Wyniki wyszukiwania - BazTech

1

Effects of Rare-Earth Metal Oxides on the Tribological Properties of Paddings for use on Mining Machine Parts

Kasińska Justyna, Madej Monika, Rutkowski Sławomir

Tribologia

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2022

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nr 2

23--32

EN

The article presents the results of research on pad welds made using consumables in the process of metal active gas welding (MAG) combined with plasma arc welding (PAW). The pad weld consisted of a buffer layer and a wear-resistant working layer. Cerium, yttrium and lanthanum oxides were added to the powders to modify the working (active) layer. The HV10 hardness and friction coefficient testing was followed by measuring wear tracks and determining wear indicators (maximum wear track depth and area). Yttrium oxide was found to have a remarkably beneficial effect on nickel-based pad welds. In the case of iron-based welds, the most favourable outcome was observed for lanthanum oxide.

PL

W artykule przedstawiono wyniki badań napoin wykonanych z wykorzystaniem materiałów spawalniczych metodą spawania łukowego elektrodą topliwą (MAG – metal active gas of welding) w połączeniu z napawaniem plazmowym (PAW – pasma arc welding). Napoina składała się z warstwy podkładowej (buforowej) oraz trudnościeralnej warstwy roboczej. Warstwę roboczą modyfikowano poprzez wprowadzanie do proszków tlenków ceru, itru i lantanu. Wykonane napoiny poddano pomiarom twardości HV10 oraz przeprowadzono testy tribologiczne, w których wyznaczono współczynnik tarcia. Następnie dokonano pomiarów śladów zużycia i zostały określone wskaźniki zużycia (maksymalna głębokość wytarcia, pole wytarcia). Wykazano korzystne oddziaływanie w szczególności tlenku itru dla napoin na osnowie niklu. W przypadku napoiny na osnowie żelaza najkorzystniejsze oddziaływanie odnotowano dla tlenku lantanu.

2

Initial Analysis of the Surface Layer of AVGI Cast Iron Subject to Abrasion

Jakubus Aneta

Archives of Foundry Engineering

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2022

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Vol. 22, iss. 2

50--56

EN

The article presents the results of research on the abrasion resistance of cast iron with vermicular graphite in the as-cast state and after austempering (the latter material is referred to as AVGI – Austempered Vermicular Graphite Iron). Austenitization was carried out at the temperature values of either 900°C or 960°C, and austempering at the temperature values of either 290°C and or 390°C. Both the austenitization and the austempering time was equal to 90 minutes. The change of the pearlitic-ferritic matrix to the ausferritic one resulted in an increase in mechanical properties. Abrasion tests were conducted by means of the T-01M pin-on-disc tribometer. The counter-sample (i.e. the disc) was made of the JT6500 friction material. Each sample was subject to abrasion over a sliding distance of 4000 m. The weight losses of both samples and counter-samples were determined by the gravimetric method. It was found that the vermicular cast iron austenitized at 900°C and austempered at 290°C was characterized by the lowest wear among the evaluated cast iron types. The geometric structure of the surface layer after the dry friction test exhibited irregular noticeable grooves, distinct oriented abrasion traces, plastic flow of the material, microcracks, and pits generated by tearing out the abraded material. The largest surface roughness was found for the AVGI cast iron heat-treated according to the variant 3 (Tγ =900 ºC; Tpi = 390°C), while the smallest one occurred in AVGI cast iron subject to either the variant 2 (Tγ =960 ºC; Tpi = 290°C) or the variant 4 (Tγ =900 ºC; Tpi = 290°C) of heat treatment and was equal to either 2.5 μm or 2.66 μm, respectively. It can be seen that the surface roughness decreases with the decrease in the austempering temperature.

3

The effects of Nano SiO2 and Silica Fume on the properties of concrete

Tran Huu-Bang, Phan Vu To-Anh

Archives of Civil Engineering

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2022

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Vol. 68, nr 2

391-407

EN

This study investigates the effects of Nano SiO2 (NS) and Silica fume (SF) on the mechanical properties and durability of Portland cement concrete. On specimens with varying NS and SF concentrations, compressive strength, flexural strength, abrasion resistance, elastic modulus, and chloride ion penetration were all tested. All specimens were subjected to the proposed method/technique cured at the ages of 3, 7, 28, and 60 days. NS particles were added to cement concrete at various replacements of 0, 0.5, 1.0, 1.5, and 2.0% by the mass of the binder. The water/binder ratio has remained at 0.37 for all mixes. Then, for cement-concrete were prepared 45 MPa (C45) with NS and SF. The specimens confirm the new method effectiveness evaluation were prepared under two different categories: (1) Portland cement replacement with NS of 0%, 0.5%, 1.0%, 1.5%, and 2.0%, by weight for adhesives; (2) Portland cement replacement with NS of 0.5%, 1.0% and each NS content in combination with SF of 5%, 10%, and 15%, respectively, by weight for adhesives. The results indicated that the abrasion resistance and Chloride ion penetration of concrete containing NS and SF are improved. Finally, an analytical model for forecasting the Elastic modulus, flexural strength, and compressive strength of cement concrete was established from obtained data.

4

Ścieralność betonowych posadzek przemysłowych w technologii DST

Słonina Sławomir

Nowoczesne Hale

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2021

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Nr 1

42--47

PL

W artykule przedstawiono najistotniejsze informacje zawarte w aktualnej literaturze technicznej dotyczące ścieralności betonowych posadzek przemysłowych wykonywanych w technologii DST.

EN

The paper presents the most important information featured in the current technical literature about the abrasion resistance of concrete industrial DST floors.

5

Performance Evaluation of Upholstery Fabric Developed from Recycled Fibres

Jamshaid Hafsa, Zahid Bilal, Rajput Abdul Waqar, Hussain Sajid, Hussain Uzair

Fibres & Textiles in Eastern Europe

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2021

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Vol. 29, no. 5 (149)

46--49

EN

The aim of this work was to investigate the properties of upholstery fabric produced from recycled hard waste of coloured fabric clippings. Mélange yarns were formed with the combination of red, green, black and yellow in different ratios. Five yarn samples of 5 Nec linear density were produced from each blend ratio using the rotor spinning technique. These yarns were used to develop fabric samples in a satin weave. These yarn and fabric samples were investigated for different quality parameters, especially the abrasion resistance, pilling resistance, absorbency and light fastness of the fabrics as per standard test methods. The abrasion test is important for the durability and longer-lasting performance of upholstery fabric. From the analysis of test results, it is concluded that all the serviceability properties are in a good range, and these fabrics can be used for waiting room area upholstery fabric.

PL

Celem pracy było zbadanie właściwości tkanin obiciowych wytworzonych z recyklingu odpadów kolorowych ścinków tkanin. Przędze melanżowe powstały z połączenia czerwonego, zielonego, czarnego i żółtego koloru w różnych proporcjach. Wytworzono pięć próbek przędzy z każdego stosunku mieszanki przy użyciu techniki przędzenia rotorowego. Przędze zostały wykorzystane do opracowania próbek tkanin. Następnie próbki przędzy i tkanin zbadano pod kątem różnych parametrów jakościowych, w szczególności odporności na ścieranie, odporności na pilling, chłonności i odporności na światło tkanin zgodnie ze standardowymi metodami badawczymi. Test ścieralności jest ważny z punktu widzenia trwałości tkaniny obiciowej. Z analizy wyników badań wynikało, że wszystkie właściwości użytkowe mieszczą się w dobrym zakresie, a tkaniny te mogą być stosowane jako tkaniny obiciowe.

6

Characteristics of Laminates for Car Seats

Batič Eva, Šajn Gorjanc Dunja

Autex Research Journal

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2021

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Vol. 21, no. 4

379--392

EN

In the presented research, 11 different laminates were compared, 8 of them were two-layered 3 of them were three-layered laminates. The laminates that were analyzed vary by the type of face-side textile material (knitted and nonwoven textiles), density and thickness of the foam, and specific properties (higher air permeability and low-emission foam). Depending on the different types of laminates, different laminating processes are used: hot-melt, flame, and powder laminations. The purpose of the presented research is to analyze the basic characteristics of the different laminate structures. Properties that are important for these types of laminates are the number of layers, areal density, thickness, resistance to rubbing, fire resistance, water vapor permeability, air permeability, breaking force and extension, thermal conductivity, and stratification. We found that the properties of laminates were not affected by the density and thickness of the foam. Nonwovens and other laminate components do not perform because they have lower abrasion resistance and lower tensile strength than knitted fabrics as the face layer. Knit laminates have good abrasion resistance, high air permeability, and water vapor permeability. Both are self-extinguishing to the first or second mark. Three-layered laminates have lower thermal conductivity and air permeability than two-layered laminates.

7

Wybrane zagadnienia projektowania, wykonawstwa oraz użytkowania betonowych posadzek przemysłowych w aspekcie ich ścieralności

Świątek-Żołyńska Sylwia, Majewski Tomasz, Niedostatkiewicz Maciej

Przegląd Budowlany

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2020

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R. 91, nr 6

36--43

PL

Posadzki są elementem, którego stan techniczny wpływa zarówno na bezpieczeństwo użytkowania, jak również na komfort eksploatacyjny obiektu budowlanego. Jednym z najbardziej popularnych rozwiązań w zakresie betonowych posadzek przemysłowych są posadzki z impregnacją górnej powierzchni z zastosowaniem suchej posypki nawierzchniowej (DST – z ang. Dry Shake Topping). W następstwie błędów i niedociągnięć zarówno projektowych, jak i wykonawczych oraz niewłaściwej eksploatacji posadzki betonowe mogą ulegać przyśpieszonej dekapitalizacji. W artykule opisano najczęściej popełniane błędy przyczyniające się do nadmiernej ścieralności betonowych posadzek przemysłowych, których górna powierzchnia została zabezpieczona suchą posypką nawierzchniową oraz podano sposób ich usuwania. Przedmiot artykułu stanowi również dyskusja na temat współczesnych metod diagnostyki betonowych posadzek przemysłowych w zakresie oceny ich ścieralności.

EN

Floors are an element whose technical condition affects both the safety of use and the operational comfort of a building. One of the most popular solutions in the field of concrete industrial floors are floors with impregnation of the upper surface using dry topping (DST – Dry Shake Topping). As a result of errors and shortcomings in both design and execution, as well as improper operation, concrete floors may undergo accelerated decapitalization. The paper describes the most common mistakes contributing to excessive abrasion of industrial concrete floors whose upper surface has been secured with dry topping and a method of removing them. The subject of the paper is also a discussion on contemporary methods of diagnostics of concrete industrial floors in the scope of assessing their abrasion.

8

Thermal analysis of matrix composite reinforced with Al2O3 particles

Włodarczyk-Fligier A., Polok-Rubiniec M., Konieczny J.

Journal of Achievements in Materials and Manufacturing Engineering

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2020

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Vol. 100, nr 1

5--11

EN

Purpose: The aim of this paper is to present a modern manufacturing method of production and compare the thermal, mechanical, properties of composite materials with aluminium alloy matrix reinforced by Al2O3 particles. Design/methodology/approach: The material for investigation was manufactured by the method of powder metallurgy (consolidation, pressing, hot concurrent extrusion of powder mixtures of aluminium EN AW-AlCu4Mg1 (A) and ceramic particles Al2O3). The amount of the added powder was in the range of 5 mass.%, 10 mass.% and 15 mass.%. Findings: The received results concerning the enhancement of hardness, which show the possibility of obtaining the MMC composite materials with required microstructure, influencing the properties of the new elaborated composite materials components. Concerning the thermal properties, especially the linear thermal expansion coefficient was measured, as well as the dilatometric change of the sample length was analysed. Practical implications: Concerning practical implications it can be stated that the tested composite materials can be applied among others in the transportation industry, but it requires additional research. Originality/value: The received results show the possibility of obtaining new composite materials with controlled and required microstructure with possible practical implications.

9

Mikrostruktura i wybrane własności materiału zastosowanego na dyfuzor silnika samolotu odrzutowego

Dąbrowski Robert, Baran Krzysztof

Hutnik, Wiadomości Hutnicze

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2020

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Vol. 87, nr 7-8

188--195

PL

W artykule zaprezentowano wyniki badań mikrostruktury, wybranych własności mechanicznych (twardość, odporność na pękanie w warunkach dynamicznych), użytkowych (odporność na ścieranie) i fizycznych (współczynnik rozszerzalności liniowej) próbek pobranych z dyfuzora kompresora silnika samolotu, wykonanego ze stali martenzytycznej odpornej na korozję. Postawowe wskaźniki własności mechanicznych stali, z której wykonano dyfuzor kompresora wynoszą: HRC = 48, KV = 15,7 J (dla przekroju 0,4 cm2), współczynnik tarcia w zakresie 0,38 ÷ 0,57 (zależnie od czasu trwania próby), średni współczynnik rozszerzalności liniowej 14,7 ∙ 10-6 K-1 (dla zakresu przed przemianą fazową) i 22,8 ∙ 10-6 K-1 (dla zakresu po przemianie). Mikrostrukturę elementu dyfuzora w stanie obrobionym cieplnie stanowi martenzyt odpuszczony. Obserwacje fraktograficzne wskazują na mieszany charakter przełomów próbek dyfuzora użytych do badań odporności na pękanie, tj. charakter quasi - kuchy z przewagą przełomu transkrystalicznego i pewnym udziałem przełomu międzykrystalicznego.

EN

The results of microstructural studies, mechanical examinations (hardness, impact toughness), utility (resistance to wear) as well as physical (coefficient of linear thermal expansion) properties of samples taken from jet engine diffuser are presented in this paper. The diffuser was made of martensitic corrosion resistant steel. The steel is characterised by the following mechanical and physical parameters: HRC = 48, KV = 15.7 J (for cross-section of 0.4 cm2), friction coefficient 0.38 - 0.57 (depending of a test duration), average coefficient of linear thermal expansion 14.7 · 10-6 K-1and 22.8 · 10-6 K-1 for temperatures below and above phase transformation, respectively. The microstructure of the heat treated part consists of a tempered martensite. Fractographic studies has proved that a fracture of the specimen has a mixed, quasi-brittle character where transcrystalline fracture dominates over intercrystalline one.

10

Research on Footwear Laces with Respect to Abrasion Resistance and Spontaneous Untying

Czaplicki Zdzisław, Rylski Adam, Serweta Wioleta, Strzelecki Stanisław

Fibres & Textiles in Eastern Europe

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2020

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Vol. 28, no. 3 (141)

23--26

EN

In this paper, two types of footwear laces research were undertaken. The first was connected with abrasion resistance and the second with the displacement force at the knot. The abrasion resistance was registered by the level of abrasion for standard eyelet. The displacement force was measured with the use of a tensile test machine, where the force and extension were registered. As a criterion of test evaluation, the maximum force was established when the knot was untied. The research was conducted for a set of different types of shoelaces (differing in shape, structure and raw materials). The evaluation criteria proposed can be used in order to determine the raw materials and optimal construction of shoelaces. From the user’s point of view, the measures identified i. e. the displacement force in the knot (Fpw) and abrasion resistance (Ks) are the most important factors.

PL

W pracy przedstawiono dwie metody badań sznurowadeł obuwniczych, dotyczące odporności na ścieranie i siły przesuwu w węźle. Odporność na ścieranie badano na specjalnie wykonanym stanowisku, w którym elementem ścierającym było standardowe oczko obuwnicze. Badania siły przesuwu sznurowadła w węźle wykonywano na zrywarce wyposażonej w urządzenie rejestrujące siłę i wydłużenie. Jako kryterium oceny przyjęto maksymalną siłę, przy której nastąpiło rozwiązanie węzła sznurowadła. Materiał badań stanowiły sznurowadła obuwnicze różniące się kształtem (strukturą) wykonane z różnych surowców. Zaproponowane kryteria oceny pozwalają na optymalne dobranie surowców i konstrukcji sznurowadeł obuwniczych. Wyznaczane wskaźniki tj. siła przesuwu sznurowadła w węźle (Fpw) i współczynnik odporności na ścieranie (Ks) stanowią najbardziej istotne wskaźniki z punktu widzenia użytkownika.

11

The Effect of Sintering Time on Wear Resistance of Silicon Nitride

Gábrišová Zuzana, Brusilová Alena, Švec Pavol

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 2

145--154

EN

The effect of sintering time on the chosen mechanical and tribological properties of silicon nitride (Si3N4) with 5 wt.% of yttrium aluminium garnet (Y3Al5O12) ceramics was investigated. The Si3N4 ceramics sintered for shorter time contained a larger portion of untransformed a-Si3N4 phase which has higher hardness compared to the tougher β-Si3N4 phase. The fracture toughness of Si3N4 ceramics increased with the prolongation of its sintering time. The microcutting wear mechanisms predominated during the grinding of the Si3N4 ceramics with the Al2O3 abrasives. The hardness of ceramic material had a great effect on its wear resistance. The wear of ceramics at friction with 18Cr-8Ni type of austenitic stainless steels was several times higher compared to friction with 14Cr type of ferritic stainless steel. Under these conditions, the microcracking wear mechanisms predominated.

12

Properties of flame-powder sprayed aluminum coatings reinforced with particles of carbonaceous materials

Czupryński Artur

Welding Technology Review

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2019

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R. 91, nr 4

17--30

EN

The article presents the results of research on tribological properties of aluminum coatings, reinforced with particles of carbon nanotubes Nanocyl NC 7000 in quantities of 0.5 wt.% and 1 wt.% as well as carburite (elemental carbon) in an amount of 0.5 wt.%, flame-powder sprayed on a non-alloy structural steel grade S235J0 according to EN 10027-1. The coating properties were assessed based on macro and microscopic metallographic examinations, chemical composition tests, microhardness measurements and abrasion and erosive wear resistance tests. The obtained results were compared with the results obtained for samples with coatings made of aluminum powder - EN AW 1000 series.

PL

W artykule przedstawiono wyniki badań dotyczących właściwości tribologicznych powłok aluminiowych, wzmacnianych cząstkami materiałów węglowych w postaci nanorurek Nanocyl NC 7000 w ilości 0,5% wag. i 1% wag. oraz karburytu (węgla pierwiastkowego) w ilości 0,5% wag., natryskiwanych płomieniowo proszkowo (PFS) na podłoże z niestopowej stali konstrukcyjnej gatunku S235JO wg EN 10027-1. Oceny właściwości powłok dokonano w oparciu o badania metalograficzne makro- i mikroskopowe, badania składu chemicznego, pomiar twardości oraz badania odporności na zużycie ścierne i erozyjne. Otrzymane wyniki porównano z wynikami otrzymanymi dla próbek z powłokami wykonanymi proszkiem aluminium seria EN AW 1000.

13

Opracowanie nowej gamy płytek o wysokiej odporności na ścieranie z wykorzystaniem innowacyjnego systemu barwienia masy

Poddębniak Anna

Szkło i Ceramika

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2019

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R. 70, nr 1

32--34

14

Zastosowanie elektrokorundu do wytwarzania warstw kompozytowych w odlewach żeliwnych

Dulska Agnieszka, Kilarski Jerzy, Studnicki Andrzej, Szajnar Jan

Stal, Metale & Nowe Technologie

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2019

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nr 11-12

61--68

PL

W artykule przedstawiono wybrane i dostępne na krajowym rynku ziarniste materiały ceramiczne, wyznaczono ich charakterystyczne cechy oraz przeprowadzono próby infiltracji (przesiąkania) w aspekcie zastosowania na warstwy kompozytowe w odlewach. Całość zakończono wykonaniem próbnych odlewów i uwagami z badań eksploatacyjnych.

15

Badania materiałów spodowych obuwia dla osób powyżej 60 lat

Czaplicki Zdzisław, Olejniczak Zbigniew, Serweta Wioleta

Przegląd Włókienniczy - Włókno, Odzież, Skóra

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2019

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nr 5

30--32

PL

W artykule przedstawiono analizę porównawczą materiałów spodowych, z jakich wykonywane są spody obuwia dla osób 60+. Przy wyborze tych materiałów uwzględniono ich dostępność na rynku oraz wykorzystywanie przez producentów obuwia. Badano pięć różnych materiałów podeszwowych wykonanych na bazie polichlorku winylu, kauczuku termoplastycznego i poliuretanu. W badanych próbkach określono m. in. takie parametry jak odporność na ścieranie, twardość, elastyczność, absorpcję energii i współczynnik tarcia (odporność na poślizg). Stwierdzono, że najlepsze wyniki uzyskały próbki wykonane na bazie polichlorku winylu.

EN

This paper presents the comparative analysis of the sole materials for the shoes sole used by the persons over 60th+. The choice of materials was considered their accesability on the market and application by the shoes manufactures. Five different sole materials manufactured on the basis of polyvinyl chloride (PVC), thermoplastic rubber and polyurethane were investigated. During the investigations the following parameters were determined: resistance to abrasion, hardness, elasticity, energy absorption and friction coefficient (resistance for slide). It was stated that the best results were obtained the specimens produced on the basis of polyurethane.

16

Role of materials design in maintenance engineering in the context of industry 4.0 idea

Dobrzański L. A.

Journal of Achievements in Materials and Manufacturing Engineering

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2019

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Vol. 96, nr 1

12--49

EN

Purpose: The paper presents the issues of designing the maintenance of materials and products in accordance with the idea of Industry 4.0. The author's views on the need for augmentation of the Industry 4.0 model were also presented, as well as the author's original concept that hybrid activities in predictive maintenance and condition-based maintenance should be preceded by designing material, maintenance & manufacturing 3MD at the stage of the product's material designing and technological designing. The 3MD approach significantly reduces the frequency of assumed actions, procedures and resources necessary to remain the condition of this product for the longest possible time, enabling it to perform the designed working functions. Examples of own advanced research on several selected, newly developed materials, used in very different areas of application, confirmed the validity of the scientific hypothesis and the relationship between the studied phenomena and structural effects and the working functions of products and their maintenance and indicated that material design is one of the most important elements guaranteeing progress production at the stage of Industry 4.0 of the industrial revolution. Design/methodology/approach: The author's considerations are based on an extensive literature study and the results of the author's previous study and empirical work. Each of the examples given required the use of a full set of research methods available to modern material engineering, including HRTEM high-resolution transmission electron microscopy. Findings: The most interesting intellectual achievements contained in the paper include presentations of the author's original concepts regarding the augmentation of the Industry 4.0 model, which has been distributed so far, which not only requires augmentation but is actually only one of the 4 elements of the technology platform of the extended holistic model of current industrial development, concerning cyber-IT production aided system. The author also presents his own concept for designing material, maintenance and manufacturing 3MD already at the stage of material and technological design of the product, eliminating many problems related to product maintenance, even before they are manufactured and put into exploitation. Detailed results of detailed structural researches of several selected avant-garde engineering materials and discussion of structural changes that accompanying their manufacturing and/or processing are also included. Originality/value: The originality of the paper is associated with the novelty of the approach to analysing maintenance problems of materials and products, taking into account the requirements of the contemporary stage of Industry 4.0 development. The value of the paper is mainly associated with the presentation of original issues referred to as findings, including the concept of augmentation of the Industry 4.0 model and the introduction and experimental confirmation of the idea by designing material, maintenance and manufacturing 3MD.

17

The analysis of the abrasive and erosive wear resistance of abrasion-resistant sheets

Poloczek Tomasz, Czupryński Artur

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2019

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Vol. 63, No. 3

21--30

EN

The article presents results of tests concerning the assessment of the abrasive and erosive wear of abrasion-resistant plates fabricated by Polish and overseas manufacturers. Materials used in the tests, i.e. the Castolin CDP® 1001, CDP® 4666 and CeraMetal® HCCr plates were made using the automated arc welding technology. Reference materials used in the tests were both Polish and overseas abrasion-resistant plates. The analysis of the results of hardness tests performed in accordance with PN-EN ISO 6508-1:2016 as well as of the results of abrasive and erosive wear tests performed in accordance with ASTM G65-00 and ASTM G76-04 enabled the indication of materials characterised by the most favourable functional properties enabling operation under conditions of intense metal-mineral abrasive wear.

PL

Przedstawiono wyniki badań dotyczące oceny odporności na zużycie ścierne oraz erozyjne płyt trudnościeralnych wytwarzanych przez producentów krajowych i zagranicznych. Materiały użyte do badań w postaci płyt Castolin CDP® 1001, CDP® 4666, CeraMetal® HCCr wykonane zostały w technologii automatycznego napawania łukowego. Jako materiały referencyjne zastosowano blachy ze stali trudnościeralnych produkcji zagranicznej oraz produkcji polskiej. Analizując wyniki badań twardości wg normy PN-EN ISO 6508-1:2016 i odporności na zużycie ścierne oraz erozyjne prowadzone zgodnie z normą ASTM G65-00 i ASTM G76-04, wytypowano materiały o najlepszych parametrach użytkowych do zastosowań w warunkach silnego zużycia ściernego typu metal-minerał.

18

Flux-cored strips – the deposition and application range of abrasion-resistant layers

Woronczuk Aleksander P., Żudra Aleksander P.

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2019

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Vol. 63, No. 3

45--51

EN

The article presents the structure and chemical composition of fluxcored electrode strips used for the deposition of abrasion-resistant layers involving the use of non-submerged arc and flux, analyses technologies used during the surfacing involving the use of flux-cored strips as well as presents exemplary applications, related welding (surfacing) equipment and advantages resulting from the use of the above-named filler metals.

PL

Przedstawiono konstrukcję i skład chemiczny taśm elektrodowych proszkowych przeznaczonych do napawania warstw odpornych na ścieranie łukiem nieosłoniętym oraz pod topnikiem. Rozpatrzono specyfikę technologii napawania taśmami proszkowymi. Opisano przykłady zastosowania tego rodzaju napawania, urządzenia spawalnicze i zalety stosowania tych spawalniczych materiałów dodatkowych.

19

The Influence of the Shape of Graphite Precipitates on the Cast Iron Abrasion Resistance

Jakubus A., Soiński M. S.

Archives of Foundry Engineering

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2019

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iss. 4

87--90

EN

The paper presents the initial results of investigation concerning the abrasion resistance of cast iron with nodular, vermicular, or flake graphite. The nodular and vermicular cast iron specimens were cut out of test coupons of the IIb type with the wall thickness equal to 25 mm, while the specimens made of grey cast iron containing flake graphite were cut out either of special casts with 20 mm thick walls or of the original brake disk. The abrasion tests were carried out by means of the T-01M tribological unit working in the pin-on-disk configuration. The counterface specimens (i.e. the disks) were made of the JT6500 brand name friction material. Each specimen was abraded over a distance of 4000 m. The mass losses, both of the specimens and of the counterface disks, were determined by weighting. It was found that the least wear among the examined materials was exhibited by the nodular cast iron. In turn, the smallest abrasion resistance was found in vermicular cast iron and in cast iron containing flake graphite coming from the brake disk. However, while the three types of specimens (those taken from the nodular cast iron and from grey cast iron coming either from the special casts or from the brake disk) have almost purely pearlitic matrix (P95/Fe05), the vermicular cast iron matrix was composed of pearlite and ferrite occurring in the amounts of about 50% each (P50/Fe50). Additionally, it was found that the highest temperature at the cast iron/counterface disk contact point was reached during the tests held for the nodular cast iron, while the lowest one occurred for the case of specially cast grey iron.

20

Abrasion Resistance of S235, S355, C45, AISI 304 and Hardox 500 Steels with Usage of Garnet, Corundum and Carborundum Abrasives

Szala Mirosław, Szafran Michał, Macek Wojciech, Marchenko Stanislav, Hejwowski Tadeusz

Advances in Science and Technology. Research Journal

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2019

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Vol. 13, no 4

151--161

EN

The steel presents a wide field of application. The abrasive wear resistance of steel relies mainly on the microstructure, hardness as well as on the abrasive material properties. Moreover, the selection of a abrasion-resistant grade of steel still seems to be a crucial and unsolved problem, especially due to the fact that the actual operating conditions can be affected by the presence of different abrasive materials. The aim of this work was to determine the effect of different abrasive grit materials i.e. garnet, corundum and carborundum on the abrasive wear result of a commonly used in industry practice steels i.e. S235, S355, C45, AISI 304 and Hardox 500. The microstructure of the steel was investigated using light optical microscopy. Moreover, hardness was measured with Vickers hardness tester. Additionally, the size and morphology of the abrasive materials were characterized. The abrasion tests were conducted with the usage of T-07 tribotester (dry sand rubber wheel). The results demonstrate that the hardness and structure of steels and hardness of abrasive grids influenced the wear results. The abrasive wear behavior of steels was dominated by microscratching and microcutting wear mechanisms. The highest mass loss was obtained for garnet, corundum, and carborundum, respectively. The usage of various abrasives results in different abrasion resistance for each tested steel grade. The AISI 304 austenitic stainless steel presents an outstanding abrasive wear resistance while usage of corundum and Hardox 500 while using a garnet as abrasive material. The C45 carbon steel was less resistant than AISI 304 for all three examined abrasives. The lowest resistance to wear in garnet and carborundum was obtained for the S235JR and S355J2 ferritic-perlitic carbon steels and in corundum for Hardox 500 which has tempered martensitic structure.