Abstract
AbstractThe effects of (0·5-2%)Si and (0 or ∼0·4%)Al contents in a low alloy steel ingot on high temperature oxidation in a simulated combustion atmosphere (N2-6·55CO2-18·84H2O-3·75O2) at 1050°C have been investigated. The experimental methods include thermogravimetric tests and analyses of oxidation products. The results indicate that the major oxidation kinetics obeyed a parabolic rate law, and diffusion of Fe2+ in the FeO layer was the rate controlling step. Increase in Si content decreased oxidation, because the FeO + Fe2SiO4 layer between the scale and the substrate became more compact or thicker. The effect of Al depended upon the Si content. At 0·5%Si, alloying with Al reduced the oxidation due to the segregation of FeAl2O4 at the scale/base metal interface. At 1%Si, Al promoted oxidation due to the doping effect of p type semiconducting oxide by small amounts of Al3+. At 1·5 and 2%Si, Al did not affect oxidation.
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