Fe_3Al基合金的高温氧化行为

HIGH TEMPERATURE OXIDATION BEHAVIOR OF Fe 3Al BASED ALLOYS

:测定了Fe3Al基合金的静态和拉应力态下的氧化增重曲线 ,并与 0Cr2 5Al5合金进行比较。结果表明 ,在较低温度下 ,Fe3Al基合金的静态氧化性能不如 0Cr2 5Al5;当温度高于 90 0℃时 ,Fe3Al基合金的氧化性能要比 0Cr2 5Al5好。但Fe3Al基合金在拉应力作用下的动态氧化性能比0Cr2 5Al5差。动态下合金的氧化增重不仅与温度和氧化时间有关 ,还与拉应力的大小有关。文中给出了近似的动态氧化方程 :Δw =k1 t3/ 2 +k2 t1 / 2 。

Mass gain curves of Fe 3Al based alloys oxidized in static state or under external tensile stress were studied and compared with those of 0Cr25Al5. It was observed that the static oxidation resistance of Fe 3Al based alloys was similar to that of 0Cr25Al5 at low temperature, but better than 0Cr25Al5 above 900℃;and dynamic oxidation resistance of Fe 3Al based alloys was a little worse than that of 0Cr25Al5. Mass gain of alloys was not only dependent on temperature and oxidization time, but also on external tensile stress. A dynamic oxidation equation, Δw=k 1t 3/2 +k 2t 1/2 , was concluded, and was in accordance with the experimental results.