Solution Treatment Study of Inconel 718 Produced by SLM Additive Technique in View of the Oxidation Resistance

Calandri, Michele; Manfredi, Diego; Calignano, Flaviana; Ambrosio, Elisa Paola; Biamino, Sara; Lupoi, Rocco; Ugues, Daniele

doi:10.1002/adem.201800351

Cited by 51 publications

(30 citation statements)

References 54 publications

(64 reference statements)

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“…The e in the as-built condition usually exhibits epitaxial growth of columnar grains columnar or cellular dendrites along the built direction, owing to the high cooling rates process (10 6 K/s [19,26]) and the heat dissipation direction, i.e., vertically through the 21,27]. et al [25,28] studied the microstructure of IN718 parts fabricated by PBF-LB in as-built treated conditions, revealing carbides, Laves phases, and segregations; therefore, heat e crucial to homogenize the microstructure. Li et al [13] studied the microstructure of phase) rich in Ni, Cr, and Fe, which is strengthened by the precipitation of metastable Metals 2019, 9, x FOR PEER REVIEW semifinished or finished products in the aerospace, automo industries [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Calandri et al [25,28] semifinished or finished products in the aerospace, automotive, biomedical/medical, and energy industries [6][7][8][9][10]. Diverse metals AM techniques exist, and the most adopted in the industry are Powder Bed Fusion (PBF) and Directed Energy Deposition (DED), as for the classification by the ISO/ASTM 52900 (2015) international standard.…”

Section: Introductionmentioning

confidence: 99%

“…Calandri et al [25,28] studied the microstructure of IN718 parts fabricated by PBF-LB in as-built and post-heat treated conditions, revealing carbides, Laves phases, and segregations; therefore, heat treatments are crucial to homogenize the microstructure. Li et al [13] studied the microstructure of an IN718 sample after SA plus DA heat treatments, varying the SA temperature from 940 • C to 1060 • C. In the as-built condition, performance components, for example, turbine blades, aerospace parts, and energy power plants.…”

Section: Introduction Of Intermetallic Compounds and Metal Matrix Commentioning

confidence: 99%

“…. [25,28] studied the microstructure of IN718 parts fabricated by PBF-LB in as-built ed conditions, revealing carbides, Laves phases, and segregations; therefore, heat cial to homogenize the microstructure. Li et al [13] studied the microstructure of ', and δ precipitates in the heat-treated condition, and observed the presence of δ phase in heat-treated condition with SA at 1065 • C. Furthermore, and high cooling rates [12].…”

Section: Introduction Of Intermetallic Compounds and Metal Matrix Commentioning

confidence: 99%

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Laser Powder Bed Fusion of Inconel 718: Residual Stress Analysis Before and After Heat Treatment

Barros

Silva

Gouveia

et al. 2019

Metals

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Residual stresses (RS) of great magnitude are usually present in parts produced by Laser Powder Bed Fusion (PBF-LB), mainly owing to the extreme temperature gradients and high cooling rates involved in the process. Those "hidden" stresses can be detrimental to a part's mechanical properties and fatigue life; therefore, it is crucial to know their magnitude and orientation. The hole-drilling strain-gage method was used to determine the RS magnitude and direction-depth profiles. Cuboid specimens in the as-built state, and after standard solution annealing and ageing heat treatment conditions, were prepared to study the RS evolution throughout the heat treatment stages. Measurements were performed on the top and lateral surfaces. In the as-built specimens, tensile stresses of~400 MPa on the top and above 600 MPa on the lateral surface were obtained. On the lateral surface, RS anisotropy was noticed, with the horizontally aligned stresses being three times lower than the vertically aligned. RS decreased markedly after the first heat treatment. On heat-treated specimens, magnitude oscillations were observed. By microstructure analysis, the presence of carbides was verified, which is a probable root for the oscillations. Furthermore, compressive stresses immediate to the surface were obtained in heat-treated specimens, which is not in agreement with the typical characteristics of parts fabricated by PBF-LB, i.e., tensile stresses at the surface and compressive stresses in the part's core.Diverse metals AM techniques exist, and the most adopted in the industry are Powder Bed Fusion (PBF) and Directed Energy Deposition (DED), as for the classification by the ISO/ASTM 52900 (2015) international standard. These two techniques use a laser or an electron beam as a high energy density source to selectively melt the material and build the parts [3][4][5][6][7]. Actually, different nomenclatures are used for the same process. Laser Powder Bed Fusion (PBF-LB) is also known as Selective Laser Melting (SLM), Direct Metal Laser Sintering (DMLS), and Laser Cusing [7,8,11], depending mostly on the AM systems supplier.Focusing on PBF-LB, a micro-size powder is spread in thin layers of 20 and 50 µm [3], and then a laser beam guided by a galvanometric mirror selectively melts the deposited material according to the CAD model. The parts are built progressively from bottom to top, also known as the building direction (vertical) [7,11]. The use of support structures is common, either to support down-facing surfaces or to prevent part distortion. Part distortion occurs due to the large residual stresses (RS) generated during material solidification layer-by-layer, owing to the extreme temperature gradients and high cooling rates [12].New feedstock materials dedicated to AM systems have been developed; thereby, new opportunities will arise in the near future of AM [13]. Stainless steel; tool steel; and Ni-, Al-, Ti-, Co-Cr-, and Cu-based alloys are just a few of the metallic materials currently available for AM [7,14,15]. Introduction of int...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introduction Of Intermetallic Compounds and Metal Matrix Commentioning

confidence: 99%

Section: Introduction Of Intermetallic Compounds and Metal Matrix Commentioning

confidence: 99%

See 2 more Smart Citations

Laser Powder Bed Fusion of Inconel 718: Residual Stress Analysis Before and After Heat Treatment

Barros

Silva

Gouveia

et al. 2019

Metals

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“…Sanviemvongsak et al [55] concluded that EBM, LBM and wrought Inconel 718 followed quasi-parabolic oxidation rates. Other studies [59] [60] found that SLM Inconel 718 specimens exposed for extended time ranges at 850°C have a parabolic oxidation rate resulted from the formation of a dense, protective, and stable oxide scale on the surface of the alloy.…”

Section: Oxidation Of Ni-based Superalloys and Inconel 718mentioning

confidence: 93%

Oxidation Resistance of Additively Manufactured Inconel 718 for Gas Turbine Applications

Singh¹

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This research investigates the oxidation behaviour of an additively manufactured (AM) superalloy Inconel 718 and compares its oxidation performance to that of wrought Inconel 718. A plasma arc additive manufacturing process was developed and utilized to manufacture the AM specimens. All specimens were subjected to exposures at 800°C and 900°C. The oxidized specimens were analysed using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). Both surface oxide and cross-section microstructure were examined, in addition to microstructure changes in the substrate. The results showed that the two alloys had similar weight changes over the periods of 50-400 hours at both temperatures. However, the microstructure changes on the surface and in the substrate were different. The thickness of the chromia oxide scale formed on AM Inconel 718 was consistently thinner than that on the wrought specimens. There was also more internal oxidation on the AM specimens, particularly after longer exposure at high temperature. In addition, the formation of a subscale Nb-rich layer was observed between outer chromia and substrate on all specimens, except on the AM specimens exposed to 800°C for 100 hours, this layer contributed to the integrity of the chromia oxide layer. Based on the preliminary results, it was concluded that the AM material, when exposed to 900°C, had slightly inferior oxidation performance than the wrought alloy, attributable a thicker and more stable chromia oxide layer and to less internal oxidation. I would like to thank Carleton University and the Department of Mechanical Engineering for giving me the opportunity to perform this research I want to thank my advisor, Dr. Xiao Huang, for her support, insight, patience and encouragement during this process. I would like to thank all of my friends and family members for their continued support and cheering me on when things were tough. I would like to thank my parents, Mario and Roxana, and my fiancé Eduardo for being a constant source of love and encouragement, and never letting me give up. Lastly, to my dear sister. You are awesome and you are the best.

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Pseudobinary Phase Diagrams of Eutectic Reaction for Pt‐containing and Pt‐free 718Plus Alloys

et al. 2021

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The pseudobinary phase diagrams of Pt-containing and Pt-free 718Plus alloys are constructed to better understand how Pt affects the eutectic reaction. The phase transition temperature is obtained by differential scanning calorimetry (DSC). The compositions of γ phase, eutectic phase, and Laves phase are obtained by energy dispersive spectrometry (EDS). Nb is set as the independent variable in the phase diagram as Nb is the most susceptible to concentration of eutectic phase during solidification. The reliability of the pseudobinary phase diagrams is verified by the results reported. According to the diagrams, on one hand, Pt increases the concentration of Nb required for the (Laves þ γ) eutectic reaction by increasing lattice space. On the other hand, the increased concentration of Nb and the slow diffusion rates of Pt and Nb cause the decrease in the temperature of the eutectic reaction. As a result, the eutectic point in the pseudobinary phase diagram moves down and shift to the right. Herein, experimental data are provided for enriching the phase diagram of 718Plus alloy.

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Solution Treatment Study of Inconel 718 Produced by SLM Additive Technique in View of the Oxidation Resistance

Cited by 51 publications

References 54 publications

Laser Powder Bed Fusion of Inconel 718: Residual Stress Analysis Before and After Heat Treatment

Laser Powder Bed Fusion of Inconel 718: Residual Stress Analysis Before and After Heat Treatment

Oxidation Resistance of Additively Manufactured Inconel 718 for Gas Turbine Applications

Pseudobinary Phase Diagrams of Eutectic Reaction for Pt‐containing and Pt‐free 718Plus Alloys

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