Determination of stress corrosion cracking (SCC) susceptibility (KISCC) at imposed potentials using a novel circumferential notch tensile (CNT) technique

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Abstract

A fracture mechanics based technique has been employed for determination of susceptibility of engineering materials to stress corrosion cracking (SCC) and threshold stress intensity factor for (K Iscc) using small circumferential notch tensile (CNT) specimens. This relatively new technique was tested successfully on mild steel at free corrosion potential (E corr) in 12.5 M NaOH at 150°C. The K Iscc has been determined to be 27.7 MPa.m 1/2. In order to establish the application of the CNT technique in understanding the mechanistic aspects of caustic cracking, tests have also been performed under the imposed electrochemical potentials. When the test was performed at a controlled potential in the active-passive transition region (E a-p) the specimen failed extremely quickly than the specimens tested at E corr employing similar K I. The other test was conducted under an imposed potential in the passive region (E p) and the specimen did not fail even after relatively very long exposure time. The fractography of the specimens tested at E corr and E a-p presented evidence of SCC, i.e., intergranular crack propagatation. The experimental CNT testing is a simple, relatively fast and cost-advantageous approach for generating the K Iscc data.

Original languageEnglish
Title of host publication45th Annual Conference of the Australasian Corrosion Association 2005
Subtitle of host publicationCorrosion and Prevention 2005
Pages273-279
Number of pages7
Publication statusPublished - 1 Dec 2005
EventAustralasian Corrosion Association (ACA) Conference 2005: Corrosion and Prevention - Gold Coast, Australia
Duration: 20 Nov 200523 Nov 2005
Conference number: 45th

Conference

ConferenceAustralasian Corrosion Association (ACA) Conference 2005
Abbreviated titleCP 2005
CountryAustralia
CityGold Coast
Period20/11/0523/11/05

Keywords

  • Circumferential notched tensile (CNT) specimen
  • Imposed potential
  • Stress corrosion cracking (SCC)
  • Stress intensity factor (K )
  • Threshold stress intensity factor (K )

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