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    Wyświetlanie 1-7 z 7
    Tytuł:
    Microstructure and abrasive wear resistance of 18Cr-4Ni-2.5Mo cast steel
    Autorzy:
    Kalandyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380296.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stal wysokostopowa Cr-Ni
    mikrostruktura
    wykres CTPc
    zużycie ścierne
    highly alloyed Cr-Ni cast steel
    microstructure
    equivalent Cr and Ni
    CCT diagrams
    abrasive wear
    Opis:
    An influence of a decreased Cr content on the microstructure of the highly alloyed Cr-Ni cast steel, duplex type, melted under laboratory conditions, was characterized in the paper. The microstructure investigations were performed in the initial state and after the heat treatment (solution annealing) at 1060 C as well as the phase transformation kinetics at continuous cooling was measured. The wear resistance of the investigated cast steel was tested and compared with the 24%Cr-5%Ni-2.5%Mo cast steel. The Cr content decrease, in ferritic-austenitic cast steels (duplex), from 24-26%Cr to 18% leads to the changes of the castings microstructure and eliminating of a brittle \sigma phase. In dependence of the casting cooling rate, apart from ferrite and austenite, also fine martensite precipitates occur in the casting structure. It was shown that the investigated cast steel is characterised by a slightly lower wear resistance than the typical cast steel duplex grades.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 81-84
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ żużli syntetycznych na proces odsiarczania niskostopowego staliwa Cr-Ni-Mo
    The Influence of Synthetic Slags on Desulphurisation Process of Low Alloy Cr-Ni-Mo Cast Steel
    Autorzy:
    Balicki, M.
    Sobula, S.
    Kalandyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380598.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    obróbka pozapiecowa stali
    żużel syntetyczny
    staliwo Cr-Ni-Mo
    secondary metallurgy
    synthetic slag
    Cr-Ni-Mo cast steel
    Opis:
    W artykule zaprezentowano wyniki obróbki pozapiecowej stali niskostopowej L70H2GNM przeznaczonej na masywne odlewy, pracujące w warunkach ścierania. Obróbka polegała na przedmuchiwaniu argonem stali w kadzi odlewniczej o pojemności 8,5 Mg, przy udziale trzech różnych żużli syntetycznych. Do badań wybrano żużle dostępne na rynku materiałów odlewniczych takie jak: LDSF LT firmy Kerneos, UZRA KP firmy ZM Ropczyce, który dodatkowo zmodyfikowano przez wprowadzenie aluminium. Czas przedmuchiwania kąpieli argonem wynosił 4 minuty dla każdego wytopu. Na podstawie przeprowadzonych badań uzyskano zmiany zawartości siarki w wytapianym staliwie w zależności od zastosowanych żużli syntetycznych. Stwierdzono, że zawartość siarki w staliwie zmniejszyła się po rafinacji w kadzi. Dodatkowo wykazano, że na zawartość siarki w badanym staliwie ma wpływ skład chemiczny zastosowanych żużli syntetycznych.
    In this article, the results of secondary metallurgy of L70H2GNM cast steel has been shown. This grade of low alloy cast steel is popular in Poland for heavy castings which works in wear conditions e.g. in coal mills. The ladle refining process was composed of argon stirring in 8.5 Mg bottom pour ladle and treatment with synthetic slags. The three commercial slag mixtures available on casting materials market such as: LDSF of the Kerneos company, UZRA KP and UZRA KP+Al of the ZM Ropczyce company were chosen for examinations. The time of argon blowing through porous plug was 4 minutes for every melt. Experimental results have shown, that sulphur content in steel decreases after refining in ladle. Moreover, desulphurisation ratio during argon stirring have also been influenced by composition of slag mixtures.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4 spec.; 11-14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stereological Analysis of Carbides in Hypoeutectic Chromium Cast Iron
    Autorzy:
    Gromczyk, M.
    Kondracki, M.
    Studnicki, A.
    Szajnar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380779.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stereological parameter
    Fe-C-Cr alloy
    chromium carbide
    chromium cast iron
    parametr stereologiczny
    stop Fe-C-Cr
    węglik chromu
    żeliwo chromowe
    Opis:
    The results of research on stereological parameters of carbides in modified hypoeutectic chromium cast iron were shown in the paper. The effect of distance the casting heat centre of casting to the carbide phase morphology was examined. The samples for metallographic examination were taken from various locations of the model casting prepared in a special tester. This model casting was designed to simulate the solidification of heavy castings. Using the proposed methodology the relation of the distance from the model mould and the size, perimeter, length, width and the shape factor of carbides was examined. During the analysis, the values of stereological parameters of carbides changed on various sections of the model casting.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 17-22
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Case-Based Reasoning System for the Selection of Silumin Alloying Elements
    Autorzy:
    Rojek, G.
    Regulski, K.
    Kluska-Nawarecka, S.
    Wilk-Kołodziejczyk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/382446.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    information technology
    silumin
    mechanical properties
    modified alloys
    additions Cr, Mo, V, W
    przemysł odlewniczy
    technologia informacyjna
    właściwości mechaniczne
    stopy modyfikowane
    dodatki Cr, Mo, V, W
    Opis:
    This work presents the project of the application of Case-based reasoning (CBR) methodology to an advisory system. This system should give an assistance by selection of proper alloying additives in order to obtain a material with predetermined mechanical properties. The considered material is silumin EN AC-46000 (hypoeutectic Al-Si alloy) that is modified by the addition of Cr, Mo, V and W elements in the range from 0% to 0.5% in the modified alloy. The projected system should indicate to the user the content of particular additives so that the obtained material is in the chosen range of parameters: tensile strength Rm, yield strength Rp0.2, elongation A and hardness HB. The CBR methodology solves new problems basing on the solutions of similar problems resolved in the past. The advantage of the CBR application is that the advisory system increases knowledge base as the subsequent use of the system. The presented design of the advisory system also considers issues related to the ergonomics of its operation.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 126-131
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cast steels for creep-resistant parts used in heat treatment plants
    Autorzy:
    Drotlew, A.
    Garbiak, M.
    Piekarski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380318.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    staliwo austenityczne Ni-Cr
    obróbka cieplna
    innovative foundry technologies
    innovative foundry materials
    cast Ni-Cr austenitic steel
    castings for heat treatment plants
    Opis:
    Creep-resistant parts of heat treatment furnaces are in most cases made from high-alloyed chromium-nickel and nickel-chromium iron alloys, both cast and wrought. This paper presents the types of casting alloys used for this particular purpose, since the majority of furnace components are made by the casting process. Standards were cited which give symbols of alloy grades used in technical specifications by the domestic industry. It has been indicated that castings made currently are based on a wider spectrum of the creep-resistant alloy grades than the number of alloys covered by the standards. Alloy grades recommended by the technical literature for individual parts of the furnace equipment were given. The recommendations reflect both the type of the technological process used and the technical tasks performed by individual parts of the furnace equipment. Comments were also made on the role of individual alloying elements in shaping the performance properties of castings.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 31-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Operating Performance of a Cast-Iron Heat Exchanger by Application of a Copper Alloy Coating
    Autorzy:
    Mróz, M.
    Orłowicz, A. W.
    Tupaj, M.
    Jacek-Burek, M.
    Radoń, M.
    Kawiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380088.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vermicular graphite cast iron
    CuTi2Cr coating
    heat flow rate
    heat exchanger
    improvement of performance
    żeliwo grafitowe wermikularne
    powłoka CuTi2Cr
    natężenie przepływu ciepła
    wymiennik ciepła
    poprawa wydajności
    Opis:
    The paper deals with possibility to improve operating performance of cast-iron heat exchangers by providing them with a copper alloy (CuTi2Cr) with the use of the flame spraying method. A test exchanger was cast of a gray cast iron with vermicular graphite in ferritic-pearlitic matrix obtained in production conditions at KAW-MET Iron Foundry with the wire method used to vermicularize the material. The test samples were two plates cast in sand molds, of which one was given a flame-sprayed CuTi2Cr coat on one side. The operating performance of such model cast-iron heat exchangers, with and without CuTi2Cr coating, was tested on a set-up for determining the heat flow rate (thermal power) transferred by the heat exchanger to environment. The obtained results indicate that the value of the heat flow rate characterizing the CuTi2Cr-coated cast-iron heat exchanger was by 10% higher compared to the flow rate of heat conveyed to environment by the heat exchanger without coating.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 84-87
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Materials for Reformer Furnace Tubes. History of evolution
    Autorzy:
    Garbiak, M.
    Jasiński, W.
    Piekarski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380600.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    innovative foundry material
    damage
    reformer furnace tubes
    Ni-Cr austenitic cast steel
    innowacyjna technologia odlewnicza
    innowacyjny materiał odlewniczy
    uszkodzenie
    piec rurowy
    staliwo austenityczne
    Opis:
    The paper discusses progress that has been made over the past sixty years in increasing the service life of centrifugally cast, creepresistant tubes operating in reformer furnaces. Attention was mainly focused on the principles of selection of the chemical composition of castings to improve their creep behaviour. The reasons accounting for withdrawal of tubes from service were indicated. Examples of chemical composition and mechanical properties obtained in creep-resistant Ni-Cr cast steel used by the leading European tube manufacturers were stated. Trends in current research aiming at further improvement of the tube performance characteristics were mentioned.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 47-52
    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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