Investigation of Cutting Temperature during Turning Inconel 718 with (Ti,Al)N PVD Coated Cemented Carbide Tools

Jinfu Zhao; Zhanqiang Liu; Qi Shen; Bing Wang; Qingqing Wang

doi:10.3390/ma11081281

Investigation of Cutting Temperature during Turning Inconel 718 with (Ti,Al)N PVD Coated Cemented Carbide Tools

Materials (Basel). 2018 Jul 25;11(8):1281. doi: 10.3390/ma11081281.

Authors

Jinfu Zhao^{1

2}, Zhanqiang Liu^{3

4}, Qi Shen^{5

6}, Bing Wang^{7

8}, Qingqing Wang^{9

10}

Affiliations

¹ School of Mechanical Engineering, Shandong University, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, Jinan 250061, China. sduzhaojinfu@gmail.com.
² Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, China. sduzhaojinfu@gmail.com.
³ School of Mechanical Engineering, Shandong University, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, Jinan 250061, China. melius@sdu.edu.cn.
⁴ Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, China. melius@sdu.edu.cn.
⁵ School of Mechanical Engineering, Shandong University, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, Jinan 250061, China. sdushenqi@gmail.com.
⁶ Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, China. sdushenqi@gmail.com.
⁷ School of Mechanical Engineering, Shandong University, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, Jinan 250061, China. sduwangbing@gmail.com.
⁸ Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, China. sduwangbing@gmail.com.
⁹ School of Mechanical Engineering, Shandong University, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, Jinan 250061, China. sduwangqingqing@gmail.com.
¹⁰ Key National Demonstration Center for Experimental Mechanical Engineering Education, Jinan 250061, China. sduwangqingqing@gmail.com.

Abstract

Physical Vapor Deposition (PVD) Ti_1-xAl_xN coated cemented carbide tools are commonly used to cut difficult-to-machine super alloy of Inconel 718. The Al concentration x of Ti_1-xAl_xN coating can affect the coating microstructure, mechanical and thermo-physical properties of Ti_1-xAl_xN coating, which affects the cutting temperature in the machining process. Cutting temperature has great influence on the tool life and the machined surface quality. In this study, the influences of PVD (Ti,Al)N coated cemented carbide tools on the cutting temperature were analyzed. Firstly, the microstructures of PVD Ti_0.41Al_0.59N and Ti_0.55Al_0.45N coatings were inspected. The increase of Al concentration x enhanced the crystallinity of PVD Ti_1-xAl_xN coatings without epitaxy growth of TiAlN crystals. Secondly, the mechanical and thermo-physical properties of PVD Ti_0.41Al_0.59N and Ti_0.55Al_0.45N coated tools were analyzed. The pinning effects of coating increased with the increasing of Al concentration x, which can decrease the friction coefficient between the PVD Ti_1-xAl_xN coated cemented carbide tools and the Inconel 718 material. The coating hardness and thermal conductivity of Ti_1-xAl_xN coatings increased with the increase of Al concentration x. Thirdly, the influences of PVD Ti_1-xAl_xN coated tools on the cutting temperature in turning Inconel 718 were analyzed by mathematical analysis modelling and Lagrange simulation methods. Compared with the uncoated tools, PVD Ti_0.41Al_0.59N coated tools decreased the heat generation as well as the tool temperature to reduce the thermal stress generated within the tools. Lastly, the influences of Ti_1-xAl_xN coatings on surface morphologies of the tool rake faces were analyzed. The conclusions can reveal the influences of PVD Ti_1-xAl_xN coatings on cutting temperature, which can provide guidance in the proper choice of Al concentration x for PVD Ti_1-xAl_xN coated tools in turning Inconel 718.

Keywords: Inconel 718; PVD Ti0.41Al0.59N/Ti0.55Al0.45N coating; cutting temperature.