Abstract
In recent years there has been a need for materials that sustain satisfactorily at higher temperature in automobile exaust emission control systems. In order to select the materials for such cyclic services, scaling resistance of a number of commercial heat resisting steels have been investigated for long period under cyclic heating in air between 800 and 1200°C.
Oxidation behavior is dependent upon both microstructure and chemical composition of alloys. The ferritic alloys exhibit better resistance to scaling than the austenitic alloys. Fe-Cr-Al alloys show excellent oxidation resistance at high temperature, but deformation of specimen occurs. Austenitic alloys show a general trend of improved resistance to scaling with increasing Cr, Ni and Si contents. 18-8 stainless steels bearing a small amount of Ti or Nb plus Ta show also improved resistnance.
