Fe-Ni 合金の高温酸化

概要

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The oxidation of five Ni-Fe alloys with Ni of 5-50% has been studied in air at 800∿1300℃ for 15∿120 min. The scales consisted of the external scale and the subscale. The external scales had stratified structures of either α-Fe_2O_3/Fe_3O_4 or α-Fe_2O_3/Fe_3O_4/(FeO+Fe_3O_4), depending on the conditions such as the nickel contents in the alloy, the oxidation temperature and the time of exposure. Their thicknesses decreased with increasing nickel contents in the alloys. FeO grew with a characteristic shape in the scales of the 5∿30% Ni alloys oxidized at 1000∿1200℃. The subscales consisted of the metal/oxide mixed zone and the intergranular attacked zone. Morphological studies showed that the subscale was formed by the very local oxidation at the grain boundaries and at the alloy/mixed zone interface. Both zones grew according to the parabolic rate law. The effect of nickel contents in the alloy on the subscale growth rate was studied. On the basis of the above results, the aspects of the oxidation of Fe-Ni alloys were discussed.
社団法人日本鉄鋼協会の論文
1981-09-01