Abstract
Austenitic stainless steels find application in heat exchangers, furnace parts, exhaust systems and other such high temperature applications because of their good corrosion resistance at elevated temperatures. This is believed to be because of a passive film of α-Cr2O3 that forms on the surface. Silicon is usually added to afford better scaling resistance. The steel under investigation (AISI # 31000) has minor alloying additions of manganese, silicon and titanium in addition to chromium(25 wt%) and nickel(20 wt%).Annealed and polished 3 mm discs as well as bulk specimens were oxidized at temperatures between 700°C and 900°C in dry oxygen at low pressure. Kinetic studies were performed using a CAHN 1000 microbalance. The 3 mm discs were back-thinned for TEM studies while the bulk specimens were used for SEM observations.
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