Study on the tribological properties of titanium alloys sliding against WC-Co during the dry friction

Abstract

Purpose -Titanium alloy has the excellent performance and been widely utilized in aeroengine and airframe manufacture. However, improving the understanding of all aspects of titanium alloy is necessary. The purpose of this paper is to investigate the tribological properties of two typical titanium alloys against tungsten carbide under dry friction. Design/methodology/approach -Reciprocating ball-disc friction tests were carried out at room temperature in different loading without lubricant to investigate the friction properties of TA19/WC-Co and TC18/WC-Co friction pairs. The influence of the load on the friction coefficient and friction force was analyzed. The worn surfaces of TA19 and TC18 specimens were observed by the digital microscopy and scanning electron microscopy (SEM). And the wear mechanism was discussed. Findings -The results show that the friction coefficients decreased with the increase in the normal load. However, the reduction in the friction coefficient for the TC18 alloy was less than that for the TA19 alloy. The dynamic friction forces with time were not quite coincident with the variation trend of the friction coefficients during the sliding friction. The results observed by the SEM and EDS revealed that several grooving were the main type of frictional wear causing the surfaces of the TA19 and TC18 alloys. Originality/value -It is shown in the paper that the tribological property of TA19 alloy was better than that of TC18 when sliding against tungsten carbide under the dry friction conditions. The main types of damage to the TA19/WC-Co friction pair were the ploughing, the delamination fatigue associate with abrasive wear and some diffusive wear. The ploughing and abrasion were the main wear mechanisms for the surface of TC18 alloy.

Dry sliding wear investigation on tungsten carbide particles reinforced iron matrix composites

“…In addition, some very small cracks could be detected on the worn surface. These cracks are provoked by the fatigue of the material and mostly propagated along the eutectic phases as reported by previous studies [31,34,35]. These authors explained that cyclical load could cause fatigue cracks on the interphase or intergrain boundaries after series of cycles.…”

Synergistic lubricating behaviors of graphene and MoS2 dispersed in esterified bio-oil for steel/steel contact

“…This suggests that graphene reduces wear. No clear wear debris was found on the worn surfaces, with a flash observed suggesting that the main wear mechanism was ploughing [36,37]. Steel surfaces lubricated with EBO with 0.5 wt.% MoS 2 contain some spalling pits within worn furrows and heterogeneous wear scars (Fig.10c).…”

Deformation mechanism and tribological behavior of hydrogen-free carburized layer on Ti-6Al-4V alloy

“…Titanium alloys have been widely applied in main parts of aircraft, which can lose the aircraft parts weight, achieve strength ratio improvement and keep on performance guarantee (Bansal et al , 2011). However, their application is limited to a certain extent owing to their poor hardness and wear resistance (Niu et al , 2014). Thus, endowing improved properties on the surfaces of titanium alloys by surface modification technologies are attractive and suitable approaches to overcome the aforementioned issues, such as surface heat-treatment, nitriding, carburizing and electrical discharge machining (Philip et al , 2019, 2020).…”