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SiO_2颗粒层,这些尺寸较小的SiO_2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。
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.
出处
《铸造技术》
北大核心
2017年第7期1547-1550,共4页
Foundry Technology
基金
国家重点研发计划资助项目(2016YFC0801904)
