Abstract
The oxidation behavior at 800°C in air of an austenitic stainless Fe14.29Mn5.57Si8.23Cr4.96Ni (wt.%) shape memory alloy was investigated by thermogravimetry, OM, SEM (EDS), XRD, GAXRD, TEM, and DSC. The results showed that its oxidation process obeys a parabolic law. After 100h exposure, the oxide scales are composed of outer Mn2O3, middle Mn3O4, and inner MnCr2O4. A ferrite layer exists between the oxidation layer and matrix. The ferrite results from the transformation of oxidation-induced Mn-depleted layer, and its thickness increases with increasing oxidation time. Profuse chi phase precipitates inside matrix and at the interface between matrix and ferrite layer.
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