强流脉冲电子束表面处理对TiAlN涂层刀具的组织结构及性能的影响

Influences of High Current Pulsed Electron Beam Treatment on Microstructure and Performance of TiAlN Coated Cutting Tools

采用强流脉冲电子束表面改性技术对TiAlN涂层刀具表面进行轰击处理。利用扫描电镜、X射线衍射仪研究轰击次数对TiAlN涂层刀具表面形貌、涂层厚度及物相组成的影响,检测TiAlN涂层的显微硬度和粗糙度,并对轰击前后涂层刀具的切削性能进行分析。结果表明:随着轰击次数的增加,涂层的厚度减小,涂层表面在微区范围内更致密、光滑,显微硬度则先小幅提高后急剧下降,而涂层的物相组成基本保持不变。与原始刀具的切削性能相比,轰击后的涂层刀具切削速率小幅提高,而刀具后刀面磨损有所下降。

TiA1N coated cutting tools were irradiated by high current pulsed electron beam （HCPEB）. The effects of pulsed numbers on the morphology, the thickness of coatings, and its phase composi- tion were investigated with SEM, XRD method. Meanwhile, micro-hardness and roughness of cutting tools were measured. The cutting performances of untreated tools and treated tools were obtained through turning test. The results show that with the increasing pulse numbers, the thickness of coat- ings decreases, the surface manifests the characteristic of dense and smooth coatings in the micro re- gions, and its microhardness first increases and then decreases sharply. However, surface phase com- position has no changed obviously. The cutting speed of treated tools increases, and the flank wear decreases compared with untreated one.