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    Wyświetlanie 1-3 z 3
    Tytuł:
    Selection of Casting Materials for Working Parts of Machines for the Forestry Sector
    Autorzy:
    Pirowski, Zenon
    Bitka, Adam
    Grudzień-Rakoczy, Małgorzata
    Małysza, Marcin
    Pysz, Stanisław
    Wieliczko, Piotr
    Wilk-Kołodziejczyk, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/2106604.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mulching
    forestry tools
    tribological wear
    abrasion-resistant cast steel
    hardfacing surface
    Opis:
    The article was created as a result of the work TECHMATSTRATEG 1 program “Modern Material Technologies” as part of the project with the acronym INNOBIOLAS entitled “Development of innovative working elements of machines in the forestry sector and biomass processing based on high-energy surface modification technologies of the surface layer of cast elements”; agreement No. TECHMATSTRATEG1/348072/2/NCBR/2017. The article discusses the procedure for selecting casting materials that can meet the high operational requirements of working tools of mulching machines: transfer of high static and dynamic loads, resistance to tribological wear, corrosion resistance in various environments. The mulching process was briefly described, then the alloys were selected for experimental tests, model alloys were made and perform material tests were carried out in terms of functional and technological properties. The obtained results allowed to select the alloy where the test castings were made.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 743--752
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Initial Analysis of the Surface Layer of AVGI Cast Iron Subject to Abrasion
    Autorzy:
    Jakubus, Aneta
    Powiązania:
    https://bibliotekanauki.pl/articles/2127510.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vermicular cast iron
    abrasion resistance
    austempering
    abrasion of cast iron
    surface layer
    AVGI
    żeliwo wermikularne
    odporność na ścieranie
    hartowanie
    ścieralność
    warstwa wierzchnia
    Opis:
    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.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 2; 50--56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Abrasive Wear of Fine-grained Ni3Al Intermetallic Alloys
    Autorzy:
    Zasada, D.
    Jasionowski, R.
    Bałdyga, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381521.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    abrasion
    wear
    intermetallic
    geometric structure of surface
    abrazja
    zużycie
    faza międzymetaliczna
    struktura geometryczna powierzchni
    Opis:
    Influence of chemical composition and material structure on the abrasive wear of Ni3Al intermetallic alloy in loose abrasive was investigated in details. Boron, zirconium and chromium were used as the alloying elements. The alloys are made up of &gamma' or &gamma'+&gamma phases (single-phase, ordered matrix + disordered area). Grain size of the alloys was varied: 5, 20 and 45 &mi m. Abrasive were experiments were performed with T-07 tester (Norma company) in accordance to the GOST 23.2008-79 standard. Mechanism of surface layer damaging exposed to the loose abrasive was described on the basis of the obtained structural and topographical experiments. The results revealed that relative abrasive wear in loose abrasive is approximately same for all the investigated alloys with varied grain size.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 187-192
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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