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51314-3948-Hydrogen Embrittlement Susceptibility of Precipitation Hardened Ni-Alloys

Picture for Hydrogen Embrittlement Susceptibility of Precipitation Hardened Ni-Alloys
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Product Number: 51314-3948-SG
ISBN: 3948 2014 CP
Author: Carlo Malara
Publication Date: 2014
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Hydrogen embrittlement of precipitation hardened Ni- alloys is receiving increasing attention by the oil and gas industry. Several component failures have been imputed to this phenomenon. In this context an R&D test program has been implemented to evaluate the susceptibility to hydrogen embrittlement of the following products: 935 (UNS N09935) alloy with 110 ksi Minimum Yield Strength (MYS) 825PH (UNS N09925) alloy with 110 ksi MYS 718 (UNS N07718) alloy with 120 ksi MYS and with 140 ksi MYS 7716 (UNS N07716) alloy with120 ksi MYS and with 140 ksi MYS. These materials were characterized in terms of chemical analysis mechanical properties and microstructure. They were tested for susceptibility to hydrogen embrittlement according to a procedure issued by Total. Both 7716 grades resulted to be highly susceptible to hydrogen embrittlement Both 718 grades 935 and 825PH resulted not susceptible to this phenomenon. Test results are discussed as a function of the material properties. The precision of the test procedure is also assessed.
Hydrogen embrittlement of precipitation hardened Ni- alloys is receiving increasing attention by the oil and gas industry. Several component failures have been imputed to this phenomenon. In this context an R&D test program has been implemented to evaluate the susceptibility to hydrogen embrittlement of the following products: 935 (UNS N09935) alloy with 110 ksi Minimum Yield Strength (MYS) 825PH (UNS N09925) alloy with 110 ksi MYS 718 (UNS N07718) alloy with 120 ksi MYS and with 140 ksi MYS 7716 (UNS N07716) alloy with120 ksi MYS and with 140 ksi MYS. These materials were characterized in terms of chemical analysis mechanical properties and microstructure. They were tested for susceptibility to hydrogen embrittlement according to a procedure issued by Total. Both 7716 grades resulted to be highly susceptible to hydrogen embrittlement Both 718 grades 935 and 825PH resulted not susceptible to this phenomenon. Test results are discussed as a function of the material properties. The precision of the test procedure is also assessed.
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Hydrogen Embrittlement of High Strength Precipitation Hardenable Nickel Alloys

Product Number: 51319-13161-SG
Author: Michael Dodge
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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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51316-7459-Hydrogen-Assisted Failure in Ni-Based Superalloy 718

Product Number: 51316-7459-SG
ISBN: 7459 2016 CP
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Product Number: 51300-11116-SG
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