Modelling of the degradation of martensitic stainless steels by the Boudouard reaction
Numerical modelling of the degradation of P92 and VM12 martensitic stainless steels in gaseous (i) 70% CO2-30%H2O and (ii) Ar-50%CO2 at 550 °C is reported, emphasising the formation of duplex oxide scale and internal carburisation. A 1D numerical model is presented for the evolution of mult...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
2020
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| Summary: | Numerical modelling of the degradation of P92 and VM12 martensitic stainless steels in gaseous (i) 70% CO2-30%H2O and (ii) Ar-50%CO2 at 550 °C is reported, emphasising the formation of duplex oxide scale and internal carburisation. A 1D numerical model is presented for the evolution of multiphase regions, subject to a Robin-type boundary condition representing a Boudouard surface reaction. The surface reaction kinetics at the spinel/substrate interface and the carbon transport kinetics in the substrate result in unusual carbon concentration profiles, measured here by glow-discharge optical emission spectroscopy (GDOES). Analysis of experimental data indicates that moisture decreases the rate of the surface reaction, despite higher carbon activity of the gas. |
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