Abstract
Oxidation behavior at high temperatures of the stainless steel( SUS304L ) powder compacts produced by MG (mechanical grinding) process and then hot pressing were studied. The results obtained are as follows;
(1)The compact with MG treatment developes fine grain structure, and shows improved oxidation resistance.
(2)The oxide film without MG treatment is composed of two layers ;the inner layer is spinel with the composition of Fe(FeCr)2O4 and the outer layer Fe3O4. On the other hand, the oxide film with MG treatment is composed of a thin but fine layer contained chromium oxide layer.
(3)The rapid diffusion of chromium to the surface along many grain boundaries produced by MG treatment results in the formation of the fine chromium oxide at early oxidation and then improved oxidation resistance.
