CORROSION AND STRESS CORROSION CRACKING OF 310 STAINLESS STEEL IN SUPERCRITICAL WATER
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16


Presented at:
The 5th International Symposium on SuperCritical Water-cooled Reactors
2011 March 13-16
Location:
Vancouver,Canada
Session Title:
Materials VI (SCC)

Authors:
Yashar Behnamian (University of Alberta)
Jingli Luo (University of Alberta)
Weixing Chen (University of Alberta)
Wenyue Zheng (Natural Resources Canada)
David Guzonas (Atomic Energy of Canada Limited)
Zhangjian Zhou (University of Science and Technology Beijing)
Xuehai Tan (University of Alberta)
David Mitlin (University of Alberta)
  

Abstract

In the present study, the effect of exposure duration on the corrosion and stress corrosion cracking of 310 stainless steel tube in a supercritical water environment was investigated at 500 oC in a decreasing dissolved oxygenregime.Oxide films formedthreedistinct layers after exposure to SCW for 2500 hours.On the outer layer, large magnetite crystals were observed which were tiny on the surface after exposed for 500 hours.Inthe middle-oxide layer, the concentrations ofiron, chromium and nickel were close tothose in the substrate. In the inner layer, chromium was enriched while iron was depleted. With increasing exposure duration, the thickness of the oxide layer increased. In the sub-layers of magnetite crystals, some iron-deficient regionswere seen because of the selective outward diffusion of iron.Some micro cracks started to form from those iron-deficient regions.

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