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This work shows the successful application of a novel Fe85Cr4Mo8V2C1 (wt%) laser cladding wire material on a high-performance tool steel (1.2379, X155CrMo12-1) using a pulsed Nd:YAG laser system. Due to the high cooling rates during the welding process and appropriate laser parameters, a fine, homogeneous microstructure composed of martensite, austenite as well as VC- and Mo2C-type carbides was formed...
There are two basic options for improvement of surfaces of heat treated tool steels for cold working: mechanical treatment such as burnishing, or else chemical modification such as nitriding. The latter is affected not only by the nature of the chemical agent but also by diffusivity of that agent through the steel. We focus first on the number and order of operations performed on the steel surfaces:...
Due to its wear resistance, functionally graded ductile iron (FGDI) is a potential material for automotive brake pads. In this investigation it was studied (i) under well controlled sliding conditions in a typical tribological model-test to show in detail the mechanism behind improved wear resistance, namely the “property on-demand” functionality in the sub-surface zone and (ii) in a validation experiment...
Previous studies have shown promising tribological performance and thermal properties of nano particles and ionic liquids when they were used separately as oil additives. However, the use of ionic liquid as a nanofluid surfactant has been rarely studied. This work investigates oil based ZnO and WS2 nanofluid tribological properties using two different surfactants: oleic acid and ionic liquid. ZnO...
A new approach to construct photocatalytic air-purifying asphalt pavements coated with TiO2 modified aggregate was developed and its feasibility and performance were evaluated. Two methods, namely the surface coating and pore filling methods, were adopted to produce the TiO2 modified aggregate. Their photocatalytic efficiency and mechanical performance under vehicle tire polishing, applied by an Aachen...
Material removal factor, fab, is defined by ZumGahr as “the ratio of volume of wear debris to the volume of wear groove produced”. It appears in the literature within the context of abrasive wear, usually as a possible indication of prevailing mechanisms such as plowing, wedge formation and cutting. Microcracking, an important mechanism in the abrasion of brittle material such as highly hardened steels...
The ability to estimate grinding process responses, like the surface roughness, specific energy, cutting forces and temperature, is essential to understand and optimize abrasive grinding. Several models to predict the process behavior with various input parameters have been published. In all of them, the number of active grits per unit area is an important parameter; however, this parameter has been...
The influence of lubricant additives on rolling contact fatigue crack propagation and the mechanisms responsible for the resulting micro-scale damage, was studied via experiments conducted on complete transmissions in a test cell. Bench-scale tribological tests and the exposure of steel surfaces to two different formulated lubricants were also carried out. Scanning and Transmission Electronic Microscopy...
Chip-sprinkling cement concrete (CSCC) pavement can provide satisfactory friction and has potential for noise attenuation due to its exposed surface texture, making abrasion resistance significant. The abrasion resistance of CSCC pavement was evaluated using the Cantabro test method, with smooth surface concrete as the control group. This method uses a Los Angeles Abrasion Machine without steel balls...
Nanocrystalline Al-Ni-Gd-Co alloys with exceptionally high hardness have been recently developed from amorphous precursors. In the present work, the reciprocating sliding wear in the gross slip regime of these novel nanocrystalline Al-based alloys has been investigated under small amplitude oscillatory sliding motion using a martensitic chrome steel as the counter material. When compared to pure Al...
In this research, an experimental study on impact by an ice particle was performed. Aluminum alloys were impacted by spherical ice particles with a diameter of 2mm launched using a two-stage light gas gun. Maximum impact pressure was measured using photon Doppler velocimetry in a velocity range up to approximately 800m/s. The maximum impact pressure was found to be approximately 4.57 times the theoretical...
Oil and gas production and transportation facilities have the potential of catastrophic explosions, fire and release of toxic gases due to erosion failures which may lead to loss of lives and properties. Repairs of such a complex system can be very expensive and troublesome. Therefore, control of erosion is a subject of paramount interest in the oil and gas production/transportation industry.Reliable...
Aromatic Thermosetting Polyester (ATSP)-based coatings exhibit extremely low wear rates (4.15×10-8mm3/Nm) under boundary lubrication simulating tilting pad bearings in harsh conditions. It is acknowledged that coatings’ resistance to abrasive particles encountered in the bearing is also critical; the abrasive wear resistance of ATSP-based coatings and polyether ether ketone(PEEK)-based coatings are...
In order to improve the tribological properties of 316LVM medical grade stainless steel, TiN and DLC coatings were deposited. The TiN coating was prepared by CAE-PVD (Cathodic Arc Evaporation), whereas DLC was deposited by the PACVD (Plasma-Assisted Chemical Vapor Deposition) technique. Surface roughness, nanohardness, and anti-wear performance for both coated and unmodified specimens, as well as...
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