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In this work, precipitation hardening (PH) stainless steel was plasma nitrided at low temperatures 400°C and 425°C for 15h. The wear and corrosion-wear behaviour of the untreated and nitrided specimens were investigated under both dry sliding and wet sliding (in 3% NaCl solution) conditions, using both one-dimensional (1D) and two-dimensional (2D) reciprocating motions. The 2D motion was realised...
In the present work, the unlubricated sliding friction and wear characteristics of thermally oxidized commercially pure titanium have been investigated. Thermal oxidation of CP-Ti was undertaken at a temperature of 625°C for durations of 5, 20 and 72h. This results in a multi-layered structure comprising a titanium dioxide layer (rutile) atop of an α-titanium oxygen diffusion zone (α-Ti(O)). During...
Dry sliding tests for steels were performed in air under the test temperature at 400°C and the loads of 50–250N. The wear behavior and characteristics were focused on to explore their general characters in severe conditions. The wear behavior of various steels presented a common wear regular pattern; a mild-to-severe wear transition occurred with an increase of the load. Because oxidative wear prevailed,...
Co–Cr alloy is one of the most widely used metallic biomaterials for metal-on-metal joint prostheses. However, concerns about increased revision rates associated with large head metal-on-metal replacements have been raised recently. Release of such toxic ions as Cr and Co from corrosion–wear induced nano-sized wear debris has been envisaged as the potential cause. This research was aimed at studying...
The effect of composition and heat treatment (solutionizing at 1200°C and aging at 750°C) on the room temperature mechanical properties (hardness and impact toughness) and dry sliding wear resistance of Fe–0.4C–25Cr–XNi steels (where nominal Ni contents were 4, 12 and 20wt.%) have been investigated. The steel containing 4wt.% Ni had ferritic and others (12 and 20wt.% Ni) had austenitic matrixes along...
The N-pre-implanted 2024 aluminum alloy was implanted with Ti and N, or implanted with Ti, and then with Ti and N by plasma-based ion implantation (PBII) to form two gradient layers, respectively. The composition depth profiles of the gradient layers were characterized by X-ray photoelectron spectroscopy. A series of ball-on-disk wear experiments have been carried out in ambient air, to investigate...
The plain fatigue and fretting fatigue behaviour of a plasma nitrided dual phase stainless steel known as 3CR12 and an AISI 316 austentic stainless steel have been studied in the present work, using a modified Wohler rotating-bending configuration. Test specimens were produced at two nitriding temperatures, namely 400 and 520 o C, representing low temperature and conventional nitriding temperature,...
A low temperature plasma carburising technique has recently been developed to engineer the surfaces of austenitic stainless steels to achieve combined improvement in wear and corrosion resistance. The resultant carburised layer is free from carbide precipitates and contains a single austenite phase supersaturated with carbon. In order to evaluate the tribological behaviour of the carburised layers...
The sliding wear behaviour of plasma nitrided layers produced in AISI 316 type austenitic stainless steel at temperatures between 450 o C and 550 o C has been investigated in the present work. Both dry sliding test with bearing steel and alumina as the counterface and sliding test in a corrosive solution have been conducted. The results show that the sliding wear behaviour of plasma...
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