Damage of physical vapor deposition coatings of cutting tools during alloy 718 turning
Damage of physical vapor deposition coatings of cutting tools during alloy 718 turning
复制标题
DOI：
10.1016/j.precisioneng.2015.09.012
复制
发表时间：
2016-04
影响因子：
3.6
通讯作者：
S. Koseki;K. Inoue;H. Usuki
中科院分区：
文献类型：
--
作者：
S. Koseki;K. Inoue;H. Usuki
镍基超合金是典型的难切削材料。因此，用于切割这些材料的切割工具的寿命比用于其他材料的工具的寿命短。这项研究开发了一种新的涂层切削工具，具有所需的镍基高温合金车削性能。本研究根据涂层的损伤和涂层所需性能的测定，研究了电弧离子镀TiN涂层刀具的切削性能。为了评估刀具损伤，在损伤累积的每一步都采用了多种分析方法。通过扫描离子显微镜和透射电子显微镜（TEM）观察涂层在前刀面和后刀面边缘处的塑性变形。此外，涂层在表面缺陷附近的断裂（例如，液滴、空隙）是由于工件材料和表面缺陷之间的相互作用。此外，使用电子探针显微分析，扫描俄歇显微镜，和TEM，工作材料被确认为物理或机械，而不是化学粘附到切削刃。这意味着在切割后在粘合剂材料和涂层之间的界面中不发生氧化和扩散。最后，不同类型的涂层的有效性，不同的成分和沉积方法，通过评估减少损伤的效果进行了验证。使用在高温下具有更高稳定性和更少缺陷的涂层可以减少涂层切削刀具的损坏，增加刀具寿命。
Ni-based superalloys are typically difficult-to-cut materials. Therefore, the lifespan of cutting tools used to cut these materials is shorter than that of tools used on other materials. This study develops a new coating for cutting tools that has properties required for the turning of Ni-based superalloys. This study examined the cutting performance of TiN-coated cutting tools deposited by arc ion plating according to the damage of the coating and determination of the required properties of the coatings. To evaluate cutting tool damage, many analysis methods were used at each step of damage accumulation. Plastic deformation of the coating was observed at rake and flank face edges by scanning ion microscopy and transmission electron microscopy (TEM). Furthermore, the fracture of the coating near the surface defects (e.g., droplets, voids) was due to the interaction between the work material and surface defects. Moreover, using electron probe microanalysis, scanning auger microscopy, and TEM, the work material was confirmed to adhere to the cutting edge physically or mechanically, not chemically. This means that oxidation and diffusion did not occur in the interface between the adhesive material and coating after cutting. Finally, the effectiveness of different coating types, varying in both composition and deposition method, was verified by evaluating the effect of damage reduction. Using coatings with greater stability at high temperatures and fewer defects can reduce damage of the coated cutting tools, increasing tool lifespan.