摘要
设计了一种新型的铁基二元合金—Fe-3%Si合金,并对其进行表面渗碳处理。借助于SEM、XRD、EPMA、硬度测定及摩擦实验等分析手段,研究了合金渗碳层的组织及其性能。结果表明:Fe-3%Si合金渗碳层组织中形成大量SiO2颗粒,基体主要由马氏体和残余奥氏体组成。渗碳初期,Si元素促进了碳在奥氏体中扩散并有利于奥氏体稳定性提高。但氧原子沿奥氏体晶界扩散并与晶界及其附近的Si结合形成网状SiO2,阻碍碳原子进一步扩散.渗碳处理后的Fe-3%Si表面硬度达到66 HRC,干摩擦条件下抗平面滑动摩擦磨损性能优于高铬铸铁。
A Fe-3% Si alloy was fabricated and carburized. Microstructure and properties of the carburized layer were studied by means of SEM, XRD, EMPA, hardness testing and friction experiment. The results show that the microstructure of the carburized layer is mainly consisted of SiO2 particles,martensite matrix and retained austenite. Si element promotes the diffusion of carbon atom in austenite at the early stage of carburization and is advantageous to the austenite stability. The oxygen atoms diffuse along the grain boundaries of austenite and react with silicon to form dense SiO2 particle at austenite grain boundaries and nearby, which hinders the further diffusion of carbon atom. Hardness of that of Fe-3% Si alloy after carburization is 66HRC and the wear resistance in the dry sliding condition is better than that of high chromium cast iron.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第4期172-176,共5页
Transactions of Materials and Heat Treatment
关键词
铁硅合金
渗碳
SIO2
颗粒
摩擦
磨损
iron silicon alloy
carburization
SiO2particle
friction
wear
