AMPP Store - Products tagged with 'uns n07718'

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Fitness-for-Purpose Testing of UNS R30003, UNS R30035, UNS N07718 and UNS N09946 in Environment with H2S, CO2, and High-Chlorides

Product Number: 51324-20839-SG

Author: Noelle Easter C. Co; Ravi M. Krishnamurthy; Kenneth George; Bjørn-Andreas Hugaas; Ragnar Marcelius Fredriksen

Publication Date: 2024

$40.00

Critical equipment in high pressure high temperature (HPHT) oil and gas wells are commonly made of superalloys. Components in these wells require both high strength and corrosion resistance. In this study, four superalloys: Elgiloy (UNS R30003), MP35N (UNS R30035), Alloy 718 (UNS N07718) and 945X (UNS N09946) were tested in an environment with H2S, CO2, and high chlorides. Four-point bend tests were performed with N07718 and UNS N09946 materials while three-point bend tests were done on UNS R30003 and UNS R30035 in an autoclave with pH2S of 0.025 bar and pCO2 16.6 bar, and 308 g/L Cl- at 363°F for 30 days. Neither cracking nor pitting was observed on any of the four-point or three-point bend specimens. In addition to four-point bend testing, slow strain rate tests were performed on UNS N07718 and UNS N09946 materials. Results of the slow strain rate test showed no significant decrease in ductility in either UNS N09946 or UNS N07718. However, UNS N09946 performed better than UNS N07718 in a high chloride environment based solely on SSRT results.

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Hydrogen Embrittlement Resistance of Oil Patch Alloy 718 and Its Correlation to the Microstructure

Product Number: 51321-16393-SG

Author: Julia Botinha/Bodo Gehrmann/Helena Alves

Publication Date: 2021

$20.00

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Influence of the Hardening Phases on the Hydrogen Embrittlement Susceptibility of Ni-Alloys based on UNS N07718

Product Number: 51320-14667-SG

Author: Julia Botinha, Bodo Gehrmann, Helena Alves

Publication Date: 2020

$20.00

The Alloy UNS(1) N07718 is among the most used alloys in the oil and gas industry. Due to the presence of the alloying elements niobium, aluminum and titanium, this alloy is precipitation hardenable by the formation of the phases Gamma’ and Gamma’’. Although presenting excellent strength properties and good resistance in sour gas applications, this material is known to be susceptible to hydrogen embrittlement and most field failures are related to this limiting property.

The use of Alloy 718 (UNS N07718) for oil & gas applications is regulated by the API(2) 6ACRA1 standard and it is available in three different grades, the 120K, with minimum 120 ksi yield strength, the 140K, with minimum 140 ksi yield strength, and the 150K, with minimum 150 ksi yield strength. Previous studies showed that, due to the different hardening heat treatment parameters, each of the available grades presents a different precipitation behavior in terms of distribution and amount of precipitates, and the obtained microstructure is directly related to the resistance of the material to hydrogen embrittlement.

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Influence Of The Surface Condition On The Pitting And SCC Resistance Of Alloy UNS N07718 Produced Via Selective Laser Melting

Product Number: 51321-16949-SG

Author: Madison Woolridge; Christoph Wangenheim; Helmuth Sarmiento Klapper

Publication Date: 2021

$20.00

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Initiation Sites of Pitting Corrosion in the Nickel Alloy UNS N07718

Product Number: 51323-18846-SG

Author: Julia Botinha, Bodo Gehrmann, Helena Alves, Michael Rohwerder

Publication Date: 2023

$20.00

Being one of the most applied nickel alloy in the oil and gas industry, the UNS N07718 (Alloy 718) is mainly composed by nickel, chromium, iron, molybdenum, niobium, titanium and aluminum. UNS N07718 is used in the solution annealed and precipitation hardened condition, where a complex microstructure is formed, which is responsible for its very good mechanical properties, as well as its cracking and corrosion resistance.

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Material Capabilities Of Additively Manufactured Alloy UNS N07718 In An H2S-Containing Environment

Product Number: 51322-17938-SG

Author: Wei Chen, Thomas Dobrowolski, Satya Ganti, Tim Haeberle, Aaron Avagliano, Anjani Achanta

Publication Date: 2022

$20.00

AM brings significant benefits in better performance, inventory management, and lifecycle cost reduction to the Oil & Gas industry. Both manufacturers and users are working towards AM qualification and standardization in order to realize and sustain these benefits. Starting at the product level, the goal is to ensure the product is sound in its form, fit, and function, and free from macroscopic (surface, sub-surface, internal) anomalies deleterious to its performance. Product qualification is supported by a foundational metallurgical or AM material qualification.¹

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Microstructure Characterization Of Additively Manufactured Alloy 718

Product Number: 51323-19419-SG

Author: Liu Cao, Dian Li, Sydney Fields, Yufeng Zheng

Publication Date: 2023

$20.00

Alloy UNS N07718 (hereafter abbreviated as 718) is one of the most versatile precipitation-hardened nickel-based corrosion-resistant alloys (CRAs) used for both surface and sub-sea components in oil and gas production service. API 6ACRA provides heat treatment windows and acceptance criteria for 718 in these oil and gas production environments, in which the heat treatment is intended to homogenize the microstructure and obtain the correct microstructure for targeting the desired mechanical properties. For fabricating high temperature materials via additive manufacturing (AM), alloy 718 is a primary focus due to its widespread applications in the past 60 years and excellent weldability in either age hardened or annealed condition.

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Performance Of Additively Manufactured Alloy 718 In Sour Service

Product Number: 51322-18029-SG

Author: Liu Cao, Christopher Taylor

Publication Date: 2022

$20.00

Alloy UNS N07718 (hereafter abbreviated as 718) is one of the most versatile precipitation-hardened nickel-based corrosion-resistant alloys (CRAs) used for both surface and sub-sea components in oil and gas production service. API 6ACRA¹ provides heat treatment windows and acceptance criteria for 718 in these oil and gas production environments, in which the heat treatment is intended to obtain high strength and to minimize the formation of δ-phase at grain boundaries. As pointed out in NACE MR0175 Part 3² (Table 1), field failures of 718 components in sour service are primarily related to stress corrosion cracking (SCC) at elevated temperatures and hydrogen embrittlement in the lower temperature range. The latter is specifically called galvanically induced hydrogen stress cracking (GHSC or GIHSC), which is typically caused by atomic hydrogen uptake from galvanic corrosion or cathodic protection (CP) when 718 is used with steel components in a seawater environment. CP is normally used to protect steel component from corrosion in subsea environments.

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Understanding the Influence of Surface Condition on the Fatigue and Corrosion Fatigue Behavior of SLM718

Product Number: 51324-21234-SG

Author: Helmuth Sarmiento Klapper; Nils Holzapfel; Wei Chen; Juan Carlos Flores

Publication Date: 2024

$40.00

Selective laser melting (SLM) is a widely used additive manufacturing (AM) process, also for producing components using precipitation-hardenable nickel alloy 718 (UNS N07718). SLM has been largely accepted into many industries including oil and gas (O&G) with current research efforts focused on demonstrating materials performance in demanding applications including directional drilling and reservoir characterization tools. A broader applicability of additively manufactured UNS N07718 in such applications is currently conditioned by characterization efforts limited to corrosion testing on machined surfaces, which are not representative of the surface resulting from SLM process. The lack of understanding regarding the influence of as-printed surface conditions for UNS N07718 produced via SLM on fatigue and corrosion fatigue limits its applicability to the machined surface condition, thus negating benefits gained during the manufacturing process. In this research work, the fatigue and corrosion fatigue behavior of additively manufactured UNS N07718 in as-printed conditions was investigated. Besides fatigue in air at ambient temperature, corrosion fatigue of SLM718 was tested in alkaline 5 M chloride-containing brines at 125 °C to simulate a typical drilling environment. Experimental results have shown that as-printed surfaces of SLM718 are significantly more prone to fatigue and corrosion fatigue compared to machined surfaces. Besides increased surface roughness the presence of near-surface defects typical of AM can be seen as the reason for the observed fatigue behavior.

Products tagged with 'uns n07718'

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