电子束原位合成Fe-Cr-C合金组织及力学性能  

Microstructures and Mechanical Properties of Fe-Cr-C in Situ Synthesis by Electron Beam

作　　者：吴晓敏[1] 芦凤桂[1] 陆斌峰[1] 俞海良[1] 

机构地区：[1]上海交通大学上海市激光制造与材料改性重点实验室,上海200240

出　　处：《上海交通大学学报》2010年第4期463-467,共5页Journal of Shanghai Jiaotong University

摘　　要：应用真空电子束四线段旋转扫描方法,采用4种不同配比的Fe/Cr/C合金粉末,在低合金钢表面原位合成不同性质的表面复合层.通过对熔敷试样进行金相、扫描电镜、X射线衍射分析以及表面显微硬度测试,分析不同配比Fe/Cr/C合金粉末对表面复合层组织及力学性能的影响.结果表明:不同粉末配比所制备的表面复合层差异较大,复合层中碳化物含量随粉末中碳含量的增加而增加,硬度也随之增大;复合层呈现马氏体组织、亚共晶组织、共晶组织和过共晶组织4种不同的组织特征.为获得优良的Fe-Cr-C系耐磨材料提供了重要依据.＂Four line rotation scanning＂ vacuum electron beam was used in this test.Different natures of surface composite layers were in situ synthesized on the low-alloy steel,with four different ratio of Fe/Cr/C alloy powder.Each deposited sample was analyzed with optical microscope（OM）,scanning electron microscope（SEM）,X-ray diffraction（XRD） and surface micro-hardness testing to study the effect of powder composition on the surface composite layer＇s microstructure and mechanical property.The results show that the microstructures of surface composite layers prepared by different ratio Fe/Cr/C powder mixtures vary significantly.As the carbon content increases,the amounts of carbides will be formed higher,and the hardness also increases.The microstructures of the composite layers are martensite structure,hypoeutectic microstructure,eutectic structure and hypereutectic microstructure.It provides an important basis for the Fe-Cr-C material to have excellent wear-resisting property.

关 键 词：电子束扫描 表面复合层 微观组织 硬度 

分 类 号：TG456.3[金属学及工艺—焊接]