Identification of Mo-Rich M23C6 Carbides in Alloy 718

Aghajani, Ali; Tewes, Jürgen; Parsa, Alireza B.; Hoffmann, Thorsten; Kostka, Alexander; Kloewer, Jutta

doi:10.1007/s11661-016-3593-5

Cited by 21 publications

(14 citation statements)

References 83 publications

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“…It is also used by the automobile industry to manufacture high performance turbocharger rotors and exhaust system components, aerospace industry for gas turbine blades, combustors and seals, and engine combustion chamber to operate at high pressure (6.9MPa) and high temperatures [44]. [46]. The Laves phases were the largest phase of all; contained at least 10%Nb, although a very large percentage of 35%Nb in Laves was reported [47].…”

Section: Inconel 718mentioning

confidence: 99%

“…Aging of IN718's γ phase would form the δ, γ' and γ" precipitates (Figure 18). Compositions of the δ precipitate was reported as Ni3Nb, and those for the γ' and γ" precipitates were Ni3(Al, Ti) and Ni3Nb respectively [46,49]. The δ precipitates, typically needle shape of few-micron long, were formed primarily at grain boundaries and contained at least 6-8% Nb.…”

Section: Inconel 718mentioning

confidence: 99%

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Testing Techniques and Fatigue of Additively Manufactured Inconel 718 – A Review

Balasubramanian

Philpott²,

Hyder³

et al. 2020

IJEMM

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Additive Manufacturing (AM) of metallic components shows unfavorable properties in their as-built state; surface roughness, anisotropy, residual stresses, and internal /surface defects are common issues that affect dynamic properties of AM metals. This paper reviews traditional fatigue testing techniques, summarizes published fatigue data for wrought and additively manufactured metals with focus on Inconel 718. Surface and volume defects of AM metals were presented and how post processing techniques could improve fatigue performance were shown. Different methods for normalizing fatigue data were explored due to varying results of different fatigue testing techniques.

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Section: Inconel 718mentioning

confidence: 99%

Section: Inconel 718mentioning

confidence: 99%

Testing Techniques and Fatigue of Additively Manufactured Inconel 718 – A Review

Balasubramanian

Philpott²,

Hyder³

et al. 2020

IJEMM

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“…The austenitic matrix in alloy 718 is strengthened by the intermetallic precipitates γ (L1 2 structure, Ni 3 (Al,Ti)) and γ (DO 22 structure, Ni 3 Nb) produced by precipitation hardening. The amount and shape of these precipitates depends predominantly upon the hardening temperature and time used to establish the desired strength in the material [13]. In addition, these microstructural particularities play also a role on the cracking resistance of alloy 718 [14,15].…”

Section: Introductionmentioning

confidence: 99%

On the Influence of the Microstructure upon the Fatigue and Corrosion Fatigue Behavior of UNS N07718

Engler¹,

Klapper

Oechsner³

2021

Metals

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Due to the challenging operational conditions occurring during drilling, e.g., in the oil and gas industry, the corrosion fatigue (CF) behavior of materials used in drillstring components needs to be well understood. The combination of cyclic mechanic loads and a corrosive environment can affect significantly the integrity of a material, which has to be taken into account when selecting and qualifying materials for drilling equipment. Nickel alloys such as the precipitation-hardenable alloy 718 (UNS N07718) are widely used in many industrial applications including subterranean drilling. In the present study, the fatigue and CF behavior of alloy 718 in three different metallurgical conditions was investigated. The CF behavior of the different conditions was determined using customized rotating bending machines enabling testing in a simulated drilling environment at 125 °C. Results have shown that the fatigue and CF strength of alloy 718 is affected by its microstructural particularities, for instance, the amount of strengthening phases and δ-phase.

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“…Further heating of adjacent regions in L-PBF led to aging of the γ phase to form δ precipitates, and other γ' and γ" precipitates. Compositions of the δ precipitate was reported as Ni3Nb, that for the Laves was (Ni, Cr, Fe) (Nb, Mo, Ti), and those for the γ' and γ" precipitates were Ni3(Al, Ti) and Ni3Nb respectively [10,11]. The δ precipitates, typically needle shape of few-micron long, were formed primarily at grain boundaries and contained at least 6-8% Nb.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Polishing of Extruded and Laser Powder-Bed-Fused Inconel 718

Jain

Hyder²,

Corliss³

et al. 2021

IJEMM

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Electro-chemical polishing (ECP) was utilized to produce sub-micron surface finish on Inconel 718 parts manufactured by Laser Powder-Bed-Fusion (L-PBF) and extrusion methods. The L-PBF parts had very rough surfaces due to semi-welded powder particles, surface defects, and difference layer steps that were generally not found on surfaces of extruded and machined components. This study compared the results of electro-polishing of these differently manufactured parts under the same conditions. Titanium electrode was used with an acid-based electrolyte to polish both the specimens at different combinations of pulsed current density, duty cycle, and polishing time. Digital 3D optical profiler was used to assess the surface finish, while optical and scanning electron microscopy was utilized to observe the microstructure of polished specimens. At optimal condition, the ECP successfully reduced the surface of L-PBF part from 17 Âµm to 0.25 Âµm; further polishing did not improve the surface finish due to different removal rates of micro-leveled pores, cracks, nonconductive phases, and carbide particles in 3D-printed Inconel 718. The microstructure of extruded materials was uniform and free of processing defects, therefore can be polished consistently to 0.20 Âµm. Over-polishing of extruded material could improve its surface finish, but not for the L-PBF material due to defects and the surrounding micro-strain.

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Identification of Mo-Rich M23C6 Carbides in Alloy 718

Cited by 21 publications

References 83 publications

Testing Techniques and Fatigue of Additively Manufactured Inconel 718 – A Review

Testing Techniques and Fatigue of Additively Manufactured Inconel 718 – A Review

On the Influence of the Microstructure upon the Fatigue and Corrosion Fatigue Behavior of UNS N07718

Electrochemical Polishing of Extruded and Laser Powder-Bed-Fused Inconel 718

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