Determination of the threshold stress intensity factor (K Iscc) of 4340 steel using small circumferential notched tensile (CNT) specimens

R. Rihan, R. K. Singh Raman, R. N. Ibrahim, D. Gerrard

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A novel fracture mechanics technique has been employed for the determination of threshold stress intensity factor (K Iscc) for stress corrosion cracking (SCC) using small circumferential notch tensile (CNT) specimens. The technique was applied successfully for testing SCC susceptibility of heat treated 4340 steel in 3.5% sodium chloride solutions at room temperature. The KIscc has been determined to be 15 MPa.m 1/2, which is very close to K Iscc values obtained by others using standard specimens. The fracture surfaces have been examined by scanning electron microscopy (SEM) in order to identify the evidence of chloride stress corrosion cracks.

Original languageEnglish
Title of host publication46th Annual Conference of the Australasian Corrosion Association 2006
Subtitle of host publicationCorrosion and Prevention 2006
Number of pages8
Publication statusPublished - 1 Dec 2006
EventAustralasian Corrosion Association (ACA) Conference 2006: Corrosion and Prevention - Hobart, Australia
Duration: 19 Nov 200622 Nov 2006
Conference number: 46th


ConferenceAustralasian Corrosion Association (ACA) Conference 2006
Abbreviated titleCP 2006


  • 4340 steel
  • Circumferential notched tensile (CNT) Specimen
  • Sodium chloride (NaCl)
  • Stress corrosion cracking (SCC)
  • Stress intensity factor (K )
  • Threshold stress intensity factor (K )

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