Abstract
In this paper, the machining performance and wear mechanisms of two alumina-based ceramic cutting tools (Al 2O 3/TiB 2 and Al 2O 3/TiB 2/SiC w) in continuous turning of hardened steel and nickel based alloy (Inconel 718) were examined. Results showed that in turning of hardened steel performed under identical conditions, Al 2O 3/TiB 2/SiC w tool exhibited lower flank wear resistance than that of Al 2O 3/TiB 2 tool, the mechanisms responsible for this were determined to be the strong atom bonding between SiC and Fe, and the whisker pullout from the matrix for Al 2O 3/TiB 2/SiC w ceramic tool. In continuous turning of Inconel 718, the Al 2O 3/TiB 2/SiC w tool showed greatly improved flank wear resistance compared to Al 2O 3/TiB 2 tool, adhesion and abrasion wear were found to be the dominant wear mechanisms, the adhesion and diffusion of Ni, and Cr of Inconel 718 to the tool rake face may accelerate the tool wear rates.
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