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Tool wear mechanisms in machining of three titanium alloys with increasing beta-phase fraction

DSpace at IIT Bombay

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Title Tool wear mechanisms in machining of three titanium alloys with increasing beta-phase fraction
 
Creator JOSHI, S
PAWAR, P
TEWARI, A
JOSHI, SS
 
Subject Tool wear
chip-tool contact length
wear mechanism
diffusion
coating delamination
titanium
beta-phase fraction
TI-6AL-4V ALLOY
CBN TOOLS
PERFORMANCE
 
Description Mechanical and microstructural properties of titanium alloys change with beta-phase fraction. This in turn influences the dominant tool wear mechanisms in their machining. This work therefore involves turning experimentation on three titanium alloys with varying beta-phase fraction, namely, alpha, alpha + beta and beta-rich alloys using coated carbide tools, to identify dominant wear mechanisms, which hitherto have not been adequately investigated. The dominant wear mechanisms were investigated using scanning electron microscopy and energy-dispersive X-ray analysis of worn tool surfaces and were also correlated with the cutting forces during machining. Abrasion, abrasion with built-up edge and plastic deformation of cutting edge appeared to be the dominant tool wear mechanisms in alpha, alpha+ beta and beta-rich alloy, respectively. At the same time, diffusion of Sn, V and Mo from alpha, alpha+ beta and beta-rich alloys to tool face, respectively, was observed. The chip-tool contact length predicted using the analytical models from the literature matched closely with the experimental values.
 
Publisher SAGE PUBLICATIONS LTD
 
Date 2014-12-29T04:44:27Z
2014-12-29T04:44:27Z
2014
 
Type Article
 
Identifier PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE, 228(9)1090-1103
0954-4054
2041-2975
http://dx.doi.org/10.1177/0954405414522796
http://dspace.library.iitb.ac.in/jspui/handle/100/17108
 
Language English