Nanohardness and wear behaviour of AISI 1040 steel coated with Ti-6Al-4V 4B4C by magnetron sputtering

Russel, Malkiya Rasalin Prince; Natarajan, Selvakumar

Abstract

The Ti-6Al-4V-4B4C composite coatings have been deposited on AISI 1040 steel substrates by magnetron sputtering.The composition, structure, and topography of the coated surface have been explained by SEM, XRD, FT-IR and AFM. Theconstant coating thicknesses of 80 nm and 115 nm obtained for 0.5 h and 1h coating time, respectively. Wear tests have beenconducted on the coated AISI 1040 steel substrates by using ball-on-disc apparatus under 2N and 3N loads at roomtemperature. The Ti-6Al-4V-4B4C coating has shown an excellent wear rate with a lower coefficient of friction. The nanohardnessand elastic modulus of the AISI 1040 steel coated with Ti-6Al-4V-4B4C has been attained by the AFM nanoindentation technique that showed the maximum value of 10.7 GPa and 206.4 GPa, respectively. Ti-6Al-4V-4B4Ccomposite coatings have displayed to lowest wear rates among all loading conditions, hence signifying that it could be apromising alternative to other hard coatings.

Keyword(s)

Sputtering, Nanoindentation, Ball on discwear, Ti-6Al-4V-4B4C

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