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Selective laser melting is an additive manufacturing technology that produces metal parts; 316L stainless steel is one of the most widely used material in the selective laser melting process. The tribology performance of selective laser melting processed parts is critically important for industrial applications but related studies are rare. In this study, friction and wear behaviors of 316L stainless...
Bronze-on-steel couples are commonly used in worm gearing, but alternative material combinations may provide better performance in terms of wear. Lubricated rolling–sliding tests were therefore carried out on GJS700 nodular cast iron and 42CrMo4V quenched and tempered steel. The tests were performed in the disk-on-disk configuration with the applied load, rolling–sliding ratio and lubrication selected...
The influence of TiN coating thickness on the rolling contact fatigue (RCF) behavior of austempered ductile iron (ADI) was investigated. Coatings were applied in an industrial PVD reactor using processing parameters specifically selected for ADI. Deposition times were adjusted to obtain nominal thicknesses of 0.7, 1.4 and 2.1µm. RCF tests were performed in a flat washer type testing rig under a lubricated...
The focus of this work was to evaluate the use of a WC/a-C:H coating, specifically designed to withstand rolling contact fatigue, to mitigate micropitting damage on through-hardened AISI 52100 bearing steel. This was accomplished by conducting experiments with various combinations of coated discs and rollers using a three-disc-on-roller rolling contact fatigue machine. In addition to testing coated...
The final quality of solid wood molding depends on several factors, where the choice of cutting conditions and consequently the tool performance are key points when processing this type of material because tool wear affects physical–chemical and thermodynamic behavior of the surface submitted to coating. One of the main problems at the production line is to achieve an adequate monitoring system of...
Protective coatings for high temperature applications have to exhibit good oxidation resistance and microstructure stability. The effective protection of parts with hardfacing techniques depends on the impact of the substrate on the deposited alloy, typically assessed by dilution. This investigation aims to evaluate the effect of dilution on microstructure and high temperature wear of NiCrSiBC coatings...
The purpose of this study is to characterize the influence of specific micro-indentation test methods and frictional behavior on the viscoelastic properties of polyester fiberglass composite. Previous work shows that viscoelastic parameters for neat thermoset polymers can be successfully determined using a recently developed phenomenological model. In this study, similar depth sensing micro-indentation...
The dry sliding wear behavior and mechanisms in a bulk metallic glass composite, Ti48Zr20V12Cu5Be15, composed of in situ crystalline dendrites in an amorphous matrix, was studied in reciprocating mode against a WC counterface loaded at 5N and 10N. The composite showed higher wear rates but lower coefficient of friction compared to a monolithic fully amorphous glass. Nanomechanical characterization...
Slag pots are commonly used for the transportation of liquid slag from steel mills to slag dumps. A detailed failure analysis of slag pots is required to determine effects limiting their lifetime. Temperature measurements were implemented throughout an ongoing operation to quantify thermal loading. Different microscopy methods, cross sectional analyses and hardness measurements were performed on a...
Although samples are visibly clean, organic deposits could have tremendous impacts on tribological measurements and interpretation of friction and wear behaviors. This paper discusses the boundary lubrication effects of invisible residues from organic solvents that have been widely used in tribological studies in ambient conditions. Stainless steel, soda lime glass, and copper substrates were cleaned...
The abrasive wear resistance of four distinct metallurgical steel microstructures – bainite, pearlite, martensite and tempered martensite, with similar hardness levels was investigated. A pin-on-disc tribometer was used to simulate the two-body abrasive condition (i.e. the metallic surface abrading against the silicon carbide abrasive particles) and evaluate the specific wear rate of the microstructures...
The goal of reducing CO2 emissions in the automobile industry has led to the development of increasingly efficient lightweight material solutions that yield enhanced performance. In light of this goal, this current work involves the optimization of the pre-conditioning of novel, high toughness steel bearings without thermo-chemical treatments, with the aim of transferring the running-in phase into...
Comparative experiments involving processing SiC substrates with the semi-fixed and the fixed diamond abrasive polishing tool have been conducted in this study. The material removal mechanisms of SiC substrates are investigated by the surface topography of substrate, the wear appearance of abrasives in tools and the analysis of wear debris. The results indicate that the removal scale of diamond grits...
Optimizing the MoS2-based coating to overcome its humidity sensitivity is still a challenge. In this work, MoS2/Pb composite coatings with various Pb contents were synthesized by unbalanced magnetron sputtering system. The microstructures of the coatings change from loose columnar structure for pure MoS2 to a compact featureless structure for Pb doped MoS2. The hardness and elastic modulus of the...
Detailed understanding of wear processes is required to improve the wear resistance and lifetime of machine components. Atomic force microscopy (AFM) is used to measure surface height profiles with high precision, before and after a wear experiment. The distribution and depth of wear on steel surfaces is then calculated using a relocation method. A numerical investigation of wear based on Archard׳s...
The dry sliding wear behavior and wear mechanisms of near-β Ti–10V–2Fe–3Al alloy were investigated with respect to its superelastic characteristics. The β-annealed Ti–10V–2Fe–3Al alloy exhibited high recoverable elastic deformation, e.g., maximum recovery ratio of 90% at 200mN load during indentation tests using a diamond Rockwell stylus (200µm radius). Wear tests were carried out under unlubricated...
The purposes of this work were: (i) to understand how erosive wear is affected by the random meso structure of concrete, and (ii) to develop a model for erosive wear of concrete structures due to the action of sediment bearing water loads. An aggregate generation algorithm with certain novel features is used to generate a database comprising 400,000 aggregates with varying levels of angularity and...
TiC-based cermets are heavily utilised in applications demanding good resistance to both wear and corrosion. In the current work, TiC-stainless steel (grade 316L) cermets have been developed, with the TiC grain size varied through heat-treatment, for steel binder contents between 10 and 30vol%. Microstructural analysis showed mean TiC grain sizes of ~4 and 10μm, respectively, for fine- and coarse-grained...
The effects of compositional modifications on the sliding friction and wear against bearing steel were investigated for newly-developed binary and ternary epoxy composites. Some of the new materials included hexamethylene diisocyanate (HDI) filled microcapsules and wax filled microcapsules, and others used HDI filled microcapsules, wax filled microcapsules and short carbon fibers (SCFs) at different...
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