Diffusion and trapping of hydrogen due to elastic interaction with η-Ni3Ti precipitates in Custom 465® stainless steel

Mati Shmulevitsh, Sigalit Ifergane, Noam Eliaz, Roni Z. Shneck

Research output: Contribution to journalArticlepeer-review

Abstract

Since it is difficult to determine the local distribution of hydrogen in alloys experimentally, it is desired to estimate it theoretically. Here, the effect of elastic stresses around η-Ni3Ti precipitates in Custom 465® martensitic age-hardenable stainless steel on the distribution of hydrogen and its diffusivity in the matrix is evaluated. A comparison is made to recent experimental data. The calculations are based on the solution of the stresses associated with coherent precipitates in the framework of linear elasticity combined with expressions for hydrogen concentration and diffusion in the presence of stress. Local compressive and tensile hydrostatic stresses form around the η-Ni3Ti precipitate, resulting in regions of reduced or increased hydrogen concentration, respectively. The integrated effect is an increased average hydrogen concentration, in agreement with the experimental results. The equilibrium concentration of hydrogen due to the elastic stresses decreases with increasing temperature, in conformance with experimentally measured temperature programmed desorption (TPD) data. This quantitatively confirms that the coherency stresses of the precipitate in the peak-aged condition increase the concentration of absorbed hydrogen and decrease its diffusivity.

Original languageEnglish
Pages (from-to)31610-31620
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number59
DOIs
StatePublished - 29 Nov 2019

Keywords

  • Custom 465®
  • Elastic fields
  • Hydrogen concentration
  • Hydrogen diffusion
  • Hydrogen trapping
  • Martensitic age-hardenable stainless steel

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