The intention on finding the alternative tool material to support the usage of Coated Cemented Carbide for increasing the productivity in turning of hardened steel is the rationality of this study. Study on the mechanical properties of hardmetals and the advantages of modern Cermet cutting tools lead to nominate this tool to be applied for turning of hardened steel. The Uncoated Cermet tool made of titanium carbonitride (TiCN) as core particles, (Ti, Nb, W) (C, N) for the second hard phase, and a W-rich Co binder and the PVD-Coated (TiCN/TiN) were assigned to turning of high strength low alloy AISI 4340 with hardness of 50 HRC. The results of study show that both Cermet tools can be recommended to support the work of Coated Cemented Carbide, in particular for finish turning of the hardened steel. The optimum cutting condition at cutting speed (v) of 120 m/min, feed (f) of 0.1 mm/rev, and depth of cut (a) of 0.2 mm gives the best result in term of productivity. The Uncoated Cermet is preferred when productivity (Q) is in the amount of material removal (Q 81.60 cm³ per cutting edge at Ra 1.773 μm), while the PVD-Coated Cermet is the choice when productivity is more on quality of surface finish (Ra 0.891 μm) but the amount of material removal (Q 43.20 cm³ per cutting edge) is still concerned. Among those Cermet cutting tools reviewed, both Cermet cutting tools in this study are superior and worthy.

寻求替代工具材料以支持使用涂层硬质合金以提高淬火钢车削生产率的意图是本研究的合理性。对硬质合金的机械性能的研究以及现代金属陶瓷切削刀具的优势使得该工具被推荐用于淬硬钢的车削。Uncoated Cermet工具由碳氮化钛（TiCN）作为核心粒子，（Ti，Nb，W）（C，N）作为第二硬相，富W的Co粘结剂和PVD涂层（TiCN / TiN）制成被指定用于车削硬度为50 HRC的高强度低合金AISI 4340。研究结果表明，可以推荐使用两种金属陶瓷工具来支持涂层硬质合金的工作，特别是用于淬硬钢的精加工。切削速度下的最佳切削条件v）为120 m / min，进给量（f）为0.1 mm / rev，切深（a）为0.2 mm，就生产率而言，效果最佳。当生产率（Q）等于材料去除量时（在Ra 1.773μm处每个切削刃Q 81.60 cm ³），则首选无涂层金属陶瓷，而当生产率更多地取决于表面光洁度质量时，则选择PVD涂层金属陶瓷（ Ra 0.891μm），但仍要考虑材料去除量（每个切削刃Q 43.20 cm ³）。在审查的那些金属陶瓷切削刀具中，本研究中的两种金属陶瓷切削刀具都是优越且值得的。