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The selection of bearing steel surfaces for use with silicon nitride rolling elements within hybrid bearings is critical to the performance and life of such components, which have potential applications in advanced high speed aircraft. The wear and friction performance of these combinations is a major factor currently being considered for the next generation hybrid bearings. This paper reports on...
This paper presents friction tests results of AISI 1006 low-carbon steel and an AISI 52100 bearing steel using a spiral pin-on-disk apparatus. 3mm diameter pins on two average (0.06 or 0.20mm) diameters glass particle coated abrasive paper were used. The normal force applied was 20N, the tangential sliding speed was 0.08m/s, and the radial pin movement was 20mm/min. The micro-indentation hardness...
Silicon nickel, a cast nickel alloy containing about 3% silicon, had been used for threaded couplings in chemical delivery systems for over 40 years because it had necessary corrosion resistance and did not gall when mated with 316 and other stainless steels. In 2001, it was learned that this material was no longer available from long-time sources, and a laboratory study was undertaken to find a substitute...
This paper investigates the wear behaviour of magnesium (Mg)-based metal-matrix composites (MMCs) reinforced with silicon carbide particulates (SiC p ) during dry sliding. Experiments were conducted using a pin-on-disc configuration against a hardened tool-steel counterface under loads of 10 and 30N, and within a sliding velocity range of 0.2-5.0m/s. The composites exhibit slightly superior...
Conventional AISI 420 and high-nitrogen martensitic stainless steels were tested under corrosion-erosion conditions in slurry composed by substitute ocean water and quartz particles. The tests were performed at 0, 25, and 70 o C, with mean impact angles of 20 and 90 o . Polarization tests in H 2 SO 4 solution containing chloride ions were also carried out at the same...
The high fracture toughness and corrosion resistance of Ni 3 Al intermetallic material produces good cavitation resistance. To yield Ni-Al coatings on commonly used metals is beneficial in many aspects. A cathodic arc plasma (CAP) ion plating process was demonstrated to deposit Ni-Al film on AISI 1045 carbon steel to evaluate the cavitation protection. Three target materials with Ni 5...
In thus study the effects of microstructure on wear of multiphase materials is analyzed with reference to titanium carbide-based ceramic-metal composites. The weight fraction of TiC phase in these cermets varied between 0.5 and 0.8. The solid particle erosive wear behavior of TiC-based cermets with different binder phases was investigated. The microstructure of each material was characterized with...
A numerical simulation is proposed of erosion-corrosion phenomena in four-phase flows comprising two immiscible liquids, gas and particulate solid. The simulation geometry is a pipe bend and the evaluated quantity is the wall erosion-corrosion brought about by the flow of a fluid mixture of two liquid phases, one of which is corrosive, plus a gas phase flow and a solid phase. A computational fluid...
Heat treatment, low energy elevated-temperature nitrogen ion implantation, and combination of these techniques were selected to analyze the influence of surface structure parameters on tribological properties of precipitation hardening nickel-based alloys and chromium steels. It was demonstrated that wear resistance of investigated alloys did not correlate well with the surface hardness for both sliding...
A new formulation of the wear coefficient was developed and tested experimentally. Two different types of pin-on-disc wear tests were conducted using three commercial, A6061 aluminum-based metal-matrix composites (MMCs). One type of test resulted in a spiral track and the other a circular track. Hardened tool steel discs were used as the sliding counterface for MMC pins having 10, 15 and 20% alumina...
For applications at extremely low temperatures of a few Kelvin, austenitic FeCrNi alloys usually are employed due to their beneficial mechanical and magnetic properties. These properties depend on the stability of the austenitic microstructure, since transformation into martensite leads to a loss of ductility as well as to the formation of ferromagnetic regions. The necessary conditions for the transformation...
The ball cratering (micro-abrasion) test is becoming popular as a method for the abrasion testing of surface engineered materials. It possesses many advantages over more conventional abrasion tests including the ability to test small volumes of material and thin coatings, its perceived ease of use and the low cost of the test equipment, and its versatility. Standards are now being drafted both in...
This study describes multi-factor-based experiments that were applied to researching and investigating an abrasive wear system of Ni-based alloy coatings both with and without WC reinforcement. The aim of the study was to evaluate the impact of factors such as the load applied, WC reinforcement particles, abrasive grain size and environment on abrasive wear. Our results highlight how the grain size...
In the present paper, an artificial neural network (ANN) approach was applied to the erosive wear data of three polymers, i.e. polyethylene (PE), polyurethane (PUR), and an epoxy modified by hygrothermally decomposed polyurethane (EP-PUR). Three independent datasets of erosive wear measurements and characteristic properties of these polymers were used to train and test the neural networks. For the...
In this paper, results from erosion-corrosion tests performed under liquid-solid erosion conditions in 3.5% NaCl liquid medium are reported. The focus of the paper is to compare the behaviour of Cast and Hot Isostatically Pressed (HIPed) Stellite 6 alloy in terms of their electrochemical corrosion characteristics, their resistance to mechanical degradation and relationship between microstructure and...
The abrasion resistance of fibres is a basic property in the textile industry since the fibres can be damaged during the manufacturing process. To understand the fundamental mechanisms of abrasion of 40μm diameter polyamide fibres, a tribometer using a fibre-cylinder contact configuration immersed in water has been developed. This instrumented device controls tribological parameters such as the sliding...
Galling is a severe type of wear that occurs when relative motion exists between contacting surfaces with extensive local adhesion. The ASTM button-on-block test method for galling resistance of a material couple requires a large number of specimens and an apparatus with very high load capacity for testing at a range of different loads to find the threshold galling stress. In contrast, the galling...
The gas tungsten arc welding (GTAW) process has been widely used in the surface damage reparation of industrial and hydraulic handling components to yield a hardfacing overlay typically composed of nickel based alloys. The pseudoelasticity of TiNi intermetallic alloy provides excellent fatigue resistance and cavitation erosion resistance. GTAW was chosen to yield a TiNi alloy overlay onto AISI 1048...
The Stellite family of Co-based alloys is known to offer superior performance in many demanding sliding contact applications. However, alternative materials with corresponding properties are searched for, e.g. due to the fact that wear and corrosion products of Co run the risk of activation in nuclear plant applications. Furthermore, due to the high price of Co, a competitive, less expensive alloy...
The cavitation erosion behavior of wear resistant hardfacing alloys for nuclear power industry Co-base Stellite 6 and new Fe-base alloy was investigated using 20kHz vibratory cavitation erosion test equipment. Although the crack was initiated at the carbide-matrix interfaces, the matrix hardened by strain-induced phase transformation from austenite to martensite effectively repressed the crack propagation...
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