Abstract
Pores are often observed in magnetite, a major oxidation product of ferritic/martensitic steels. Due to the detrimental effects of pores on the stability of the oxide and the detrimental effect of an unstable oxide on an engineering structural material's performance, understanding the mechanism and location of the formation of porosity is critical. A methodology is developed in the present study to predict the pore location based on the diffusion mechanism of Fe in magnetite. This methodology is illustrated with an important engineering ferritic/martensitic steel HCM12A which is exposed to supercritical water. The predicted results are in good agreement with the experimental results. The location of pores is found to be roughly dependent upon oxygen partial pressure but not upon exposure time. This methodology can be used as an intelligent guide to control environment parameters such as oxygen partial pressure, and thus control the occurrence and location of pores.
| Original language | English |
|---|---|
| Pages (from-to) | 4234-4242 |
| Number of pages | 9 |
| Journal | Corrosion Science |
| Volume | 48 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 2006 |
| Externally published | Yes |
Funding
The authors would like to thank Mark Anderson, Kumar Sridharan, Yun Chen and Xiaowei Ren for their contribution in the SCW test of the samples. This work is supported by the Idaho National Engineering and Environmental Laboratory as part of the Department of Energy Generation IV Initiative.
Keywords
- B. Modelling studies
- C. Kinetic parameters
- C. Oxidation
- C. Thermodynamic diagrams
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