On the role of precipitates in hydrogen trapping and hydrogen embrittlement of a nickel-based superalloy

Zhenbo Zhang, Katie Moore, Greg Mcmahon, Roberto Morana, Michael Preuss

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Abstract

Here we report imaging of hydrogen/deuterium concentrations in δ phase and carbonitrides, and at their interfaces with the matrix in a nickel-based superalloy using Nanoscale Secondary Ion Mass Spectrometry. It is found that δ phase attracts a higher concentration of hydrogen than the matrix during cathodic charging, while carbonitrides adsorb much less. No hydrogen segregation was observed at the interfaces. Detailed electron microscopy analysis of the H-charged samples after tensioning to failure demonstrates that the higher vulnerability of δ in hydrogen induced cracking is largely attributed to its higher capacity in hydrogen adsorption, and vice versa for carbonitrides.
Original languageEnglish
Pages (from-to)58-69
Number of pages12
JournalCorrosion Science
Volume146
Early online date30 Oct 2018
DOIs
Publication statusPublished - Jan 2019

Keywords

  • nickel-based superalloy
  • hydrogen embrittlement
  • NanoSIMS
  • hydrogen adsorption
  • precipitates
  • Nickel-based superalloy
  • Precipitates
  • Hydrogen embrittlement
  • Hydrogen adsorption

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