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The present work examines the abrasive and the erosive wear performance of WC–12Co microwave clads. Cladding of micrometric and nanometric WC–12Co powders was carried out on austenitic stainless steel substrate using microwave hybrid heating technique. The micrometric clads exhibited the presence of skeleton structured carbides uniformly distributed in the metallic matrix. On the other hand, presence...
The dry grinding of metals is a common machining operation. The main issue with such techniques is metal adhesion on the abrasive tool, which decreases the material removal rate. In this work, the effect of active filler metal loading with materials such as cryolite and KBF4, which are present in the resin of commercial abrasive belts, was studied. Grinding belt experiments and friction tests were...
Zr-based bulk metallic glasses (BMGs), especially Zr41Ti14Cu12.5Ni10Be22.5, are widely used as mechanical components due to their simple preparation process and excellent properties. In this study, the tribological properties of Zr41Ti14Cu12.5Ni10Be22.5 pins and different counterpart materials (AISI 5120 steel, AISI 52100 steel and Zr41Ti14Cu12.5Ni10Be22.5 amorphous discs) were investigated using...
Micro-scale wear characteristics of ultra-fine gold wires with a diameter of ~28μm was investigated under a low contact force over a long sliding distance up to ~200km. The tip of the wire was slid against a silicon wafer under a low normal force of 5μN. Wear of the gold wire was quantified from the images of the tip obtained by a 3D laser microscope and a scanning electron microscope before and after...
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...
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...
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...
WC–Co–Cr thermal spray coatings are possible replacements for hard chrome plating on aircraft landing gear because of their superior wear resistance and environmentally friendly properties. In this study, four HVOF spray WC–10Co–4Cr coatings were deposited. During deposition, WC (tungsten carbide) particles were mixed into the coating. These included two types of single particle size distributions...
Poly-ether-ether-ketone (PEEK) is a high-performance, temperature-resistance polymer that is finding an increasing range of applications. In order to even enhance PEEK׳s mechanical and tribological properties particles of different compositions, shapes and sizes are added into its matrix. PEEK has already been combined with many different particles; however, very rarely MoS2 and WS2 – two state-of-the-art...
Decarburization can remain on the surfaces of rail head steels and affect their wear and damage processes. The current research explored the influence of a decarburized layer on wear resistance and damage behavior of rail materials using a rolling–sliding wear testing machine. A decarburized layer decreases the hardness and wear resistance of rail steels, and the wear rate of a decarburized rail is...
The objective of this study is to explore the wear and rolling contact fatigue (RCF) characteristics of wheel materials under different operating speeds conditions using a small scale wheel/rail facility. The results indicate that the operating speed plays a vital role in the wear and RCF of wheel materials. As the operating speed increases, both the surface hardness and the hardness of the plastic...
The objective of this study is to evaluate the effect of slip ratio on the wear and rolling contact fatigue (RCF) of wheel/rail materials using a rolling–sliding wear testing apparatus. The results indicate that two wear types are presented in terms of wear rate: type I (mild wear) and type II (severe wear). In type I wear, cracks propagate parallel to the surface. While in type II, the peeling is...
The present work investigates the alternate corrosion and wear effect on the overall degradation of a dual phase and a mild steel. In case of corrosion-wear, immersion corroded samples of both the steels in freely aerated 3.5wt% NaCl solution are subjected to reciprocating sliding wear at three different loads. In case of wear-corrosion, wear takes place first in the steel samples, which are then...
Wear measurement of rolling contact during running-in is challenging because the mass loss is minor and the wear track change is almost undetectable. To overcome this limitation, wear is monitored by measuring the nano-scale deformation of the surface asperities of the roller in a rolling contact using the infinite focus microscope (IFM). An accurate surface image repositioning method is achieved...
High-Interstitial Fe–Cr–Mn–C–N stainless steels, CN66 (C+N=0.28+0.38wt%) and CN71 (C+N=0.27+0.44wt%), were produced in an induction melting furnace and cast in air atmosphere. The abrasive wear resistance of CN66 and CN71 was investigated as a function of heat treatment conditions, subsequent to casting. The wear rate of CN66 decreased from 0.107 to 0.095mm3/m. with a heat treatment of 1200°C solutionizing...
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