the results occurred in the range of temperature changes up to about 300 °C, most likely responsible for the electron component of the conductivity of this alloy, and in the range above 700 °C, where there is a clear minimum that may be caused by the δ phase precipitation phenomenon.

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“…[ 17 ] Nowadays, WAAM technology is widely used in aluminum alloy, [ 8,30–34 ] Ti6Al4V, [ 35–38 ] stainless steel, [ 26,39–41 ] and nickel base alloy. [ 3,4,7,9,42–47 ] Such as Zhang et al [ 8 ] studied the evolution of microstructure structure and mechanical properties of Al–6Mg alloy in the manufacture using variable polarity CMT arc as a power source. The effects of forced interpass cooling on the material properties of wire arc additively manufactured had been researched by Wua et al, [ 35 ] CO is used to cool the deposited metal, which speeds up the cooling speed and finally makes the parts have better mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, there are many studies of Inconel 625 alloy additive manufacture, including the plastic deformation behavior, dynamic recrystallization, microstructure investigation, parametric study, and mechanical model. [ 1–3,6,37,39,40,43,45–47,52–55 ] Hua et al [ 42 ] got the Inconel 625 super alloy sample, which is fabricated by DED, and treated by the hot compression tests. The plastic deformation behavior and dynamic recrystallization (DRX) phenomenon were investigated by them.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Thick‐Walled Inconel 625 Alloy Manufactured by Wire Arc Additive Manufacture with Different Torch Paths

Jiang

Zhang

et al. 2020

Adv Eng Mater

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Wire arc additive manufacture (WAAM) technology has attracted more and more attention. WAAM technology provides a way to manufacture a large‐scale part at a low cost and with less material loss. Inconel 625 alloys are widely used for their excellent mechanical properties and corrosion resistance. Therefore, it is important to investigate the performance of Inconel 625 alloy in WAAM. Herein, cold metal transfer (CMT) arc is used as the heat source to fabricate thick‐walled parts of Inconel 625 alloy by WAAM, and study the difference between microstructure and mechanical properties under the different torch trajectories. The result shows that the grains inside the parts are all thick dendrites and show the trend of epitaxial growth. The thermal input of the oscillation additive is higher than the two‐pass multilayer additives, and the Laves phase also precipitated more. The maximum tensile strength occurs in parallel sampling close to the substrate, which is 693.5 ± 12.6 and 751.2 ± 17.6 MPa in oscillation and two‐pass multilayer modes, respectively. The maximum elongation is obtained in the vertical direction is 60 ± 1.0% and 60 ± 1.1%. The anisotropies are 4% and 4.5%, respectively. The maximum hardness value under the two torch trajectories also appears close to the substrate.

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Microstructure evolution during indentation of Inconel-718 created by additive manufacturing

Cited by 9 publications

References 27 publications

Effect of Prior Surface Textures on the Resulting Roughness and Residual Stress during Bead-Blasting of Electron Beam Melted Ti-6Al-4V

Effect of Prior Surface Textures on the Resulting Roughness and Residual Stress during Bead-Blasting of Electron Beam Melted Ti-6Al-4V

Thermal Diffusivity Characteristics of the IN718 Alloy Tested with the Modified Pulse Method

Microstructure and Mechanical Properties of Thick‐Walled Inconel 625 Alloy Manufactured by Wire Arc Additive Manufacture with Different Torch Paths

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