METAL DUSTING OF 9-20-PERCENT CR STEELS IN INCREASED PRESSURE ENVIRONMENTS AT 560(DEGREES)C

The susceptibility of steels to catastrophic failure by metal dusting is known to depend upon the activity of the carburising environment, a lloy chromium content, grain size, surface condition and temperature. This paper presents results of first tests investigating the influence of gas pressure on metal dusting of 9-20% Cr containing steels, by in creasing the test gas pressure to approximately five bar over atmosphe ric pressure. Cross-sectional micrographs show attack morphologies suc h as intergranular and internal carbide formation, as well as the clas sic uniform and pitting types of attack.