研究論文
Fe-25Cr-12Ni耐熱鋳鋼の高温酸化について
1983 年 55 巻 3 号 p. 143-148
詳細
1983 年 55 巻 3 号 p. 143-148
Fe-25%Cr-12%Ni cast steels and Co-base alloy were oxidized by linearly increasing temperature and by isothermal heating at different temperatures in air, and tested by thermobalance and EPMA. Approximate temperature ranges, in which the alloy can be used, were found by linearly increasing temperature in a single try at oxidation. Using the result obtained, available temperature limit could be defined and a comparison of oxidation resistance could be made by a few isothermal oxidation tests. Addition of rare earth metals (0.2%and 1.0%) reduced the oxidation rate of the cast steel below 1,100°C, but caused catastrophic oxidation above 1,200°C. On the other hand, Co-base alloy behaved in a similar manner with the rare earth-free cast steel, but was superior in heat-resisting property. The oxidation resistance of the Co-base alloy was superior to that of the rare earth-containing cast steel at 1,200°C, but was inferior below 1,100°C.
