Papers by Keyword: Abrasive Wear Resistance

Abstract: The effect of quenching from 900°C (20 min exposure) and different tempering in the 250-650°C (for 1 hour) interval, as well as additionally preliminary carburization for 8 hours at 930°C, followed by a similar heat treatment on abrasive and shock-abrasive wear of low-carbon manganese (10-24%Mn) steels, phase composition and mechanical properties was studied. It was confirmed that an increase in the manganese reduces the abrasive wear resistance and increases the impact-abrasive wear resistance. The expediency of carburization of low-carbon manganese steels is shown in order to obtain the residual austenite in the structure which amount and stability must be optimized in relation to specific abrasive impact characterized by the dynamic ratio with taking into account the chemical composition.

Abstract: A method of arc surfacing with a consumable electrode and a flux-cored wire containing titanium nitride micro-and nanoparticles added to the weld pool was developed. The influence of the modifier on the structure and properties of the deposited coatings was studied.

Abstract: A wear-resistant composite coating process with electroslag surfacing using a current-supplying solidification mould was developed. The structure and properties of coatings from flux-cored wire deposited alloys with refractory micro-particles of titanium diboride, TiB₂, and nano-sized particles of titanium carbonitride, TiCN, were studied. Special features of the elasto-plastic deformation of composite alloys’constituents were studied with sclerometry.

Abstract: Presented in this article are the properties of flame sprayed ceramic coatings using oxide ceramic materials consisting of a powdered zirconium oxide (ZrO₂) matrix with 30% calcium oxide (CaO) applied to unalloyed S235JR grade structural steel. A primer consisting of a metallic Ni-Al-Mo based powder has been applied to plates with dimensions of 5x200x300 mm and front surfaces of ø 40x50 mm cylinders. Flame spraying of primer coating was conducted using a RotoTec 80 torch, and an external surface was coated with a CastoDyn DS 8000 torch. Evaluation of the coating properties was conducted using metallographic testing, phase composition research, measurement of microhardness, abrasive wear resistance (acc. to ASTM G65 standard) and erosion wear resistance (acc. to ASTM G76-95 standard).

Abstract: The abrasive wear of pure UHMWPE as well as one filled with nanoand microparticles (fibers) were investigated. It was found that abrasive wear resistance of microcomposites (containing AlO(OH) and Al₂O₃ microparticles) can grow up by 16-18 times in comparison with pure UHMWPE depending on the strength and size of the filler as well as abrasive grit. Nanofillers (AlO(OH) and carbon nanofibers (CNF) as well as SiO₂ and Cu nanoparticles) as opposed to microfillers can improve abrasive wear resistance of UHMWPE in a significantly less degree (up to 50 %). Abrasive wear resistance of nanocomposites weakly depends on the type of filler and is defined by the polymeric matrix (permolecular) and counter-face abrasive grit. The comparative analysis of the wear mechanisms of UHMWPE based micro-and nanocomposites under abrasive wear (fixed abrasive particles) and dry sliding friction is carried out.

Abstract: In most of the engineering applications, such as mining, agriculture, metallurgy, the equipments fail due to abrasive wear. Hardfacing is one of the most economical and most widely used methods of improving surface characteristics of engineering equipments (wear, corrosion) without changing the bulk properties of the components.Fe-Cr-C hardfacing alloys are well known for their excellent performances under severe wear conditions. The wear behaviour of hardfacing alloys depends on their chemical composition, on the microstructure obtained after welding, of the welding technology, respectively the welding parameters which strongly influence, for example, the dilution with the base material or formation of precipitated hard phases.The aim of this study was to characterize the microstructure of Fe-Cr-C hardfacing alloys and to investigate their abrasive wear behaviour. The research has been carried out using four types of Fe-Cr-C hardfacing alloys (8 12, 16 and 20 % Cr). The alloys were deposited on the low-carbon steel S355 JR by manual arc welding method. The abrasion wear testing was carried out using the Taber Rotary Abraser Equipment. The microstructure characterization and surface analysis were performed using optical microscopy and HV 10 hardness tests.

Abstract: The paper is focused on study of cladded layer properties created by laser beam, to abrasive wear resistant. As a basic material was used alloyed tool steel X37CrMoV5, the layers wascreated by laser beam by using a filler materials in the form of wire PZ 6159 and PZ 6168. The aim is research ofcladded layers structures changes, theirmicrohardness changes relative to the basic material and determine the abrasive wear resistance. One of the most important advantages of laser cladding technology is bringing the wire to the exact place of the interaction of a laser beam.

Abstract: This paper deals with the possibility of applying controlled diffusion processes in the remelting of steel surface layers using the electric arc of non-consumable electrode in the environment enriched with selected elements. The objective was to achieve an increased wear resistance. Boron was used in experiments as an alloying element. An assumption was stated in the experiment design that environment dissociation and ionisation can be achieved using electric arc, allowing diffusion processes initiation in the surface layer of remelted steel. Conditions for hard and stable structures formation with required properties should be achieved by surface layers enriching. Steel grade STN 41 5230 was used in experiments. Hardness and relative abrasive wear resistance values were measured on samples after remelting, being crucial as for required properties of surface layers. Not only hardness values were measured in the remelted layer but also their course inwards the material up to reaching the depth of base material not affected by heat. The metallographic analysis of remelted samples was made as well. A significant increase of parameters observed in the boron remelting environment was found. The dependency of the environment effect on the change of properties and boron content in the remelting environment was observed.

Abstract: The aim of this paper was the study of laser cladded layers applied in practice from the view of the internal structure of the material changes. In the process of cladding the laser beam was used as the heat source to melt and fuse the cladding alloy LS 30 onto the substrate - steel EN 1.2379.The filler material - wire diameter was 0.4 mm and the maximum height of the coating was 0.3 mm. The basic material was in minimal heat treated, in a very narrow intermediate layer with the character of diffusion joint. The cladded layers were evaluated for resistance to abrasive wear and topography of layers was performed. The proposed technology and the filler material have impact on the topography and roughness of the resulting layers.

Abstract: WC-10Co-4Cr cermet coatings were deposited on Inconel 718 alloy using the HVOF technique, then were heat treated by isothermal treatment (500°C, 3hours). The influences of isothermal heat treatment on micro-hardness, fracture toughness and abrasive wear resistance of WC coating were studied in this paper. The results show that the micro-hardness and fracture toughness of WC coating decrease after isothermal heat treatment, then the metallic blinder breaks up and the tungsten carbide particles pull out during abrasive wear test. Finally, it was concluded that the abrasive wear resistance of WC-10Co-4Cr coating decreased after isothermal heat treatment (500°C, 3hours).