Abstract
The principal aim of this paper is to identify the wear mechanisms of CBN and mixed-ceramic tools during finish hard turning of low to medium hardness (42–52 HRC) AISI H11 steel under different machining conditions. The effect of machining parameters viz. cutting speed, feed rate, depth of cut and work hardness on wear pattern of these tools have been investigated. The prominent wear modes observed for CBN tool are abrasion wear, formation of transferred layer resulting from tribochemical reactions between constituents of tool, and workpiece material, built up edge, adhesion of workpiece material followed by plastic deformation and notching clearly visible at low workpiece hardness (47 HRC). The different wear mechanisms observed for mixed ceramic tool are abrasion wear, notch wear, chipping and brittle fractures of tool surface due to rubbing and impingement of hard particles in the work material, built up edge and adhesion followed by plastic deformation. The tool wear was characterised through optical microscopy and scanning electron microscope accompanied with energy dispersive analysis through X-ray.
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