High-temperature kinetics study of 430L steel powder oxidized in air at 600-850℃

摘要

The 430L stainless steel powder with a mean particle size of 95 mu m was studied to determine its high-temperature oxidation properties. Continuous thermogravimetric measurements were carried out for 100 h in air at temperatures in the range of 600-850 degrees C. Even though a considerable amount of Cr (up to (similar to)5 wL% Cr) inside the grains was depleted - especially inside small grains - no breakaway oxidation was observed. This indicates that both the remaining Cr and the formed chromia scale remained protective with regard to the metallic core until the Cr concentration reached very low levels.