Effect of Powder-Mixed Electric Discharge Alloying Using WS2 on the Tribological Performance of Ti6Al4V

Powder-mixed electric discharge machining (PMEDM) of Ti6Al4V is performed in the current study using tungsten disulphide (WS 2 ) powder as the additive in dielectric media. PMEDM at different levels of pulse on time ( T on ) at three levels of powder concentrations was conducted, and it was observed...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2023-09, Vol.76 (9), p.2413-2424
Main Authors: Joshy, Jino, Venkata Krishna Reddy, M., Kuriachen, Basil, Joy, M. L.
Format: Article
Language:English
Subjects:
Abrasive wear
Alloy powders
Aluminum oxide
Chemistry and Materials Science
Coefficient of friction
Corrosion and Coatings
Electric discharge machining
Frictional wear
Lubricating properties
Materials Science
Metallic Materials
Original Article
Sliding friction
Surface roughness
Titanium base alloys
Tribology
Tungsten disulfide
Wear mechanisms
Wear rate
Wear tests
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Summary:Powder-mixed electric discharge machining (PMEDM) of Ti6Al4V is performed in the current study using tungsten disulphide (WS 2 ) powder as the additive in dielectric media. PMEDM at different levels of pulse on time ( T on ) at three levels of powder concentrations was conducted, and it was observed that MRR improved with the PMEDM process. The surface roughness analysis of the PMEDM samples showed that there was not any direct relation with T on time; however, with an increase in powder concentration, TWR was reduced. The PMEDM-prepared specimens were further used to analyse the tribological performance of surface-modified Ti6Al4V using pin-on-disc experimentation. PMEDM samples exhibited improved tribological performance in terms of coefficient of friction and specific wear rate (SWR). The lowest SWR was 2.8623E−05 at 2 gm/L, 40 µs T on . During the dry condition sliding wear test, oxides of Ti (TiO) and Al (Al 2 O 3 ) were formed due to the frictional heating, creating a protective tribofilm that helped to reduce wear. WS 2 and its oxides were also identified during XRD analysis of the worn surface, which had lubricating properties bringing down the friction at the interface for the PMEDM samples. Abrasive and delamination wear were the predominant wear mechanisms identified on the worn surface.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-022-02817-w