Wear Characteristics of Sintered Cermets

Bidulský, Róbert; Bidulská, Jana; Arenas, Freddy; Grande, Marco Actis

doi:10.1515/htmp.2011.123

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…Several authors [46][47][48] present suggestions for correlation of wear behaviour with the surface topography. The fact that surface wear is influenced by sub-surface deformation [49][50][51][52][53][54] was also effectively used to show the occurrence of delamination and fracture of material resulting in its removal.…”

Section: Study Of Tribological Propertiesmentioning

confidence: 99%

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

Kvačkaj¹,

Kováčová²,

Bidulská³

et al. 2015

Archives of Metallurgy and Materials

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In this study, static, dynamic and tribological properties of ultrafine-grained (UFG) oxygen-free high thermal conductivity (OFHC) copper were investigated in detail. In order to evaluate the mechanical behaviour at different strain rates, OFHC copper was tested using two devices resulting in static and dynamic regimes. Moreover, the copper was subjected to two different processing methods, which made possible to study the influence of structure. The study of strain rate and microstructure was focused on progress in the mechanical properties after tensile tests. It was found that the strain rate is an important parameter affecting mechanical properties of copper. The ultimate tensile strength increased with the strain rate increasing and this effect was more visible at high strain rates (ε ∼10 2 s −1 ). However, the reduction of area had a different progress depending on microstructural features of materials (coarse-grained vs. ultrafine-grained structure) and introduced strain rate conditions during plastic deformation (static vs. dynamic regime). The wear behaviour of copper was investigated through pin-on-disk tests. The wear tracks examination showed that the delamination and the mild oxidational wears are the main wear mechanisms.Keywords: OFHC copper, UFG, ECAP, strain rate, fractography, wear resistance W pracy zbadano szczegółowo statyczne, dynamiczne i tribologiczne właściwości ultra drobnoziarnistej (UFG) beztlenowej miedzi o wysokiej przewodności cieplnej (OFHC). W celu oceny właściwości mechanicznych przy różnych szybkościach odkształcenia, miedź OFHC badano za pomocą dwóch urządzeń w warunkach statycznych i dynamicznych. Ponadto miedź poddano dwóm różnym sposobom przetwarzania, co umożliwiło badanie wpływu struktury. Badanie szybkości odkształcenia i mikrostruktury koncentrowało się na zmianie właściwości mechanicznych po próbie rozciągania. Stwierdzono, że szybkość odkształcania jest ważnym parametrem wpływającym na właściwości mechaniczne miedzi. Wytrzymałość na rozciąganie wzrosła ze wzrostem szybkości odkształcenia i ten efekt był bardziej widocznyprzy dużej szybkości odkształcania (ε ∼10 2 s −1 ). Jednak zmniejszenie obrazu przebiegało inaczej w zależności od cech mikrostruktury materiałów (struktura gruboziarnista a struktura ultra drobnoziarnista) i zadanych warunków szybkości odkształcenia podczas odkształcenia plastycznego (warunki statyczne a warunki dynamiczne). Zużycie miedzi badano za pomocą testów zarysowania. Badanie ścieżek zużycia wykazało, że delaminacja i umiarkowane utlenienie to główne mechanizmy zużycia.

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Section: Study Of Tribological Propertiesmentioning

confidence: 99%

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

Kvačkaj¹,

Kováčová²,

Bidulská³

et al. 2015

Archives of Metallurgy and Materials

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“…A wellestablished hard chrome replacement for mechanical components in automotive and aerospace industry is represented by HVOF method, but the application of this process to tooling materials has been limited [7]. Within this method, the abrasive wear resistance strongly increases by the addition of tungsten carbide into the metallic matrix [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Investigations on Coating of Dies for Advanced Squeeze Casting Process

Peter¹,

Rosso²,

Castella³

2014

Acta Metall Slovaca

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Premature failure of dies is a critical problem of manufacturers in hot-working processes, e.g. metal die casting, hot extrusion and/or thixoextrusion of aluminium/magnesium or steel. Typically, die material has to be resistant to heat cycling or corrosion environment, to plastic deformation and wear, especially when exposed to high temperature during continuous working cycle. The resistance of dies could be increased by the modification of their surfaces, i.e. by the application of an adequate coating. An improvement of the resistance of H11 steel substrate will be presented and discussed. Here, the coatings will be realized through both by High Velocity Oxy-Fuel coating spray method and by plasma spray method. Firstly, the measurement of the residual stress will be carried out on the un-coated and coated substrate. Secondly, morphological analysis by optical and scanning electron microscopy will be performed on the powders used for the coating and on the coated materials. Such investigations aim finding the most favourable conditions, as concern the materials to be employed for the deposition and the more appropriate deposition techniques, in order to achieve improved properties for the dies which can be used in innovative casting techniques, i.e. squeeze casting and/or some related modified processes. Keywords:Al-based alloys, deposition methods, morphological analysis, residual stress measurment IntroductionDegradation of hot working components is directly correlated to the design, materials employed for the manufacturing as well as the operation history. High reactivity of steel with Al and its alloys as a consequence of the high solubility of Al in α-Fe and of Fe in liquid Al has a strong effect on the dies lifetime. As a result of the repeated contact of the die surface and the casting alloy dies are continuously exposed to erosion and corrosion. Due to different degradation mechanisms attributed to wear, as well as to corrosion-or thermo mechanical fatigue during service, a gradual failure of the die surfaces occurs, reducing the castings quality and the dies duration. The tool materials used for hot-working dies should be resistant to wear, heat cycling and thermal fatigue, plastic deformation and corrosion. In addition, they have to present high hardness, yield strength, creep resistance and toughness at high temperatures. In order to minimize or to avoid the die surface from any negative effects, the dies have to be produced employing an appropriate alloy or by modifying their surfaces through some suitable treatments. Many technological solutions are available today: some of them are related to nitriding

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