ODS--310合金的高温氧化行为

摘要

采用静态氧化增重实验及扫描电镜、能谱分析和 X 射线衍射分析等手段,研究了 ODS-310合金在高温环境下的氧化行为,分析了氧化层的形貌、成分和物相,并对其高温氧化动力学曲线进行拟合.实验发现各个温度下的氧化动力学曲线均基本符合抛物线规律.在700℃和900℃氧化100 h 以后,ODS-310合金均表现出优异的抗氧化性能.但是,当氧化温度为1100℃时,氧化层厚度明显增厚,而且氧化层有疏松和不连续的现象,不利于氧化层对基体的保护.氧化程度随着氧化温度的提高和氧化时间的延长而加剧.通过能谱和 X 射线衍射综合分析可知氧化层的物相为 Cr2 O3.%The high temperature oxidation behavior of oxide dispersion strengthened 310 ( ODS-310) alloy was investigated by oxidation test. The morphology, composition and phase of the oxidation layer were analyzed by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. It is found that the oxidation kinetic curves at all the temperatures approximately obey the parabolic law. After oxidizing at 700 and 900 ℃ for 100 h, the alloy shows a good resistance to oxidation. But after oxidizing at 1100 ℃ , the oxide layer becomes thicker with the phenomenon of porosity and discontinuousness, which is harmful to the oxidation resistance. The oxidation degree of the alloy increases with the rising of temperature and the prolonging of time. Energy dispersive spec-troscopy and X-ray diffraction analysis results indicate that the phase of the oxide layer is Cr2 O3 .