【摘要】 通过X射线衍射（XRD）、扫描电镜（SEM）及能谱分析（EDS）等手段对不同Si含量的铁基高温合金1 250℃下的抗氧化性能进行了研究。结果表明,1 250℃下,铁基高温合金抗氧化性能与Si含量的关系由优至劣的顺序是:0.93%Si>0%Si>2.76%Si>1.40%Si。含0.93%Si的铁基高温合金具有好的抗氧化性能的原因是,Si在基体与其致密的氧化膜之间形成了弥散分布的SiO₂颗粒层,这些尺寸较小的SiO₂颗粒与其氧化膜紧密连接犹如楔子般起着钉扎氧化膜的作用,改善了氧化膜的粘附性,进而提高了材料的抗氧化性能。更多还原

【Abstract】 The oxidation resistance of iron-based superalloy with different Si content at 1 250 ℃ was studied using XRD,SEM and EDS techniques. The results show that the sequence of oxidation resistance of the iron-based superalloys at 1 250 ℃ from superior to inferior is 0.93% Si > 0% Si > 2.76% Si > 1.40% Si. The reason for the outstanding oxidation resistance of iron-based superalloy with 0.93%Si is that dispersively distributed SiO₂ particle layer is formed between the matrix and its compact oxide film. These small SiO₂ particles join the oxide film closely and play a role of pinning as chocks, which improves the adhesion property of oxide film, and thus the oxidation resistance of the material is improved.更多还原