Physical and mechanical characteristics of EP741 and EP99 high-temperature nickel alloys in high-pressure hydrogen gas |
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| Affiliation: | 1. Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany;2. Department of Materials, University of Oxford, Parks Road, OX1 3PH, Oxford, UK;3. Institut Pprime, Physics and Mechanics of Materials Department, UPR CNRS 3346, ISAE-ENSMA, 1 avenue Clément Ader, BP 40109, 86961 Futuroscope-, Chasseneuil, France;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;3. Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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| Abstract: | This paper presents research of the hydrogen gas effects on physical and mechanical properties of the precipitation-hardened nickel alloys EP741 and EP99 at pressures up to 65 MPa and temperatures up to 840°C. It has been shown that conventional yield strength, tubular-shaped sample fracture stress and long-term strength are not practically affected by hydrogen. The characteristics of alloy ductility are more susceptible to hydrogen effect. EP741 alloy is especially susceptible to the hydrogen environment effect at temperature of 460°C, and EP99—at temperatures of 20°C and 460°C. Hydrogen permeability relationships for alloys in a wide range of temperature and pressure were obtained. |
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