摘要
电子束表面合金化处理可以提高材料的表面硬度、改善其性能。研究电子束扫描合金化处理对45钢表面层组织的影响；探讨添加不同粉末电子束扫描合金化处理对45钢表面硬度的影响；探讨添加不同粉末电子束扫描合金化处理对45钢表面耐磨性能的影响。采用扫描电镜分析强化层的显微组织，用显微硬度计进行硬度测试，用磨损试验机测试其耐磨性能。结果表明，45钢经电子束扫描合金化处理后，组织可以分为合金化层、热影响区和基体三个部分，其中合金化层又包括熔化区和稀释区。熔化区的组织呈多边形块状，为过饱和奥氏体树枝晶组织，晶界上有网状碳化物；在稀释区形成了多种强化相。试样表面的硬度大大提高，试样表面的耐磨性能提高近10～12倍。
The surface hardness and properties of materials were both improved by means of electron beam surface alloying processing. It was studied in this work that the influence of electron-beam scanning alloying processing on the surface layer organization of 45stell and the influence of electron-beam scanning alloying processing on the surface hardness of 45 steel by adding different powers. The influence of electron-beam scanning alloying processing by adding different powers on the surface wear-resisting performance of 45 steel also was stud-ied in this work. The microstructure of strengthening layer was analyzed by using scanning electron microscopy. The hardness was tested by using micro hardness tester and the wear-resisting performance was tested by using wear testing machine. The experimental results showed that the microstructure of 45 steel can be divided into three zones：the alloying layer;the heat affect zone;the substrate after electron beam surface alloying processing. The melting zone and the dilute zone are included in alloying layer. The microstructure of fusion zone is poly-gon block. It is supersaturated austenitic dendrites microstructure and there is network carbide in the grain boundary. Varieties of strengthen-ing phase were formed in the dilution zone. The hardness of the sample surface was greatly increased and the wear-resisting performance of the sample surface was increased nearly 10 to 12 times.
出处
《液压气动与密封》
2015年第5期29-32,共4页
Hydraulics Pneumatics & Seals
关键词
45钢
电子束扫描
合金化
金相组织
硬度
45 steel
electron beam scanning
alloying
microstructure
hardness
