Potential Resistance of Alloy 82 Dissimilar Metal Welds to Primary Water Stress Corrosion Cracking
36th Annual CNS-CNA Student Conference - 2012 June 12


Presented at:
36th Annual CNS-CNA Student Conference
2012 June 12
Location:
Saskatoon, Canada
Session Title:
CNS/CNA Student Conference 2012

Authors:
Suraj Persaud (University of Toronto )
Roger Newman (University of Toronto )
  

Abstract

Joints between carbon steel and Alloy 600, containing Alloy 82 weld metal, were exposed to a steam-hydrogen environment considered to simulate exposure to primary water conditions in nuclear power plants. A potentially protective external iron oxide film formed on the inner surface of the component. However, the chromium content throughout the weld is below that which would form an external chromium oxide. The results indicate that low chromium content could allow for internal oxidation below the external iron oxide which could increase susceptibility to primary water stress corrosion cracking (PWSCC) compared with an otherwise similar alloy, such as Alloy 800.

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