Abstract
Abstract The wear behaviour in the turning of AISI 4340 hardened alloy steels by CBN and ceramic tools was studied. Experimental results showed that the main wear mechanism for the CBN tools was the abrasion of the binder material by the hard carbide particles of the workpiece. For the ceramic tools, there was adhesive wear and abrasive wear. It was also found that there was a protective layer formed on the chip–tool interface. For the CBN tool, this was a solution of the binder of the tool material and the work material, while for the ceramic tool, this was from the work material. This layer plays a very important role in the wear behavior of CBN and ceramic tools. Variations of tool wear with the cutting speed and the hardness of the work material are discussed accordingly.
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