Evaluation of a Diffusion/Trapping Model for Hydrogen Ingress in High Strength Alloys

Abstract

The ingress of hydrogen in three precipitation-hardened alloys (inconel 718, Incoloy 925, and 18Ni maraging steel) and titanium (pure and grade 2) was studied using a potentiostatic pulse technique. Anodic current transients were obtained for these materials in an acetate buffer (1 mol L-i HAc/1 mol L-1 NaAc where Ac = acetate). The data for the Ni-containing alloys and Ti grade 2 were shown to fit a diffusion/trapping model under interface control, and values were determined for the irreversible trapping constants (k) and the flux of hydrogen into the alloys. The absence of hydrogen ingress in the case of pure titanium indicates that the surface oxide is an effective barrier to hydrogen entry. Keywords: Inconel 718, 18Ni maraging steel Incoloy 925, Titanium; Hydrogen ingress; Diffusion/trapping model; Hydrogen trapping. (JES)

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Document Details

Document Type
Technical Report
Publication Date
Nov 17, 1989
Accession Number
ADA215528

Entities

People

  • Bruce G. Pound

Organizations

  • SRI International

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alloys
  • Chemical Reactions
  • Diameters
  • Diffusion
  • Diffusivity
  • Elements
  • Embrittlement
  • Films
  • Grain Boundaries
  • High Strength Alloys
  • Hydrogen Embrittlement
  • Maraging Steels
  • Materials
  • Mechanical Properties
  • Metals
  • Resistance
  • Steel

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.