Oxidation of Type 310S stainless steel in mixed gases at elevated temperatures.

摘要

Sheet specimens of Type 310S stainless steel were exposed to air as well as to ''lean'' and ''rich'' sulfidizing atmospheres at temperatures near 900(degrees)C to determine the relationships that exist between the scale structure, the rate of reaction, and the stresses generated during exposure. One goal of this experimental research program was to examine how these factors might be related to the breakdown of protective scales in sulfidizing atmospheres. It was found that the scales formed in air and the ''lean'' atmosphere are protective and non-spalling while those formed in the ''rich'' atmosphere spall, initially react at rates 1000 times greater than counterparts in less aggressive atmospheres, and later exhibit a ''breakaway''-type rapid reaction. Only those scales formed in air provide the cooperative, tractive interfacial forces required to produce uniform dilatation and deformation of the substrate. However, evidence exists for at least localized stresses in all of the scales examined.