The Study of Microstructure and Oxidation Behavior at 1,173K of Austenitic Stainless Steels by Cr and Ni Addition

Abstract

This work aim to study the e↵ect of Chromium and Nickel addition to improve the oxidation behavior of austenitic stainless steels at 1,173 K. The results show that Chromium addition provide the best oxidation resistance property, similar to the case of Nickel addition, which can increase the oxidation resistance of the austenitic stainless steels. However, the composite of Chromium and Nickel addition case o↵ers the lowest oxidation resistance. The results from XRD shows that the compositions of oxide scale change from Cr2O3 to Cr2O3, Fe2O3, NiFe2O4 and Ni(Cr2O4). The oxidation behavior follows the parabolic rate law; W = ktn, where W = weight gain (g/cm2), t = time (s), k is the exponential rate constant and n is the exponent of growth rate. The n values are between 0.31-0.97.