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The Effect of Surface Condition on Primary Water Stress Corrosion Cracking Initiation of Alloy 600

  • S. R. PembertonEmail author
  • M. A. Chatterton
  • A. S. Griffiths
  • S. L. Medway
  • D. R. Tice
  • K. J. Mottershead
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Stress corrosion cracking (SCC) initiation tests have been conducted on Alloy 600 in simulated PWR primary water (PW) with the aim of understanding the effect of surface condition produced by different machining methods on the time to initiation. Surface roughness, residual stress and cold work were characterised using profilometry, X-ray diffraction (XRD), micro-hardness and electron backscatter diffraction (EBSD). Initiation tests used tensile, button-headed specimens manufactured from 15% cold rolled, low temperature annealed Alloy 600 to relate machining parameters to PWSCC initiation susceptibility. Tests were conducted at 360 °C with active loading corresponding to 1% plastic strain. The onset of initiation was detected by in situ direct current potential drop (DCPD) measurement. Results indicate that residual stress and orientation of the crack plane in relation to cold work are critical parameters for Alloy 600 PWSCC initiation susceptibility. This suggests that knowledge of surface roughness cannot be used as the sole acceptance criteria for surface condition with regard to PWSCC susceptibility.

Keywords

Nickel based alloys Stress corrosion cracking SCC initiation testing PWR 

References

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • S. R. Pemberton
    • 1
    Email author
  • M. A. Chatterton
    • 1
  • A. S. Griffiths
    • 1
  • S. L. Medway
    • 1
  • D. R. Tice
    • 1
  • K. J. Mottershead
    • 1
  1. 1.Amec Foster WheelerWarringtonUK

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