摘要
以Fe/Cr/C粉末为添加原料,采用可控电子束旋转线扫描方式对低碳钢表面进行表面改性。通过电子束加热工艺和粉末配比的优化,在表面复合层中原位合成了(Cr,Fe)7C3。对表面复合层的显微组织及室温干滑动磨损性能进行了分析。结果表明,表面复合层中主要包含两种相,即少量的初生硬化相(Cr,Fe)7C3以及奥氏体与(Cr,Fe)7C3组成的共晶相,共晶碳化物弥散分布于奥氏体基体中,呈不连续网状组织。表面复合层与基体之间为完全冶金结合。复合层与GCr15钢球的磨损机理为磨料磨损,在室温干滑动磨损下具有优异的耐磨损性能。
Fe/Cr/C powder mixtures were employed to modify the surface of a low carbon steel substrate by electron beam irradiation in vacuum condition. By optimizing the electron beam parameters, chromium carbide is in situ synthesized in the surface composite layer. The surface composite layer was analyzed with optical microscope, XRD analysis and trobological test. There are two main phases in the surface composite layer: chromium carbides as hard phase and austenite as tough phase. There are little typical hexagonal primary chromium carbides in the surface composite layer. Eutectic chromium carbides dispersively distribute between the interface of austenite phase to form a net like structure. It is metallurgical combination in the surface composite layer and the substrate. The existing of carbides in the composite layer provides a notable improvement on the wear resistant property of the surface layer.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第11期77-80,共4页
Transactions of The China Welding Institution
基金
上海市激光制造与材料改性重点实验室基金资助项目(08DZ2212)
关键词
表面复合层
真空电子束扫描
碳化铬
耐磨性
surface composite layer
vacuum electron beam irradiation
chromium carbide
wear resistance
