Abstract
The purpose of this paper is to clarify the wear mechanism at high cutting speed where mutual diffusion at interface comes to active.The relation between the crater wear rate and the condition of diffusion layer by cutting test and dynamic diffusion test, for reference, was investigated and discussed. Combination of materials was cermet tool of TiC type to plain carbon steel of 0.45%C. In the cutting test by turning, cutting speed was varied from 2.5 m/s to 7.5 m/s. In the dynamic diffusion test, the contact planes of both samples inclined at 5 degrees under axial load, were kept at high temperature ranging from 1273 K to 1473 K for 30 minutes in argon gas environment. The surface of samples was observed and analyzed using SEM and EPMA. The main results obtained are as follows:(1) At a tool face temperature over 1300 K, the wear rate depends strongly upon the temperature.(2) In this circumstance, a Ti-rich layer on the worn surface of tool is observed, which is hard and a brittle layer of several um thick.(3) A model can be proposed in which the wear proceeds by the repetition of formation and tearing off of the layer.(4) The layer is produced as a result of diffusion at interface and squeeze of binding material of Ni by pressure.
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