| Oxidation behavior of 321 stainless steel was studied. After solution treatment, specimens were polished up to 1㎛ Al₂O₃ grade and then subjected to oxidation treatment in dry air of 500∼1200℃. TEM, ESCA, SEM and EDS were used to study oxidation behavior. According to the results of TEM analysis after 500℃ oxidation treatment, it was found that thin amorphous Fe oxide was formed on the surface and polycrystalline (Cr, Fe)₂O₃ was formed below the amorphous Fe oxide layer. For the specimen oxidized at 1200℃, Ti was detected at oxide island on large oxide scale of 321 stainless steel, and it was concluded that Ti has negligible effect on resistance to oxidation. Most of Ni was detected at the interface between metal and (Cr, Fe)₂O₃, and between Fe₂O₃ and (Cr, Fe)₂O₃. (Received July 21, 1998) |
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