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Material removal rate from an automotive engine bore surface should not exceed a few nanometers per running hour. This corresponds to the ultra-mild wear (UMW) conditions. Understanding the role of the microstructure on the wear mechanisms in the UMW regime is essential for the development of lightweight automotive engines. In this work, sliding wear tests were performed on a hypereutectic Al–Si alloy...
Three types of waterjet formations were used in this study to evaluate their effects on surface characteristics of a 6061-T6 aluminum alloy. The jet formations were made by using fan jet, fuzzy jet, and round jet nozzles. Surfaces preparation resulting from these types of jet impingements were evaluated using surface profilometry, scanning electron and optical microscopy. Surface characteristics in...
Tool steels produced by powder metallurgy (P/M) processes are technologically well established and are used in various applications. However, the need to improve their surface properties arises when P/M parts are subjected to severe wear. The objective of this work is to study the influence of vanadium on the ion nitriding process and the abrasive wear of ion-nitrided P/M materials. Two P/M alloys;...
The wear of polyethylene cup in hip implants is influenced by a set of primary parameters, which have been reported to lead to loosening of the implant and osteolysis. Mass loss as a result of wear leading to osteolysis may cause dislocation and subsequently revision and/or replacement of the implant. An attempt was made to develop a comprehensive wear rate prediction equation in terms of the implant...
In this study, a wear prediction methodology for spur gears is employed to investigate the influence of material properties on gear tooth wear under unlubricated conditions. The methodology employs a single point observation-based gear contact mechanics in conjunction with the Archard's wear formulation to predict the tooth wear and wear pattern in spur gears. A MATLAB program is developed to account...
TiN/amorphous carbon (a-C) composite films were deposited onto steel substrate by DC magnetron sputtering with different ratios of graphite to Ti in target and at a substrate temperature of 200°C. The hardness, composition, morphology and microstructure of the composite films were characterized by energy dispersive X-ray spectrum (EDS), scanning electron microscopy (SEM) and X-ray diffraction (XRD)...
Cast in situ particle-reinforced aluminum-based composite is characterized by in situ generation of dispersoid particles and also, further value addition due to matrix strengthening caused by alloying. These lightweight composites result in reduced weight when employed in dynamic components, leading thereby to significant fuel economy. Dry sliding behavior of cast in situ Al (Ti)–Al 2 O ...
The abrasion wear resistance of irons may be improved by the incorporation of an extra phase to the matrix, typically consistent of carbides. Nevertheless, the improvement in wear resistance is generally accompanied by a decrease in the impact toughness. The aim of this work is to study the methodology to obtain a controlled precipitation of carbides in a ductile cast iron that is subsequently austempered,...
This paper addresses the influence of the partial slip phenomenon on the dynamic motion of a spherical workpiece held in a fixture with application to machining fixture design. The model considers the effect of interfacial slip damping arising from partial slip at a spherical–planar frictional contact subjected to a constant normal load and oscillating tangential load. The model can be used in both...
Oleic acid-modified copper sulfide nanoparticles were prepared by means of a surface modification technique in absolute alcohol–distilled water mixed solution. Through varying the mole ratio of surface modifier to copper sulfide, a series of nanoparticles were prepared with the mole ratio of 0.5:1, 1:1, 2:1, 3:1. The friction–reduction and antiwear behaviors of the prepared nanoparticles as an oil...
Railway wheels are subject to high hydrostatic pressure and tangential stresses resulting in plastic deformation and wear. The present study focuses on the initial shakedown, i.e., running-in, period of wheel material and on a procedure of bogie direction reversal. This paper aims to show the importance of two domains of moving a wheelset, which are contact mechanics and operational aspect in the...
A study was undertaken to investigate the wear of PVD-coated carbide and uncoated carbide tools during milling of STAVAX (modified AISI 420 stainless steel) at low speeds. No significant change in the tool wear was observed when the cutting speed was increased from 25 to 50m/min. It was found that increasing the hardness of the workpiece from 35 to 55HRC caused a marked increase in the flank wear...
The problem with the Vite et al. [M. Vite, M. Castillo, L.H. Hernández, G. Villa, I.H. Cruz, D. Stéphane, Dry and wet abrasive resistance of Inconel 600 and stellite, Wear 258 (2005) 70–76] is with the main concept, which is the intention to use Inconel alloy to replace Stellite alloy as hardfacing material for severe abrasive applications. The cost of hardfacing material is only a small part of a...
Lapping is a finishing process, in which material removal takes place due to relative motion between the workpiece, loose abrasive grains, and the lapping plate. This process is used in achieving finer surfaces and closer fits, correction of minor imperfections, and maintaining close tolerances. Although a significant underlying science-base exists with regards to the physics, mechanics, dynamics,...
Polyester composites reinforced with three different weight fractions of woven E-glass fiber reinforcement are developed. To study the effect of various operational and material parameters on erosive wear behavior of these composites in an interacting environment erosion tests are carried out. For this purpose, air jet type erosion test rig and the design of experiments approach utilizing Taguchi's...
The tribo-potential of sugarcane fibre reinforcement in the thermoset polymers for enhancing the adhesive wear resistance has not been explored so far. Hence, the present work aims to explore the possibility of using this natural fibre to reinforce polyester and thus opens a new way to implement locally available inexpensive fibres and produce a new candidate tribo-material for bearing applications...
TiN coatings were deposited on austenitic stainless steel, X6CrNiTi18-10, by means of the cathodic arc evaporation method at three different substrate temperature: 200°C, 350°C and 500°C. All coatings were found to have strong (111) crystallographic orientation and fine crystalline structure of the δ-TiN phase. The substrate temperature was found to have an influence on the hardness and Young's modulus...
As a result of recent technological advances in high-sensitivity magnetic sensors, state of the art magnetometers, make it possible to obtain new assessment measurements of the near-surface layers (5–60μm) in fretting damage zone. In particular, the experimental method used in this investigation is based on magnetic sensing of local thermoelectric currents produced by material imperfections such as...
Dry sliding tests were performed on as-cast magnesium alloys Mg 97 Zn 1 Y 2 and AZ91 using a pin-on-disc configuration. Coefficients of friction and wear rates were measured within a load range of 20–380 and 20–240N at a sliding velocity of 0.785m/s. X-ray differactometer, scanning electron microscopy, tensile testing machine were used to characterize the microstructures and...
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