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.
Highlights
Fretting wear (FW) is a surface damage phenomenon that results from small oscillating slipping between two contact solid materials
Fretting fatigue (FF) damage is initiated from surface, and surface modification technology is important to strengthen the FF resistance of titanium alloys [7,8,9,10,11,12]
Results indicates that adhesion between the zirconium nitride (ZrN) layer and Ti6Al4V base is metallurgical, which is beneficial for adhesive strength load-bearing ability
Summary
Fretting wear (FW) is a surface damage phenomenon that results from small oscillating slipping between two contact solid materials. Fretting fatigue (FF) is a phenomenon of reducing the fatigue resistance that results from FW in contact with other materials under cyclic loading. The effect of fretting contact has been reported to reduce fatigue strength by 20% to 70% [1,2]. Titanium alloy has a high strength, good thermal stability and fine corrosion resistance and is used to fabricate compressor blades, disks of aviation engines and fasteners. FF damage is initiated from surface, and surface modification technology is important to strengthen the FF resistance of titanium alloys [7,8,9,10,11,12]. It is difficult to improve FF resistance by improving wear resistance and fatigue strength, because technologies to do so are generally inconsistent. Research indicates that nitriding and plasma surface metallurgy could enhance the wear resistance of titanium alloy, but Materials 2016, 9, 217; doi:10.3390/ma9040217 www.mdpi.com/journal/materials indicates that nitriding and plasma surface metallurgy could enhance the wear resistance of titanium alloy, but is not advantageous to plain fatigue and FF behavior, because the treatment reduces the is not advantageous plain fatigue
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