Healing of Fatigue Crack by High-Density Electropulsing in Austenitic Stainless Steel Treated with the Surface-Activated Pre-Coating

Atsushi Hosoi, Tomoya Kishi, Yang Ju*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

A technique to heal a fatigue crack in austenitic stainless steel SUS316 by applying a controlled, high-density pulsed current was developed. A surface-activated pre-coating (SAPC), which eliminates the oxide layer and coats a Ni film on the crack surface, was used to improve the adhesion between crack surfaces. Cracks were observed by scanning electron microscopy before and after the application of high-density electropulsing. To evaluate the healing effect of the SAPC during crack propagation, fatigue tests were conducted under a constant stress intensity factor. The fatigue crack treated with the SAPC was found to be effectively healed as a result of electropulsing, and also showed a slower rate of crack propagation.

Original languageEnglish
Pages (from-to)4213-4225
Number of pages13
JournalMaterials
Volume6
Issue number9
DOIs
Publication statusPublished - 2013 Sep

Keywords

  • Coating
  • Crack
  • Electropulsing
  • Fatigue
  • Healing
  • Propagation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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