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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effect of Chemical Composition on Structure and Corrosion Resistance of Ni-Mn-Cu Cast Iron
    Autorzy:
    Medyński, D.
    Janus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383110.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    corrosion
    martensitic transformation
    austenitic cast iron
    Ni-Mn-Cu cast iron
    nickel equivalent
    korozja
    przemiana martenzytyczna
    żeliwo austenityczne
    żeliwo Ni-Mn-Cu
    Opis:
    In the paper, a relationship between chemical composition of Ni-Mn-Cu cast iron and its structure, hardness and corrosion resistance is determined. The examinations showed a decrease of thermodynamic stability of austenite together with decreasing nickel equivalent value, in cast iron solidifying according to both the stable and the metastable systems. As a result of increasing degree of austenite transformation, the created martensite caused a significant hardness increase, accompanied by small decline of corrosion resistance. It was found at the same time that solidification way of the alloy and its matrix structure affect corrosion resistance to a much smaller extent than the nickel equivalent value, in particular concentration of elements with high electrochemical potential.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 59-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cr, Mo and Al on Structure and Selected Mechanical Properties of Austenitic Cast Iron
    Autorzy:
    Medyński, D.
    Janus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383202.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    austenitic cast iron
    austenite transformation
    heat treatment
    cast
    mechanical properties of cast
    nickel equivalent
    żeliwo austenityczne
    zmiana właściwości
    obróbka cieplna
    odlew
    właściwości mechaniczne odlewu
    Opis:
    Results of a research on influence of chromium, molybdenum and aluminium on structure and selected mechanical properties of Ni-Mn- Cu cast iron in the as-cast and heat-treated conditions are presented. All raw castings showed austenitic matrix with relatively low hardness, making the material machinable. Additions of chromium and molybdenum resulted in higher inclination to hard spots. However, a small addition of aluminium slightly limited this tendency. Heat treatment consisting in soaking the castings at 500 °C for 4 h resulted in partial transformation of austenite to acicular, carbon-supersaturated ferrite, similar to the bainitic ferrite. A degree of this transformation depended not only on the nickel equivalent value (its lower value resulted in higher transformation degree), but also on concentrations of Cr and Mo (transformation degree increased with increasing total concentration of both elements). The castings with the highest hard spots degree showed the highest hardness, while hardness increase, caused by heat treatment, was the largest in the castings with the highest austenite transformation degree. Addition of Cr and Mo resulted in lower thermodynamic stability of austenite, so it appeared a favourable solution. For this reason, the castings containing the highest total amount of Cr and Mo with an addition of 0.4% Al (to reduce hard spots tendency) showed the highest tensile strength.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 39-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Abrasive-wear Resistance of Austenitic Cast Iron
    Autorzy:
    Medyński, D.
    Janus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380382.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    abrasive wear
    austenitic cast iron
    heat treatment
    nickel equivalent
    transformation of austenite
    zużycie ścierne
    żeliwo austenityczne
    obróbka cieplna
    nikiel
    transformacja austenitu
    Opis:
    A research of wear resistance of an austenitic cast iron with higher resistance to abrasive-wear and maintained corrosion resistance characteristic for Ni-Resist cast iron is presented. For the examination, structure of raw castings was first formed by proper selection of chemical composition (to make machining possible). Next, a heat treatment was applied (annealing at 550 °C for 4 hours followed by air cooling) in order to increase abrasive-wear resistance. One of the factors deciding intensity of wear appeared to be the chilling degree of castings. However, with respect to unfavourable influence of chilling on machining properties, an important factor increasing abrasive-wear resistance is transformation of austenite to acicular ferrite as a result of annealing non-chilled castings. Heat treatment of non-chilled austenitic cast iron (EquNi > 16%) resulted in much higher abrasive-wear resistance in comparison to the alloy having pearlitic matrix at ambient temperature (EquNi 5.4÷6.8%).
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 43-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Austenite Transformation on Abrasive Wear and Corrosion Resistance of Spheroidal Ni-Mn-Cu Cast Iron
    Autorzy:
    Medyński, D.
    Janus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381837.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    abrasive wear
    corrosion resistance
    austenitic cast iron
    Ni-Mn-Cu cast iron
    martensitic transformation
    odporność na korozję
    żeliwo austenityczne
    żeliwo Ni-Mn-Cu
    przemiana martenzytyczna
    Opis:
    Within the presented work, the effect of austenite transformation on abrasive wear as well as on rate and nature of corrosive destruction of spheroidal Ni-Mn-Cu cast iron was determined. Cast iron contained: 3.1÷3.4 %C, 2.1÷2.3 %Si, 2.3÷3.3 %Mn, 2.3÷2.5 %Cu and 4.8÷9.3 %Ni. At a higher degree of austenite transformation in the alloys with nickel equivalent below 16.0%, abrasive wear resistance was significantly higher. Examinations of the corrosion resistance were carried out with the use of gravimetric and potentiodynamic method. It was shown that higher degree of austenite transformation results in significantly higher abrasive wear resistance and slightly higher corrosion rate, as determined by the gravimetric method. However, results of potentiodynamic examinations showed creation of a smaller number of deep pinholes, which is a favourable phenomenon from the viewpoint of corrosion resistance.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 63-66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dilatometric Research of High-quality Nodular Cast Iron
    Autorzy:
    Medyński, D.
    Janus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380654.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloy cast iron
    austenitic cast iron
    dilatometric research
    martensitic transformation
    nickel equivalent
    żeliwo stopowe
    żeliwo austenityczne
    badania dylatometryczne
    przemiana martenzytyczna
    ekwiwalent niklowy
    Opis:
    In the research, relationships between matrix structure and hardness of high-quality Ni-Mn-Cu cast iron containing nodular graphite and nickel equivalent value were determined. Nickel equivalent values were dependent on chemical composition and differences between them resulted mostly from nickel concentration in individual alloys. Chemical compositions of the alloys were selected to obtain, in raw condition, austenitic and austenitic-martensitic cast iron. Next, stability of matrix of raw castings was determined by dilatometric tests. The results made it possible to determine influence of nickel equivalent on martensite transformation start and finish temperatures.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 163-168
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Annealing on Nature of Corrosion Damages of Medium-nickel Austenitic Cast Iron
    Autorzy:
    Medyński, D.
    Janus, A.
    Chęcmanowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/383057.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    austenitic cast iron
    corrosion resistance
    stability of austenite
    obróbka cieplna
    żeliwo austenityczne
    odporność na korozję
    Opis:
    Within the presented research, effect of annealing on nature of corrosion damages of medium-nickel austenitic nodular cast iron castings, containing 5.5% to 10.3% Ni, was determined. Concentration of nickel, lower than in the Ni-Resist cast iron, was compensated with additions of other austenite-stabilising elements (manganese and copper). In consequence, raw castings with austenitic matrix structure and gravimetrically measured corrosion resistance increasing along with nickel equivalent value EquNi were obtained. Annealing of raw castings, aimed at obtaining nearly equilibrium structures, led to partial austenite-to-martensite transformation in the alloys with EquNi value of ca. 16%. However, corrosion resistance of the annealed alloys did not decrease in comparison to raw castings. Annealing of castings with EquNi value above 18% did not cause any structural changes, but resulted in higher corrosion resistance demonstrated by smaller depth of corrosion pits.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 85-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Heat-treatment Parameters of Cast Iron GJS-X350NiMnCu7-3-2 on its Structure and Mechanical Properties
    Autorzy:
    Medyński, D.
    Janus, A.
    Zaborski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/381991.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    właściwości mechaniczne
    obróbka cieplna
    transformacja austenityczna
    żeliwo austenityczne
    żeliwo Ni-Mn-Cu
    mechanical properties
    heat treatment
    austenitic transformation
    austenitic cast iron
    cast iron Ni-Mn-Cu
    Opis:
    The paper presents influence of soaking parameters (temperature and time) on structure and mechanical properties of spheroidal graphite nickel-manganese-copper cast iron, containing: 7.2% Ni, 2.6% Mn and 2.4% Cu. Raw castings showed austenitic structure and relatively low hardness (150 HBW) guaranteeing their good machinability. Heat treatment consisted in soaking the castings within 400 to 600°C for 2 to 10 hours followed by air-cooling. In most cases, soaking caused changes in structure and, in consequence, an increase of hardness in comparison to raw castings. The highest hardness and tensile strength was obtained after soaking at 550°C for 6 hours. At the same time, decrease of the parameters related to plasticity of cast iron (elongation and impact strength) was observed. This resulted from the fact that, in these conditions, the largest fraction of fine-acicular ferrite with relatively high hardness (490 HV0.1) was created in the matrix. At lower temperatures and after shorter soaking times, hardness and tensile strength were lower because of smaller degree of austenite transformation. At higher temperatures and after longer soaking times, fine-dispersive ferrite was produced. That resulted in slightly lower material hardness.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 121-126
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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