ABSTRACT The effects of roughness and two‐step process temperature on the growth of Al 2 O 3 film on Fe‐45Ni‐25Cr‐4Al based alumina forming austenitic (AFA) alloy under low oxygen pressure have been studied. Under oxidation process (850°C/5 h) of low‐temperature step of the two‐step process, a continuous Al 2 O 3 film forms on ground surface of AFA alloy, whereas a Cr 2 O 3 film develops on polished AFA alloy surfaces. The mechanism of forming Al 2 O 3 film on ground surface has been clarified. In addition, the high‐temperature step of the two‐step process critically promotes the growth of the protective Al 2 O 3 film. When the oxidation temperature is excessively high (1100°C), it causes wrinkled Al 2 O 3 film morphology, leading to film cracking and spallation. Conversely, insufficient oxidation temperature (900°C) leads to incomplete film coverage due to inadequate growth of the Al 2 O 3 film. The optimal oxidation temperature of 1000°C produces a continuous, dense, and well‐adhered Al 2 O 3 protective film. The influence of high temperature on oxide film growth morphology modification and internal stress has been analyzed.
Xiao et al. (Mon,) studied this question.
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