标题：Experimental investigations on the failure mechanism and self-sharpening of a graded tool
作者：Zheng, Guangming ;Cheng, Xiang ;Li, Li ;Zhao, Jun ;Zhao, Guoyong ;Tian, Yebing
作者机构：[Zheng, Guangming ;Cheng, Xiang ;Li, Li ;Zhao, Guoyong ;Tian, Yebing ] School of Mechanical Engineering, Shandong University of Technology, Zibo, Chin 更多
通讯作者地址：[Zheng, G] School of Mechanical Engineering, Shandong University of Technology, 266 West Xincun Road, China;
来源：Machining Science and Technology
关键词：cutting parameter; Failure mechanism; graded tool; Inconel 718; self-sharpening
摘要：To solve the urgent needs of high-performance cutting tool and high-efficient cutting process for nickel-based super alloy, a graded ceramic tool was manufactured and a series machining experiments were performed in high-speed (HS) conditions. The failure mechanisms of the graded tool were revealed by analysis the micro-structure and failure morphology. The experimental results exhibited that the primary failure mechanisms were adhesive wear, micro-chipping and flaking. For the graded tool, the step-shaped flaking surfaces and some narrow flaking strips were found on the rake face and along the cutting edge, respectively, which were the self-sharpening cutting characteristics. These characteristics should be attributed to the synergistic mechanisms of strengthening and toughening resulted from the reasonably graded structure. In addition, during the HS milling process, this characteristic was also presented on the failure faces of homogeneous tool with SiC whisker reinforced. Therefore, it is concluded that the characteristics were in a close relation to the cutting parameters and tool mechanical properties. © 2019, © 2019 Taylor & Francis Group, LLC.