Superalloy 718: Evolution of the Alloy from High to Low Temperature Application

Patel, Saurabh K.; deBarbadillo, J.J.; Coryell, Stephen

doi:10.1007/978-3-319-89480-5_2

Cited by 19 publications

(3 citation statements)

References 26 publications

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“…The bottom of TFGS is fixed to the cryostat base through 26 high strength fasteners, namely heavy gauge M60 and M85 threaded bolts issued from forged rods of UNS N07718 (also known as Inconel® 718). UNS N07718 is a high strength nickel base superalloy, submitted to a double ageing treatment, following the ASTM A1014 requirements, that confers to the alloy the proper combination of high strength and stress-rupture ductility, including at cryogenic temperature [2]. Composition limits are also per ASTM A1014 with additional restrictions for Co (≤ 0.01%) and Ta (≤ 0.05%).…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of a heavy gauge fastener of the ITER toroidal field gravity support system

Sgobba

Santillana

Buchanan

et al. 2023

Fusion Engineering and Design

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Section: Introductionmentioning

confidence: 99%

Failure analysis of a heavy gauge fastener of the ITER toroidal field gravity support system

Sgobba

Santillana

Buchanan

et al. 2023

Fusion Engineering and Design

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“…Fe–Ni–Cr alloy is generally used in cracking furnace tubes, such as HP40, HK20, 35Cr45Ni, etc. Fe–Ni–Cr alloy has excellent mechanical properties under high-temperature environments and is widely used in steam cracking aerospace, nuclear power, and other fields. − Since coking on the inside of the furnace tube of Fe–Ni–Cr alloy significantly increases the pressure and affects the heat transfer of cracking gas from the furnace tube, the cracking furnace has to be shut down periodically for decoking, resulting in a considerable adverse effect on the economics of the process . Therefore, coking on the inner surface of the cracking furnace tube is the limiting bottleneck in steam cracking technology.…”

Section: Introductionmentioning

confidence: 99%

Preoxidation Film and Its Anticoking Behavior on an Optimized HP40Nb Alloy with Al, Zr, Y Addition

Liu,

et al. 2023

ACS Appl. Eng. Mater.

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To reduce the coking of steam-cracking furnace tubes, an anticoking oxide film is formed by preoxidation. In this paper, the effect of the preoxidation process on the oxidation behavior of Fe-35Ni-25Cr alloy is studied, and its coking resistance is analyzed. The results show that oxidized at 650 °C; the oxidation product is M 2 O 3 ; After oxidation at 1000 °C, the oxide layer is three layers of spinel, Cr-rich M 2 O 3, and Al 2 O 3 . After two steps of oxidation, the oxidation products are spinel, Al-rich M 2 O 3 and Al 2 O 3 . The coking resistance of the oxide film is analyzed. The results show that the surface coking amount of oxide film formed by two-step oxidation method is the least. The oxide layer formed by oxidation at 1000 °C has a spalling phenomenon. More coke is deposited on the surface of the preoxidized film at 650 °C, while filamentous coke appears on the surface of the unoxidized alloy.

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“…The precipitation-hardenable nickel iron chromium alloy 718 (UNS N07718) was originally developed for use in power generation [3]. The exceptional combination of high strength, thermal stability, and excellent corrosion resistance has led to its successful application in other industrial sectors including O&G [3][4][5][6][7][8], aerospace [9,10] and military applications [11]. The chemical, microstructural and mechanical properties of alloy 718 for O&G applications are specified in API standard 6ACRA [12], where three different yield strength levels ranging between 827 and 1034 MPa are defined.…”

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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Superalloy 718: Evolution of the Alloy from High to Low Temperature Application

Cited by 19 publications

References 26 publications

Failure analysis of a heavy gauge fastener of the ITER toroidal field gravity support system

Failure analysis of a heavy gauge fastener of the ITER toroidal field gravity support system

Preoxidation Film and Its Anticoking Behavior on an Optimized HP40Nb Alloy with Al, Zr, Y Addition

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

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