Effect of Laser Pre-Treatment on the Machining Performance of Aluminum/SiC MMC

[+] Author and Article Information
Stuart Barnes, Richard Morgan, Andrew Skeen

Warwick Manufacturing Group, School of Engineering, University of Warwick, Coventry, England

J. Eng. Mater. Technol 125(4), 378-384 (Sep 22, 2003) (7 pages) doi:10.1115/1.1605112 History: Received January 10, 2003; Revised June 17, 2003; Online September 22, 2003
Copyright © 2003 by ASME
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Needle-like Al4C3 phase produced during Nd:YAG processing
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Microhardness profiles from samples laser processed at 1200 W
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First 1 mm of the microhardness profiles shown in Fig. 6
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Variation in hardening depth with processing speed
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Section of machined workpiece material showing machined groove going right to left
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Microstructure of the MMC workpiece material showing angular Silicon Carbide (SiC) particles in an aluminum alloy matrix
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General view of the 6 mm diameter cutting tool showing (a) the datum point, (b) the location of flank wear, and (c) regression wear measurements
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Experimental setup showing the laser positioned above the CNC controlled x−y table onto which the workpiece was located
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Microsection showing the HAZ after laser treatment and the location of the hardness profile
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Low magnification SEM image of a worn cutting tool with arrow indicating the wear land
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SEM image of the wear land on a worn cutting tool. Area A shows an abrasive wear land and area B adherent material.
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Variation of flank wear, cutting edge regression and normalized matrix hardness with laser pre-treatment parameters
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Feed force data for selected laser pre-treatments
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Damaged SiC particles on the machined surface
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Smeared material on the sidewall of the machined grooves (a) new and (b) worn tool
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Optical micrographs of the features shown in Fig. 14. The absence of subsurface damage and fractured SiC particles produced by the new tool can be seen in (a) and in contrast to the damage caused by a worn tool in (b).



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