Si含量对Fe-Si合金渗碳处理组织和性能的影响  

The Effect of Si-Contents on the Microstructures and Properties of Fe-Si Alloy Carburized Layer

作　　者：李艳霞[1] 刘芳 张巨成[1] 

机构地区：[1]北华航天工业学院材料工程系,河北廊坊065000 [2]北京北机机电工业有限责任公司,北京101109

出　　处：《北华航天工业学院学报》2013年第2期10-13,共4页Journal of North China Institute of Aerospace Engineering

基　　金：北华航天工业学院科研基金项目(KY-2010-14)

摘　　要：以Fe-Si二元合金为基体进行表面渗碳处理,研究了Si含量对渗碳层组织、硬度及耐磨性的影响。结果显示基体中的Si原子在渗碳过程中氧化形成SiO2沿奥氏体晶界分布,随Si含量增加,SiO2含量增加并呈连续网状分布。渗碳处理后Fe-Si合金表面硬度在64HRC以上,硅原子对渗碳过程产生阻碍作用,渗碳有效硬化层深度随Si含量增加显著降低。干摩擦条件下Fe-Si合金渗碳层抗平面滑动摩擦磨损性能随Si含量增加逐渐提高,Fe-3%Si合金耐磨性高于高铬铸铁。Binary Fe-Si alloys with different Si-contents were carburizing treated. The effect of Si-contents on the microstructure, hardness and the wear resistance of the carburized layer were studied. The results show the constituents of SiO2 form along the inter- face of the austenite phase during the carburizing treatment. The fraction of SiO2 increases with the adding of the Si-contents in the matrix and it gradually trends to distribute into the continuous network. After carburizing treatment, the surface hardness of Fe-Si al- loys is beyond 64HRC. The hardening layer depth decreases with the Si-contents adding due to the hindering effect of the Si atoms to the carburization. The wear resistance in the dry sliding condition of Fe-Si alloys improves as the Si-contents increase, the wear resis- tance of Fe-3% Si alloy is better than the high chromium cast iron.

关 键 词：FE-SI合金 渗碳 SIO2 耐磨性 

分 类 号：TG156.8[金属学及工艺—热处理]