Tribological Behavior of Titanium Alloy Treated by Nitriding and Surface Texturing Composite Technology

Abstract

This study experimentally investigated the effect of surface textures on the tribological mechanism of nitrided titanium alloy (Ti–6Al–4V). The titanium alloy samples were nitrided at various temperatures ranging from 750 to 950 °C for 10 h in a plasma nitriding furnace. Then, surface textures were fabricated on the polished titanium alloy and plasma nitrided samples by laser process system. The surface roughness, microhardness, and constitution of samples treated by single nitriding and samples treated by composite technology were characterized. The tribological properties of the samples were investigated on a CSM ball-on-disc tribometer. The results show that plasma nitriding effectively enhances the wear resistance of the substrate. The wear rate decreases first and then increases with the increase of nitriding temperature, and the wear rate reaches the minimum at 900 °C. However, the increase in roughness caused by nitriding treatment leads to an increase in the friction coefficient. It is found that surface textures can obviously reduce the friction coefficient of the nitrided titanium alloy. In addition, it can also reduce the wear rate of titanium alloys after nitriding at 900 and 950 °C. It can be concluded that the nitriding and surface texturing combined treatment can obviously reduce the friction coefficient and wear rate at the nitriding temperatures of 900 and 950 °C. This is attributed to the combined effect of high hardness of nitride layers and the function of micro-trap for wear debris of surface textures.

Surface, Subsurface and Tribological Properties of Ti6Al4V Alloy Shot Peened under Different Parameters

“…The polished samples were cleaned in an ultrasonic bath for 15 min with alcohol. For cross-sectional microstructural examinations, as-polished samples were etched (Kroll etch (2 mL HF, 4 mL HNO 3 , 92 mL H 2 O) [ 77 ]) for 5 s and were analysed using a scanning electron microscope (SEM) (Tescan Vega 2, Brno-Kohoutovice, Czechia). The effect of shot peening parameters on surface and subsurface hardness distribution depending on depth were measured (Zeiss micro Vickers hardness tester, Oberkochen, Germany) in HV 0.1 , 15 s, and five replicates.…”

Tribological Capabilities of Graphene and Titanium Dioxide Nano Additives in Solid and Liquid Base Lubricants

“…Titanium and its oxides from macro to nano scale are widely used by different industries because of their high strength, corrosion resistant nature, bio compatibility, and cost effectiveness [12,13]. For example, titanium powder is used by the marine, aeronautical, chemical, paint, and machinery industries to prevent rust and improve strength without adding more weight to the structure [12,14]. Sunscreen lotion contains a high amount of titanium dioxide to protect the skin from UVB and UVA2 rays [14,15].…”

“…Sunscreen lotion contains a high amount of titanium dioxide to protect the skin from UVB and UVA2 rays [14,15]. However, titanium has a bad reputation in terms of sliding tribology, due to unstable friction and wear, and higher chances of seizing [12,13]. As per stability tests and microscopy findings, 36% of nano particles should be smaller than 100 nm for high dispersibility in the water [15].…”

Laser Polishing of Additive Manufactured 316L Stainless Steel Synthesized by Selective Laser Melting

“…The researcher indicated an improvement in the surface mechanical properties such as the micro-hardness and the wear resistance. The laser polishing of different metals has been investigated by several researchers in order to produce a better understanding of the effect of the input processing parameters and to relate them to the modified surface characteristics [34,35]. In order to fill the gap of information available for 316L stainless steel, this paper presents a study of the effect of laser polishing parameters of 316L stainless steel alloy on the resulting surface properties.…”