Continuous monitoring of back wall stress corrosion cracking growth in sensitized type 304 stainless steel weldment by means of potential drop techniques

Y. Sato, T. Atsumi, T. Shoji

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Stress corrosion cracking (SCC) tests on welded specimens of sensitized type 304SS with a thickness of 20 mm were performed in sodium thiosulphate solution at room temperature, with continuous monitoring of the SCC growth, using the techniques of modified induced current potential drop (MICPD), alternating current potential drop (ACPD) and direct current potential drop (DCPD). The MICPD and DCPD techniques permit continuous monitoring of the back wall SCC, which initiates from a fatigue pre-crack at a depth of about 4 mm, from which it propagates through more than 80% of the specimen thickness. The MICPD technique can decrease the effect of the current flowing in the direction of the crack length by focusing the induced current into the local area of measurement using induction coils, so that the sensitivity of the continuous monitoring of the back wall SCC is higher than that of the ACPD and DCPD techniques.

Original languageEnglish
Pages (from-to)274-283
Number of pages10
JournalInternational Journal of Pressure Vessels and Piping
Volume84
Issue number5
DOIs
Publication statusPublished - 2007 May 1

Keywords

  • Continuous monitoring
  • Potential drop
  • Sensitized stainless steel
  • Stress corrosion cracking

ASJC Scopus subject areas

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

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