Hydrogen diffusivity measurement and microstructural characterization of Custom 465 stainless steel

S. Ifergane, E. Sabatani, B. Carmeli, Z. Barkay, V. Ezersky, O. Beeri, N. Eliaz

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Hydrogen diffusivity in Custom 465® martensitic precipitation hardened stainless steel is determined using electrochemical permeation tests. Hydrogen diffusivity in the solution annealed (SA) condition is approximately 10 times higher than in the aged H900 (480 °C, 4 h) condition because of hydrogen traps such as Ni3Ti nano-precipitates and reverted austenite. The microstructure of the alloy is characterized by TEM, XRD and ESEM/EBSD, both in the aged H900 and in the SA conditions. In the aged condition, η-Ni3Ti nano-precipitates with hexagonal structure and a rod-like shape are observed. In addition, reverted austenite is found at grain boundaries and inter-lath interfaces. In the SA condition, these microstructural features are not evident, which may explain the higher diffusivity measured. The diffusivity is almost unaffected by prior microplastic deformation of H900.

Original languageEnglish
Article number25484
Pages (from-to)494-503
Number of pages10
JournalElectrochimica Acta
Volume178
DOIs
StatePublished - 1 Oct 2015

Keywords

  • Custom 465
  • Effects of strain
  • Hydrogen diffusion
  • Hydrogen permeation
  • Precipitation hardening stainless steel

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Electrochemistry

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