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Research Papers: Friction and Wear

Dry Sliding Wear Behavior of Ti-6Al-4V Pin Against SS316L Disk at Constant Contact Pressure

[+] Author and Article Information
Ashok Raj J.

Centre for Product Design and Manufacturing,
Indian Institute of Science,
Bangalore 560012, India
e-mail: ashokche@gmail.com

Anirudhan Pottirayil

Department of Mechanical Engineering,
Government Engineering College,
Kozhikode 673005, India
e-mail: anirudhanp@gmail.com

Satish V. Kailas

Professor
Department of Mechanical Engineering,
Indian Institute of Science,
Bangalore 560012, India
e-mail: satvk@mecheng.iisc.ernet.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 22, 2015; final manuscript received March 26, 2016; published online August 11, 2016. Assoc. Editor: Sinan Muftu.

J. Tribol 139(2), 021603 (Aug 11, 2016) (9 pages) Paper No: TRIB-15-1341; doi: 10.1115/1.4033363 History: Received September 22, 2015; Revised March 26, 2016

Ti-6Al-4V pins were slid against SS316L disks in pin-on-disk arrangement using pins of different diameters; with the contact pressure maintained the same for all experiments under ambient and vacuum conditions. Characterization of the tribological samples was performed using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), and X-ray diffraction (XRD). The tribological behavior was found to be governed by strain rate response (SRR), tribo-oxidation (TO), formation of a mechanically mixed layer (MML), and frictional heating which can affect each of the above factors. For a particular set of experiments (ambient/vacuum), variation of wear-rate with respect to sliding speed were found to follow the heat flux in each set. Propensity of this material to undergo softening due to frictional heating and strain rate effects is reflected in the tribological response.

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References

Figures

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Fig. 6

(a) SEM image of pin sample showing oxide (4.6 mm φ, 0.5 ms−1, 68.7 N, ambient conditions) and (b) SEM image of pin sample without oxide (4.6 mm φ, 0.5 ms−1, 68.7 N, vacuum conditions)

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Fig. 7

(a) XRD spectrum of pin sample showing oxide (4.6 mm φ, 0.5 ms−1, 68.7 N, ambient conditions) and (b) XRD spectrum of pin sample showing oxide (4.6 mm φ, 0.5 ms−1, 68.7 N, ambient conditions)

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Fig. 8

SEM image of cross section of pin with MML and EDAX of MML (6.6 mm φ, 0.5 ms−1, 137.3 N, ambient conditions)

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Fig. 9

SEM image of cross section of pin having less amount of MML formation (2.1 mm φ, 0.5 ms−1, 13.7 N, ambient conditions)

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Fig. 10

Wear rate plotted as a function of pin diameter at each sliding velocity (ambient conditions)

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Fig. 11

Wear rate plotted as a function of pin diameter at each sliding velocity (vacuum conditions)

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Fig. 13

Heat flux plotted as a function of pin diameter; at each sliding velocity (vacuum conditions)

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Fig. 1

Variation in wear rate with sliding speed under ambient conditions

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Fig. 2

SEM images of debris from experiments in ambient indicating transition from mild to severe wear

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Fig. 3

Variation in wear rate with speed under vacuum conditions

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Fig. 4

Variation in coefficient of friction with speed under ambient conditions

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Fig. 5

Variation in coefficient of friction with speed under vacuum conditions

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Fig. 12

Heat flux plotted as a function of pin diameter at each sliding velocity (ambient conditions)

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Fig. 14

Wear rate plotted as a function of heat flux (ambient condition)

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Fig. 15

Wear rate plotted as a function of heat flux (vacuum condition)

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Fig. 16

(a) SEM micro-image of worn surface at a speed of 0.5 ms−1 and at the load of 137.3 N under vacuum conditions, (b) cross section of worn surface, shows the three different zones, and (c) EDAX result at square marked region at cross section of the pin

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