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Hydrogen Embrittlement of Additively Manufactured Inconel 718

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Precipitation hardenable nickel alloys are commonly used in oil and gas offshore structures where requires outstanding mechanical strength and corrosion resistance. In seawater galvanic coupling to steel or cathodic protection promotes the formation of atomic hydrogen on the surface of Inconel 718. Hydrogen atoms further dissolve into the metal matrix and cause hydrogen embrittlement. The unconventional Additive Manufacturing (AM) process generates fine microstructure and alters surface finish that affect hydrogen intake process and the subsequent hydrogen embrittlement. The effects of hydrogen embrittlement are investigated on different build orientations and surface finish of AM Inconel 718 by slow strain rate (SSR) testing in seawater environment under cathodic protection. The susceptibility of AM 718 to hydrogen embrittlement is discussed based on the SSR results and metallography analysis with respect to its wrought counterpart.

Product Number: 51319-13453-SG
Author: Liu Cao
Publication Date: 2019
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51314-3948-Hydrogen Embrittlement Susceptibility of Precipitation Hardened Ni-Alloys

Product Number: 51314-3948-SG
ISBN: 3948 2014 CP
Author: Carlo Malara
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Picture for Susceptibility to Hydrogen Induced Stress Cracking of Alloy 718 and Alloy 725 Under Cathodic Polarization
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Susceptibility to Hydrogen Induced Stress Cracking of Alloy 718 and Alloy 725 Under Cathodic Polarization

Product Number: 51315-5597-SG
ISBN: 5597 2015 CP
Author: Gaute Stenerud
Publication Date: 2015
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 A test project to examine the susceptibility of Hydrogen Induced Stress Cracking (HISC) has been executed. In this project hydrogen charged samples of Alloy 718 and Alloy 725 have been exposed under tensile stress to establish critical stress levels for initiation of HISC.
Picture for Hydrogen Embrittlement of High Strength Precipitation Hardenable Nickel Alloys
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Hydrogen Embrittlement of High Strength Precipitation Hardenable Nickel Alloys

Product Number: 51319-13161-SG
Author: Michael Dodge
Publication Date: 2019
$20.00

The high strength and corrosion resistance of nickel-chromium alloys such as Alloy 718 and nickel-iron-chromium alloys such as Alloys 945 and 945X make them particularly good candidates for use in demanding environments in the upstream oil and gas industry. These materials generally perform well where resistance to sulphide stress cracking and chloride stress corrosion cracking is required. However whilst these alloys are considered ‘NACE compliant' environmentally-assisted failures can still occur.It is generally accepted that for hydrogen cracks to initiate there must be a critical combination of stress susceptible microstructure and hydrogen concentration. In this project the effect of microstructure is explored by heat treating Alloy 718 945 and 945X to standard and non-standard conditions. Tensile specimens were slow-strain-rate-tested in air and under CP to explore sensitivity to hydrogen embrittlement. Finally the effect of a severe stress concentration in the form of a sharp notch was used to determine whether there is an enhanced susceptibility to hydrogen embrittlement due to the presence of local stress raisers. The results are compared with tests undertaken by other authors under various hydrogen-charging conditions.
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