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Cathodic hydrogen charging of Inconel 718

Materials Science and Applied Mathematics, Malmö University, Sweden

The nickel based superalloy IN718 is known to be prone to hydrogen sensitivity, causing degradation of its mechanical properties. Therefore, during mechanical testing of hydrogen charged samples, a well-defined hydrogen distribution is essential to better understand the influence of hydrogen on dislocation movement and plasticity behavior. The possibility of charging cylindrical specimens of IN718 with hydrogen using cathodic charging is investigated. The method is based on an electro-chemical process using a molten salt electrolyte. The resulting hydrogen concentration is measured for various radii, and it is shown that the anisotropic diffusion coefficient resulting from electromigration, inherent in the charging method, must be taken into account as it has a major impact on the charging parameters of IN718. Also, no evidence of degassing during storage is found. Further, changes in surface roughness were examined by SEM, and only limited surface degradation is observed, which is not considered to significantly affect the results.
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Keywords nickelbased superalloys; cathodic hydrogen charging; hydrogen concentration profile; hydrogen diffusion; electromigration

Citation: Niklas Ehrlin, Christina Bjerkén, Martin Fisk. Cathodic hydrogen charging of Inconel 718. AIMS Materials Science, 2016, 3(4): 1350-1364. doi: 10.3934/matersci.2016.4.1350


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This article has been cited by

  • 1. M. P. LaCoursiere, D. K. Aidun, D. J. Morrison, Slow Strain Rate Testing for Hydrogen Embrittlement Susceptibility of Alloy 718 in Substitute Ocean Water, Journal of Materials Engineering and Performance, 2017, 10.1007/s11665-017-2675-x
  • 2. Niklas Ehrlin, Martin Fisk, Christina Bjerkén, Flow stress model for hydrogen degraded Inconel 718, Mechanics of Materials, 2018, 10.1016/j.mechmat.2018.01.007

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