Effects of Plasma ZrN Metallurgy and Shot Peening Duplex Treatment on Fretting Wear and Fretting Fatigue Behavior of Ti6Al4V Alloy

Abstract

A metallurgical zirconium nitride (ZrN) layer was fabricated using glow metallurgy using nitriding with zirconiuming prior treatment of the Ti6Al4V alloy. The microstructure, composition and microhardness of the corresponding layer were studied. The influence of this treatment on fretting wear (FW) and fretting fatigue (FF) behavior of the Ti6Al4V alloy was studied. The composite layer consisted of an 8-μm-thick ZrN compound layer and a 50-μm-thick nitrogen-rich Zr–Ti solid solution layer. The surface microhardness of the composite layer is 1775 HK0.1. A gradient in cross-sectional microhardness distribution exists in the layer. The plasma ZrN metallurgical layer improves the FW resistance of the Ti6Al4V alloy, but reduces the base FF resistance. This occurs because the improvement in surface hardness results in lowering of the toughness and increasing in the notch sensitivity. Compared with shot peening treatment, plasma ZrN metallurgy and shot peening composite treatment improves the FW resistance and enhances the FF resistance of the Ti6Al4V alloy. This is attributed to the introduction of a compressive stress field. The combination of toughness, strength, FW resistance and fatigue resistance enhance the FF resistance for titanium alloy.

Effects of WC-17Co Coating Combined with Shot Peening Treatment on Fatigue Behaviors of TC21 Titanium Alloy

“…The toughness of these coatings can be improved via the shot peening process, and the corresponding fatigue resistance is higher than those of the polished coating and the TC21 titanium alloy substrate samples ( Figure 9 ). The improved fatigue property of the polished WC-17Co coatings, subjected to a shot peening after-treatment, results from surface hardening and a compressive residual stress that inhibit fatigue crack initiation and retard fatigue crack propagation [ 16 , 17 , 18 ], respectively.…”

“…Cracking and delamination of the coatings, owing to the high impact energy of the treatment, resulted in relaxation of the residual compressive stress. Fatigue cracks were easily formed in these coatings, and crack propagation was extensive [ 16 , 17 , 18 ]. A smooth surface ( Figure 4 and Figure 5 ) and significant hardening ( Figure 6 ) were realized via moderate shot peening (SP2).…”

Surface Texture-Based Surface Treatments on Ti6Al4V Titanium Alloys for Tribological and Biological Applications: A Mini Review

“…However, Ti6Al4V cannot meet all of the engineering demands, e.g., it is seldom operated in tribological-related engineering conditions due to its drawbacks of low surface hardness, high coefficient of friction, and poor abrasive wear resistance. These shortcomings have greatly limited or even prevented Ti6Al4V larger scale use for various applications [ 9 , 10 , 11 , 12 , 13 ]. It is well known that degradation/failure of materials in engineering, e.g., wear and/or corrosion are mainly determined by the surface performance of the material rather than by bulk properties.…”

Surface damage mitigation of Ti6Al4V alloy via thermal oxidation for oil and gas exploitation application: characterization of the microstructure and evaluation of the surface performance

“…16 A variety of surface treatment technologies, such as thermochemical surface treatment, micro arc oxidation (MAO)/plasma electrolytic oxidation (PEO), physical vapor deposition (PVD), chemical vapor deposition (CVD), ion implantation, thermal spraying, thermal oxidation (TO), laser surface treatment and electrospark deposition (ESD), and several duplex treatments have been conducted to improve the surface performance of titanium and its alloys. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] Among the mentioned surface treatment technologies, thermal oxidation (TO) is an ideal surface technique that has been industrially used to strengthen the Ti-based materials. 31 Its popularity is mainly assign to its cost effectiveness, simplicity and rapidity.…”