Performance Effects of Laser Deposited Ti-Al-Sn Coating on ASTM A29 Steel
O.S. Fatoba, S.A. Akinlabi, E.T. Akinlabidownload PDF
The conventional surface modification and coating cannot always fulfil the performance of material surface under extreme corrosion and wear environments. Corrosion and wear phenomenon lead to the gradual deterioration of components in industrial plants that can result in loss of plant efficiency, and even total shutdown with aggravated damage in industries. Hence, surface modification by incorporating chemical barrier coatings can be beneficial to this extent we report on investigation aimed at enhancing the surface properties of ASTM A29 steel by incorporating Ti-Al-Sn coatings deposited by laser deposition technique. For this purpose, a 3-kW continuous wave ytterbium laser system attached to a KUKA robot which controls the movement during the alloying process was utilized to deposit coatings with stoichiometry Ti-30Al-20Sn and Ti-20Al-20Sn. The alloyed surfaces were investigated in terms of its hardness and wear behaviour as function of the laser processing conditions. Hardness measurements were done using a vickers micro-hardness tester model FM700. Wear tests were performed on prepared ASTM A29 steel substrate deposited sample using the reciprocating tribometer (CERT UMT-2) under dry reciprocating conditions with continual recording of the dynamic coefficient of friction (COF) values. The microstructures of the coated and uncoated samples were characterized by optical and scanning electron microscopy. In addition, X-ray diffraction was used to identify the phase’s contents. The optimum performances were obtained for an alloy composition of Ti-20Al-20Sn, at laser power of 750 W and coating speed of 0.8 m/min. Its performance enhancement compared to the unprotected substrate comprised a significant increase in hardness from 115 to 509 HV and reduced wear volume loss from 0.717 to 0.053 mm3. The enhanced performance is attributed to the formation of the intermetallic phases Ti6Sn5, AlSn2Ti5, Ti3Al, and TiAl.
ASTM A29 Steel, Hardness, Wear, Ti-Al-Sn Coating, Intermetallics
Published online 4/20/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: O.S. Fatoba, S.A. Akinlabi, E.T. Akinlabi, ‘Performance Effects of Laser Deposited Ti-Al-Sn Coating on ASTM A29 Steel’, Materials Research Proceedings, Vol. 4, pp 135-140, 2018
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