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Water cavitation jet peening (WCP) uses cavitation caused by the shear layer created by two concentric co-flowing jets with large velocity difference to introduce compressive residual stresses in the surface layers of metal components subjected to fatigue loading or a corrosive environment. Mass loss and surface alteration in WCP have been shown to be minimal compared to other mechanical surface enhancement...
This paper presents a theoretical and experimental investigation which attempts to provide a better scientific understanding of the material removal characteristics and surface generation in bonnet polishing. The experimental results reveal that the material removal is shared by the polishing pad and the abrasives trapped in the pad-workpiece interface, and the abrasive wear is dominated significantly...
A novel type of graphite (thermographite) having higher thermal conductivity (TC) due to a patented treatment is commercialized recently. It was anticipated that such particles would be more effective in conducting away frictional heat generated on the tribo-surfaces leading to the enhanced performance. Hence two composites were developed based on high performance Polyarylether ketone (PAEK) (50%...
The presence of galling is always detrimental when sheet metal forming advanced high strength steel (AHSS). Galling tends to reduce tool life, degrade the quality of components, and increase scrap rate of production. To prevent or postpone the initiation of galling and thereby extend the service life of DC53 tool steel forming tools, surface modification techniques like nitriding treatment and thermal...
The friction and wear properties of the nitrided steel at different electrochemical potentials of the rubbed surface have maintained interesting and still an unsolved problem. This study systematically investigated the friction and wear behavior under different potentials for the nitrided AISI 4340 low alloy steel lubricated by propylene carbonate with an additive of imidazolium ionic liquid. A nitrided...
Based on a detailed study of Leonardo da Vinci׳s notebooks, this review examines the development of his understanding of the laws of friction and their application. His work on friction originated in studies of the rotational resistance of axles and the mechanics of screw threads. He pursued the topic for more than 20 years, incorporating his empirical knowledge of friction into models for several...
In the present work, the wear behaviour of different steels has been investigated under a three body abrasive environment at room and elevated temperatures. High-silicon steel (0.25C–1.42Si) was austempered at 300 and 320°C in order to obtain two carbide-free bainitic steels with different mechanical properties. The same steel subjected to two different quench and temper heat treatments was used as...
In the last years several consumables which deposit hard nanostructured iron-based alloys with high resistance to abrasive wear have been developed. The microstructure of the weld metal usually shows variations with the welding procedure, particularly related to the heat input, number of layers and shielding gas type. The purpose of this work was to study the microstructural evolution and wear resistance...
Al2O3/Mo self-lubricating structural ceramics with laminated-structure are potential candidates for high-temperature applications because of their excellent self-lubricating and mechanical performances. This study aims at revealing the mechanisms of how a three-dimensional lubricating layer affects the tribological properties of Al2O3/Mo laminated composites at temperatures from 25 to 800°C. A three-dimensional...
Solid particle erosion in elbows is a prominent problem encountered in hydrocarbon transportation pipelines, especially for dry gas and gas–mist flows. There is great difference in flow conditions between model experiments and engineering. A set of similarity criteria is proposed to analyze the corresponding relationship between engineering conditions and that in laboratory tests. The similarity criteria...
Downsizing in mechanical systems requires effective lubrication strategies to ensure that increased contact stresses do not cause critical material failure during operation. Additionally, eco-toxicological considerations are becoming increasingly important. In this regard, the goal of this investigation is to transfer the running-in phase into the final step of the mechanical finishing process through...
This study focuses on the damage mechanisms in silicon nitride rolling elements used in hybrid (ceramic–metal) bearings that operate under non-conformal contact. To get an insight into the prevailing damage modes compared to the real application, a rolling contact experiment was designed to mimic the contact conditions. Hertzian contact pressures ranged from 3.0 to 5.9GPa (500–4150N). In order to...
The role of shoe wear on the tendency to slips and falls has been less studied than the contributions of floor surfaces to fall-related injuries. The purpose of this study was to better understand the principal aspects of shoe wear mechanisms and to identify the associated tribological characteristics of shoe/walking surface frictional behaviour. Dynamic friction tests were conducted amongst four...
High interstitial CrMnCN austenitic stainless steels combine superior mechanical properties with high resistance to corrosion. The first is caused by the strengthening effect of C and N and the low stacking fault energy leading to intense cold work hardening and e.g. increased resistance to fatigue, which implies a high resistance to cavitation erosion. Corrosion resistance is provided by the elements...
The tribological behavior of polished and lapped 56NiMoCrV7 and Ck45 disks with lubrication was studied to link the impact of initial near-surface microstructure to the running-in behavior of the systems. The tests were performed using a pin-on-disk tribometer with radionuclide technique to resolve ultra-low wear rates. For the running-in different stressing regimes were applied. Whereas the lapped...
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