INFLUENCE OF MICROSTRUCTURE ON WEAR RESISTANCE PARAMETER OF CERAMIC CUTTING TOOLS |
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| Authors: | A K Dutta N Narasaiah A B Chattopadhyay K K Ray |
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| Affiliation: |
a Department of Mechanical Engineering, Bengal Engineering College (Deemed University), Howrah, India
b Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, India
c Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India |
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| Abstract: | This report examines the role of microstructure of a new type of cutting tool material on an existing relationship between its abrasion wear resistance, fracture toughness (KIC), and hardness (H). Three alumina-silver composites with different amounts of metal particles have been prepared, and their hardness and fracture toughness properties have been determined together with the assessment of their microstructural features such as volume fraction of the second phase, porosity, etc. The mechanical wear on the flanks of cutting tool inserts, made from the developed composites, has also been estimated by machining experiments against 0.45% carbon steel. The results indicate that flank wear resistance of these silver toughened ceramic cutting tool inserts is not proportional to an existing wear resistance parameter KIC3/4H1/2. A modified relation between flank wear resistance, hardness, and fracture toughness has been suggested here for these cutting tool materials. The modification incorporates consideration of the volume fraction of the second phase and the porosity in the developed metal toughened ceramics. |
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| Keywords: | Wear Flank wear Wear parameter Hardness True hardness Fracture toughness Indentation fracture toughness Ceramic cutting tool Cutting tool inserts Alumina composite Advanced ceramics Alumina silver composite Metal toughening Machining Dry turning |
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