Title of article :
Cemented carbide cutting tool: Laser processing and thermal stress analysis
Author/Authors :
B.S. Yilbas، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
9
From page :
5544
To page :
5552
Abstract :
Laser treatment of cemented carbide tool surface consisting of W, C, TiC, TaC is examined and thermal stress developed due to temperature gradients in the laser treated region is predicted numerically. Temperature rise in the substrate material is computed numerically using the Fourier heating model. Experiment is carried out to treat the tool surfaces using a CO2 laser while SEM, XRD and EDS are carried out for morphological and structural characterization of the treated surface. Laser parameters were selected include the laser output power, duty cycle, assisting gas pressure, scanning speed, and nominal focus setting of the focusing lens. It is found that temperature gradient attains significantly high values below the surface particularly for titanium and tantalum carbides, which in turn, results in high thermal stress generation in this region. SEM examination of laser treated surface and its cross section reveals that crack initiation below the surface occurs and crack extends over the depth of the laser treated region.
Keywords :
Cemented tool , Laser , thermal stress , model
Journal title :
Applied Surface Science
Serial Year :
2007
Journal title :
Applied Surface Science
Record number :
1003687
Link To Document :
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