Understanding and detecting early stages of SCC initiation in sensitized stainless steel by means of electrochemical potential transients

S. K. Bidhar, Y. Watanabe, H. Tsukui T, Uchimoto

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)

Abstract

Series of slow strain rate tests (SSRT) were conducted on moderately sensitized austenitic stainless steel in diluted aqueous solution of sodium thiosulfate at ambient temperature and pressure. Only a small area of the test piece was exposed to test solution and electrochemical potential transients obtained during the straining was used to detect an initiation or a precursor event of stress corrosion crack (SCC). Tests were stopped intermittently after getting potential transients, so as not to allow crack to propagate and to observe the morphology of very initial stage of SCC initiation site. Visual observation by scanning electron microscope (SEM) before and after the test shows direct correlation between electrochemical transient of certain characteristic to the crack initiation. SEM observation shows δ- ferrite in the alloy as one of the preferential SCC initiation site for typical electrochemical transient. Attempt was made to calculate the charge associated with crack initiation event from potential transient using dummy anode test.

Original languageEnglish
Pages (from-to)2387-2390
Number of pages4
JournalKey Engineering Materials
Volume353-358
Issue numberPART 4
DOIs
Publication statusPublished - 2007 Jan 1
EventAsian Pacific Conference for Fracture and Strength (APCFS'06) - Sanya, Hainan Island, China
Duration: 2006 Nov 222006 Nov 25

Keywords

  • Electro-chemical noise
  • Inclusions
  • Initiation site
  • Stainless steel
  • Stress corrosion cracking

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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