Cutting performance and wear mechanisms of Sialon ceramic cutting tools at high speed dry turning of gray cast iron |
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| Affiliation: | 1. Anadolu University, Department of Materials Science and Engineering, Iki Eylul Campus, 26480 Eskisehir, Turkey;2. Koç University, Manufacturing and Automation Research Center, Department of Mechanical Engineering, Sariyer, 34450 Istanbul, Turkey;1. School of Materials Science and Technology, Beijing Key Laboratory of Material Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences (Beijing), Beijing 100083, China;2. Key Laboratory on Deep Geodrilling Technology of the Ministry of Land and Resources, China University of Geosciences (Beijing), Beijing 100083, China |
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| Abstract: | In the present work, the phase composition and microstructure of two Sialon cutting inserts (named sample A and sample B) were characterized by XRD and SEM. The cutting performance and wear mechanism of the cutting inserts were investigated at high-speed dry turning of gray cast iron. The results showed that the main phases of them were α- and β-Sialon, and the sample A contained more α-Sialon than that of sample B. The grains of the Sialon cutting inserts are mainly elongated shape, and the aspect ratios are about 5.32 and 5.09, respectively. The tool life of sample B was longer than that of sample A at low speed. However, with the speeds increased, the tool life of sample A was getting closer to that of sample B and then exceeded that of sample B. The wear mechanisms of the two cutting inserts were abrasive and adhesive wear, however, as the cutting speeds increased, the dominant wear mechanisms were different. |
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