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Właściwości i zastosowanie surowców wytwarzanych metodą topienia łukiem elektrycznym

Skalska Małgorzata

Materiały Ceramiczne

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2020

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T. 72, nr 1

49--55

PL

Technologia topienia łukiem elektrycznym zastosowana w procesie wytwarzania surowców do produkcji materiałów ogniotrwałych stwarza szerokie możliwości głównie w zakresie kształtowania ich mikrostruktury. Zakłady Magnezytowe „ROPCZYCE” S.A., realizując wspólnie z Wydziałem Inżynierii Materiałowej i Ceramiki AGH w Krakowie projekt POIG POIG Działanie 1.4 „Zastosowanie kruszyw otrzymanych z krajowych surowców alternatywnych w materiałach ogniotrwałych”, opracowały technologię i uruchomiły linię technologiczną dla procesu topienia. Od roku 2014 systematycznie poszerzany jest asortyment gatunkowy wytwarzanych kruszyw topionych. W artykule przedstawiono ich właściwości oraz zastosowania w technologii materiałów ogniotrwałych. Podsumowano także uzyskane efekty w zakresie trwałości wyrobów wyprodukowanych z udziałem wytworzonych kruszyw topionych.

EN

The technology of electric arc melting used in the production of raw materials for the manufacture of refractory materials provides a wide range of possibilities, mainly in terms of shaping their microstructure. Zakłady Magnezytowe „ROPCZYCE” S.A., implementing a project included in Operational Programme lnnovative Economy (POIG) – POIG Action 1.4 „Application of aggregates obtained from alternative domestic raw materials in refractories” in co-operation with the Faculty of Materials Science and Ceramics of AGH in Cracow, has developed the technology and started-up the first technological line for the melting process. Since 2014, the assortment of produced fused clinkers has been systematically extended. The paper presents their properties and applications in refractory materials technology. The obtained effects in terms of durability of products manufactured with the use of developed fused clinkers are also summarized.

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The comparison of the structure and microhardness of the tool steel C90 and HS 6-5-2 remelted with the electric arc

Dziedzic A., Adamiak S.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 2

39--42

EN

The examination of the structure and microhardness of surface layer of C90 non-alloy steel and HS 6-5-2 high speed steel after electric arc treatment are presented in the paper. The comparison has been presented due to the similar content of the carbon in both steels. The structure of the remelted zone of the steel C90 before the conventional tempering consists of the cells, dendritic cells surrounded with the cementite, there is a plate martensite and retained austenite inside them, whereas the structure of the steel HS 6-5-2 is consistuted with cells, dendritic cells and dendrites surrounded with the eutectic system, inside of which there is a plate martensite and retained austenite. Such structure is characterized by the similar microhardness (790-800 HV0,065) and intensity of the tribiological wear. The tempering causes the decrease of the microhardness in non-alloy steel and the increase of the microhardness in high speed steel.

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Microstructures in Fe30Ni30Cu20P10Si5B5 melt-spun alloy ejected at various temperatures

Ziewiec K., Ziewiec A., Prusik K.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 37, nr 2

532-537

EN

Purpose: The aim of the work is to study the influence of ejection temperature on the structure of Fe30Ni30Cu20P10Si5B5 melt-spun. Design/methodology/approach: A six-component Fe30Ni30Cu20P10Si5B5 alloy was arc-melt in argon protective atmosphere from of pure Fe, Ni, Cu elements and Fe-P, Fe-B, Ni-P, Ni-B master alloys and melt-spun in helium. The alloy was melt-spun in various temperatures. Morphology and chemical composition of the cross-section of the ingot and melt-spun ribbons were analysed with scanning electron microscope SEM with energy dispersive spectrometer EDS. The melt-spun ribbon was investigated by means of the transmission electron microscope (TEM). The melting range of the alloy was investigated by means of differential thermal analysis at the heating rate 20 K/min. Findings: The slow cooling rate resulted in the fractal-like structures formed by the Fe-rich regions and Cu-rich regions typical for the alloying system with a miscibility gap. The structures observed after rapid cooling were dependent on ejection temperatures of the alloy just before the melt spinning process. The lower ejection temperatures led to the formation of crystalline structures separated into Fe-rich and Cu-rich regions which were a result of rapid cooling within the miscibility gap. The higher ejection temperatures contributed to formation of amorphous/crystalline composite. The crystalline spherical precipitates were found to be predominantly Cu-base solid solution. Research limitations/implications: It has been shown that the multi-component Fe-Ni-Cu-P-Si-B alloy provides possibility of microstructure control of amorphous/crystalline composite due to miscibility gap. Practical implications: The work reports that the ductile phase can be introduced into the amorphous alloy by using a suitable ejection temperature control in a melt spinning process, providing possibility of controlling properties in glassy matrix alloys. Originality/value: The study provides original information about the primary structure of the arc-melt Fe30Ni30Cu20P10Si5B5 alloy as well as about the microstructure of melt-spun alloy using various ejection temperatures.

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Corrosion of nickel aluminide in H2/H2S Gas mixtures.

Godlewska E., Żurek Z.

Inżynieria Materiałowa

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1998

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R. XIX, nr 4

933-936

EN

Intermetallic compound beta-NiAl was sulphidized in H2/H2S mixtures with sulphur partial pressures raised to a -5th power Pa - 1 Pa at temperatures 1173 and 1273 K. The sulphidation runs, followed thermogravimetrically, were approximately parabolic. The calculated parabolic rate constants were very low and slightly increased with temperature and partial pressure of sulphur. The reaction products were examined by means of X-ray diffraction (XRD), energy dispersive X-ray (EDX) analyses and scanning electron microscopy (SEM). Aluminium sulphide and nickel-aluminium sulphospinel were predominant scale constituents in the applied experimental conditions. The scales were very thin and flaky. Generally two scale layers could be distinguished, the inner one was compact and outer one was discontinuous and consisted of needle-like or plate-like crystals. There was no evidence of internal sulphidation.