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Effect of MoS2 Powder-Mixed Electric Discharge Alloying on the Tribological Performance of Ti6Al4V

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Abstract

In the present work, powder-mixed electrical discharge machining (PMEDM) experiments of Ti6Al4V alloy with molybdenum disulfide (MoS2) powders at three levels of concentrations and at three levels of pulse on time (Ton) have been performed. The maximum material removal rate observed was 0.006966 gm/min with the MoS2 powder at 2 gm/L powder concentration, 15 µs Ton, and the minimum tool wear rate (TWR) was 0.000147 gm/min at 3 gm/L and 15 µs Ton. Pin-on-disk experiments were carried out at 50 N load and 1 m/s sliding velocity. MoS2 powder specimens had shown more wear resistance and less coefficient of friction. The wear resistance of Ti6Al4V after PMEDM using MoS2 powder increased by 40.143% at 2 gm/L powder concentration and 40 µs Ton. The tribological performance was enhanced by using powders because these powders act as self-lubricant. Abrasive and delamination wear was the predominant wear mechanisms observed on the worn surface.

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Abbreviations

CoF:

Coefficient of friction

EDM:

Electrical discharge machining

EDX:

Energy-dispersive x-ray spectroscopy

LVDT:

Linear variable displacement transducer

MRR:

Material removal rate

PMEDM:

Powder-mixed electrical discharge machining

PMEDA:

Powder-mixed electrical discharge alloying

PoD:

Pin-on-disk

RL:

Recast layer

SEM:

Scanning electron microscopy

SR:

Surface roughness

SWR:

Specific wear rate

Ti64:

Ti6Al4v

TWR:

Tool wear rate

XRD:

X-ray diffraction spectroscopy

Al:

Aluminum

Al2O3 :

Aluminum oxide

C:

Carbon

Cr:

Chromium

EN31:

Case-hardened steel

Fe:

Iron

gm/L:

Gram per liter

gm/min:

Gram per minute

Mo:

Molybdenum

MoO2 :

Molybdenum dioxide

MoS2 :

Molybdenum disulfide

O:

Oxygen

S:

Sulfur

Sa:

Average surface roughness

Ti:

Titanium

TiO:

Titanium oxide

Ton:

Pulse on time

WO3 :

Tungsten trioxide

WS2 :

Tungsten dioxide

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Acknowledgements

Authors would like to sincerely thank Department of Science and Technology (DST), Govt. of India for carrying out this project under FIST (FIST–No. SR/FST/ETI-388/2015) scheme. Also, the authors thank the UGC DAE Consortium for Scientific Research for the partial financial support to complete this project under CRS/2021-22/04/636.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Advanced Manufacturing Centre, National Institute of Technology Calicut, Calicut, Kerala, 673601, India

    Renumala Sudheer, M. Venkata Krishna Reddy, Jino Joshy, Basil Kuriachen & M. L. Joy

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  1. Renumala Sudheer
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  3. Jino Joshy
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Correspondence to Basil Kuriachen.

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Sudheer, R., Reddy, M.V.K., Joshy, J. et al. Effect of MoS2 Powder-Mixed Electric Discharge Alloying on the Tribological Performance of Ti6Al4V. Trans Indian Inst Met 76, 2363–2375 (2023). https://doi.org/10.1007/s12666-022-02786-0

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