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TITLE : Surface Roughness and Micro hardness studies of dry machined Ti–6% Al–4% V with PVD-coated and uncoated carbide insert  
ABSTRACT :

Titanium and its alloys are attractive materials due to their unique high strength–weight ratio that is maintained at elevated temperatures and their exceptional corrosion resistance. In machining titanium alloys, generally, the cutting tools wear off very rapidly because of the high cutting temperature resulted from the low thermal conductivity and density of the work material. The surface of titanium alloy is easily damaged during machining operations due to their poor machinability. This paper gives the investigation on surface integrity of machining titanium alloy Ti–6% Al–4% V with coated carbide cutting tool. The experiments were carried out under dry cutting conditions and compared with uncoated carbide cutting tool. The cutting speeds selected in the experiment were 90, 100, 105 and 115 m min −1. The depth of cuts was 1.8, 2.0 and 2.2 mm. The feed rates used in the experiment were 0.135, 0.1475, 0.1725, 0.185 mm /tooth. For a range of cutting speeds, feeds, and depths of cut, measurements of surface roughness of machined surface, micro hardness were taken and studied. Microstructure alterations were studied for all the range of parameters with coated and uncoated carbide cutting tools. 

Keywords – Carbide, PVD-coated, Surface Roughness, Micro hardness, Dry machining 
 
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