Covering with Carbon Black and Thermal Treatment by a CO2 Laser Surfaces of Aisi 4340 Steel

G. de Vasconcelos; D.C. Chagas; D.C. Campos; A.N. Dias

doi:10.4028/www.scientific.net/MSF.727-728.340

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HomeMaterials Science ForumMaterials Science Forum Vols. 727-728Covering with Carbon Black and Thermal Treatment...

Covering with Carbon Black and Thermal Treatment by a CO₂ Laser Surfaces of Aisi 4340 Steel

Abstract:

This work presents the evaluation of the use covering with carbon black to replace the graphite covering used in previous work, aiming to eliminate the grinding step to the process. The results of this treatment were characterized by optical microscopy, scanning electron and hardness. The micro hardness achieved was near to 760 HV _0.05, coefficient of friction of 0.2. Scanning electron microscopy showed that the extent of the treated area by laser reaches near to 90μm, and the thickness coating of carbon black is about to 2μm. The graphite can be substituted by carbon black, acting as coupling of the laser beam radiation, and as a solid lubricant, according to REIS (2009).

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Periodical:

Materials Science Forum (Volumes 727-728)

Pages:

340-344

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.727-728.340

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Online since:

August 2012

Authors:

G. de Vasconcelos, D.C. Chagas, D.C. Campos, A.N. Dias

Keywords:

Covering, Friction, Hardness, Laser, Thermal Treatment

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References

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