Wear Mechanism of WC-Co Cemented Carbide Tool in Cutting Ti-6Al-4V Based on Thermodynamics
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https: //doi. org/10.1007/s11595-020-2344-z
Wear Mechanism of WC-Co Cemented Carbide Tool in Cutting Ti-6Al-4V Based on Thermodynamics HU Xiaolong1,2, SHAO Fang1*, WANG Renwei3
(1.Guizhou Institute of Technology, Guiyang 550003, China; 2.School of Mechanical Engineering, Guizhou University, Guiyang 550025, China; 3.School of Mechanical Engineering, Shandong University, Jinan 250100, China)
Abstract: In order to optimize the tool coating material and reduce the tool wear rate, the coating material and wear mechanism for carbide tools are proposed and analyzed based on thermodynamics theory. We deduced the Gibbs free energy function method and analyzed the enthalpy value of the coating material of cemented carbide tools. The rules of diffusion wear and oxidation wear for WC-Co-based carbide tools were analyzed based on the diffusion dissolution theory and the calculation method of the thermal effect of chemical reaction. The diffusion wear and oxidation wear of WC-Co-based carbide tools when machining Ti-6Al-4V were studied with SEM-EDS. The results indicate that a good prediction accuracy of both diffusion wear and oxidation wear can be achieved by the method of thermodynamic theory analysis method. The conclusion will provide useful references for the optimization of cutting parameters and the improvement of the tool life. Key words: cemented carbide; thermodynamics; titanium alloy; wear mechanism
1 Introduction Titanium alloy has been widely used in the aerospace industry because of its excellent comprehensive mechanical properties, low density, good corrosion resistance, excellent high temperature tensile strength and creep strength[1-6]. However, titanium alloy is a kind of hard cutting material, which has poor machinability and high cutting temperature. Tungsten carbide (WCCo composite material) is the most commonly used tool in titanium alloy processing. With the increase of highspeed cutting speed, the contradiction between work hardening and thermal softening leads to tool wear[7]. On the other hand, the temperature ascended sharply when the tool flank wear appeared and in turn promoted the degradation of tool[8]. Furthermore, diffusion wear, oxidation wear and adhesive wear are the main wear
© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Apr. 1, 2019; Accepted: July 26, 2020) HU Xiaolong(胡小龙): E-mail: [email protected] *Corresponding author. SHAO Fang(邵芳): Prof.; Ph D; E-mail: [email protected]. Funded by the National Natural Science Foundation of China (No. 51465009), Natural Science Foundation of Guizhou Province(Guizhou Science and Technology Agency) (No. J[2014]2085)), Academician Workstation of Guizhou Institute of Technology(No.2014)4007)), Department of Education of Guizhou Province 125 Project(No.[2014]035)
mechanisms of cemented carbide. With the increase of temperature, diffusion will become the main wear mechanism, which will lead to the failure of cemented carbide tools[9]. However, the rapid wear of the cutting tool
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