Abstract:The unidirectional rotary and reciprocating sliding experiments of the 40Cr pin/GCr15 disc tribo-pair were carried out on the MFT-5000 Rtec friction and wear tester under the same test conditions with a sliding speed of 0.2 m/s and a load of 150 N. Compared with reciprocating sliding, the tribo-pair in rotary sliding exhibits a stabler friction coefficient and better wear resistance. By analyzing the wear surface morphologies of the two pins, the main wear mechanism was found to be adhesive wear. For the tribo… Show more
“…As the interfacial medium, the debris (developed during interactive sliding) may cause a larger friction coefficient (CoF) and significant fluctuations under reciprocating sliding [12]. Therefore, in comparison, the tribo-pair in rotary sliding exhibits a stabler friction coefficient (CoF) and better wear resistance and is presumably good for laboratory scale testing [13]. In addition, the stroke of reciprocating sliding is shorter than that of rotary sliding, and the heat dissipation is slower, which intensified the formation and propagation of surface microcracks and the detachment of debris from the matrix which leads to the lot of fluctuation in friction and wear data [14].…”
Section: Methodsmentioning
confidence: 99%
“…Under unidirectional rotary sliding, the severely deformed vortex structure with high microhardness and brittleness was formed in the tribo-layer. The reason for the difficulty in forming the vortex structure in reciprocating sliding may have been the relatively high stacking fault energy and insufficient strain rate [13]. Figure 2 Tribo-testing of Ti6Al4V specimens at Insitu experimental conditions (front and side views).…”
In this work, the dry sliding wear characteristics of Ti6Al4V (Ti64) -EN31 (steel) tribo-pair at incremental sliding velocity (SV, 0.838-1.466 ms -1 ) and load (L, 50-100 N) conditions are elucidated. As evident, specific wear rate (SWR) and coefficient of friction (CoF) increases and decreases, respectively with load and SV. The wear response of Ti64 undergoes a transition from composite type (oxidative and metallic) to delamination. The evolved oxides, viz. TiO and Ti 8 O 15 were majorly in the form of free particulates. At low SV (0.838-1.047 ms -1 ) and low load (50-70 N), the movable particulates can activate a separation effect limiting the damage due to wear. During severe sliding (SV = 1.257-1.466 ms -1 and L = 70-100 N), the combined influence of frictional heating instigated thermal softening, and the formation/retainment of hard-coarse particulates at the interaction zone causes perforation into the substratum, assisting in spalling.
“…As the interfacial medium, the debris (developed during interactive sliding) may cause a larger friction coefficient (CoF) and significant fluctuations under reciprocating sliding [12]. Therefore, in comparison, the tribo-pair in rotary sliding exhibits a stabler friction coefficient (CoF) and better wear resistance and is presumably good for laboratory scale testing [13]. In addition, the stroke of reciprocating sliding is shorter than that of rotary sliding, and the heat dissipation is slower, which intensified the formation and propagation of surface microcracks and the detachment of debris from the matrix which leads to the lot of fluctuation in friction and wear data [14].…”
Section: Methodsmentioning
confidence: 99%
“…Under unidirectional rotary sliding, the severely deformed vortex structure with high microhardness and brittleness was formed in the tribo-layer. The reason for the difficulty in forming the vortex structure in reciprocating sliding may have been the relatively high stacking fault energy and insufficient strain rate [13]. Figure 2 Tribo-testing of Ti6Al4V specimens at Insitu experimental conditions (front and side views).…”
In this work, the dry sliding wear characteristics of Ti6Al4V (Ti64) -EN31 (steel) tribo-pair at incremental sliding velocity (SV, 0.838-1.466 ms -1 ) and load (L, 50-100 N) conditions are elucidated. As evident, specific wear rate (SWR) and coefficient of friction (CoF) increases and decreases, respectively with load and SV. The wear response of Ti64 undergoes a transition from composite type (oxidative and metallic) to delamination. The evolved oxides, viz. TiO and Ti 8 O 15 were majorly in the form of free particulates. At low SV (0.838-1.047 ms -1 ) and low load (50-70 N), the movable particulates can activate a separation effect limiting the damage due to wear. During severe sliding (SV = 1.257-1.466 ms -1 and L = 70-100 N), the combined influence of frictional heating instigated thermal softening, and the formation/retainment of hard-coarse particulates at the interaction zone causes perforation into the substratum, assisting in spalling.
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