Abstract
The oxidation behaviour of an austenitic stainless Fe–14.29Mn–5.57Si–8.23Cr–4.96Ni (wt%) shape memory alloy was investigated in air at 600 °C and 700 °C. The results showed that the oxidation process obeyed the parabolic rate law at both temperatures. At 700 °C, the final oxide scales were composed of an outer Mn2O3 layer, a middle Mn3O4 layer, and an inner MnCr2O4 layer. The scale consisted of only Mn2O3 at 600 °C. A composite structure of ferrite and austenite phases was obtained after oxidation at 600 °C and 700 °C because an oxidation-induced Mn-depleted layer formed.
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