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Oxidation Behavior around the Stress Corrosion Crack Tips of Alloy 600 under PWR Primary Water Environment
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  • Journal title : Corrosion Science and Technology
  • Volume 11, Issue 4,  2012, pp.141-150
  • Publisher : The Corrosion Science Society of Korea
  • DOI : 10.14773/cst.2012.11.4.141
 Title & Authors
Oxidation Behavior around the Stress Corrosion Crack Tips of Alloy 600 under PWR Primary Water Environment
Lim, Yun Soo; Kim, Hong Pyo; Hwang, Seong Sik;
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 Abstract
Stress corrosion cracks in Alloy 600 compact tension specimens tested at in a simulated primary water environment of pressurized water reactor were analyzed by analytical transmission electron microscopy and secondary ion mass spectroscopy (SIMS). From a fine-probe chemical analysis, oxygen was found on the grain boundary just ahead of the crack tip, and chromium oxides were precipitated on the crack tip and the grain boundary attacked by the oxygen diffusion, leaving a Cr/Fe depletion (or Ni enrichment) zone. The oxide layer inside the crack was revealed to consist of a double (inner and outer) layer. Chromium oxides existed in the inner layer, with NiO and (Ni,Cr) spinels in the outer layer. From the nano-SIMS analysis, oxygen was detected at the locations of intergranular chromium carbides ahead of the crack tip, which means that oxygen diffused into the grain boundary and oxidized the surfaces of the chromium carbides. The intergranular chromium carbide blunted the crack tip, thereby suppressing the crack propagation.
 Keywords
Alloy 600;PWSCC;TEM;SIMS;grain boundary;oxygen diffusion;
 Language
Korean
 Cited by
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