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Laser Assisted Nitriding of Ti‐6Al‐4V Alloy: Metallurgical and Electrochemical Properties
Author(s) -
Yilbas B. S.,
Khalid M.,
Shuja S. Z.
Publication year - 1999
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/(sici)1521-4125(199910)22:10<871::aid-ceat871>3.0.co;2-0
Subject(s) - nitriding , materials science , alloy , nitride , metallurgy , tin , laser , surface engineering , layer (electronics) , titanium alloy , surface modification , electrochemistry , composite material , electrode , chemical engineering , optics , physics , chemistry , engineering
The surface properties of Ti‐6Al‐4V alloy, such as wear resistance, are inadequate for many applications. To improve the surface properties of the alloy, many techniques have been considered. One of the promising techniques is to form a nitride layer on the surface of the workpiece by a laser beam. In the present study, laser assisted nitriding of the Ti‐6Al‐4V alloy surface is carried out under a nitrogen gas flow environment. A CO 2 laser is used to irradiate the Ti‐6Al‐4V alloy surface while nitrogen is introduced co‐axially with the laser beam onto the workpiece surface. The resulting surface cross section is examined metallurgically. SEM and XRD were carried out for material characterization. The study is extended to include the electrochemical response of the resulting surfaces. The surface morphology of the electrochemically treated workpieces are examined. It is found that in the laser treated region dendritic structures occur and TiN forms in the surface vicinity. The density of pit formation at the surface of the treated region reduces considerably.