Characterization of cyclic plasticity type wear mechanism for titanium alloy, TI-6AL-4V on reciprocating sliding wear test
This study presents the characterization of cyclic plasticity type wear mechanism on reciprocating sliding wear test for Titanium alloy, Ti-6Al-4V. The reciprocating sliding wear test set up by pin-on-flat configuration made from Ti-6Al-4V. Dimension of flat bar used Contact material is 100 x...
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Format: | Thesis |
Language: | English English English |
Published: |
2020
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Online Access: | http://eprints.uthm.edu.my/1007/3/24p%20AINI%20SYAFIQAH%20MOHD%20NASIR.pdf http://eprints.uthm.edu.my/1007/1/AINI%20SYAFIQAH%20MOHD%20NASIR%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1007/2/AINI%20SYAFIQAH%20MOHD%20NASIR%20WATERMARK.pdf |
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Summary: | This study presents the characterization of cyclic plasticity type wear mechanism on
reciprocating sliding wear test for Titanium alloy, Ti-6Al-4V. The reciprocating sliding wear
test set up by pin-on-flat configuration made from Ti-6Al-4V. Dimension of flat bar used
Contact material is 100 x 25 x 8 mm. Meanwhile for the contact pin, two different diameter
cylinders are used i.e Ø6.5 mm and Ø12 mm. The effects of variable parameter set up which
are applied normal load (50–200 N), number of cycles (5–20 cycles), and frequency (1– 2.5
Hz) on reciprocating sliding wear behavior are investigated. Frictional force resulted 60 –
80 N tangential force in range for those three parameter setup by both two contact pins
cylinder. The COF resulted running-in condition at the earlier second and highest peak
experienced in value range of 0.45-0.48. The COF graph pattern shows increasing at 1
second and the decreasing continuously. For the micrography, it shows sticking mostly at
the end of wear track and significant at 200 N, 20 cycles and 1 Hz frequency for those two
contact pins cylinder. The profilometry shows the result of wear width and wear area where
the wear width and wear area increasing with the increasing of number of cycles, applied
normal load and sliding frequency for both contact pins cylinder. The hardness shows high
value at 200 N, 20 cycle and 2.5 Hz of frequency. Contact pin Ø6.5 mm experienced greater
wear width, wear area and hardness due to high contact pressure applied during the sliding.
The cyclic plasticity presences following reciprocating sliding wear test of Ti-6Al-4V are
examined using SEM. The black spot presence at the end of wear track are identified as an
accumulation of ploughing that occurred during the sliding and proved by the highest
hardness value recorded, 962 HV for contact pin Ø6.5 mm that determined by using Micro
Vickers Hardness Tester. This is strong evidence that shows that plastic deformation is form
during the sliding wear. The existing of element O by EDX analysis also proved the
formation of plastic deformation. The optimum parameters to achieved high plasticity type
wear behaviour also are determined. High frequency experienced low number of COF and
marginal plastic deformation form during the reciprocating sliding wear test while low cycle
and low applied normal load will caused low formation of cyclic plastic deformation. |
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