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Study of Phase Distribution on Alloy UNS N07718 in Different Hardening Conditions and Its Relationship With Hydrogen Embrittlement Susceptibility

The precipitation-hardenable Nickel Alloy UNS(1) N07718 is one of the most commonly applied alloy in the oil and gas industry. Enriched with amounts of niobium molybdenum titanium and aluminum this alloy is known as having good corrosion resistance in sour gas applications while presenting excellent strength properties.The austenitic matrix of g phase is strengthened by the intermetallic precipitates g‘ (ordered FCC Ni3Al phase) and g‘‘ (body-centered tetragonal Ni3Nb phase). Co-precipitates can also be observed.Studies have been carried out in order to compare and better understand the hydrogen embrittlement resistance of three different aging conditions of N07718. Different VIM/VAR commercial heats were age hardened under the standard ageing temperature range to produce a minimum 120 ksi yield strength material under a lower temperature that is responsible for optimizing the mechanical properties (to produce a minimum 140 ksi yield strength material) or under a two-step heat treatment that gives to the material improved mechanical properties (minimum 150 ksi yield strength) when compared to the single-step heat treatment.The interaction of hydrogen with the microstructure has been evaluated by means of hydrogen embrittlement susceptibility tests and structural characterization by neutron diffraction and small angle neutron scattering techniques.

Product Number: 51319-13025-SG
Author: Julia Botinha
Publication Date: 2019
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