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Wyświetlanie 1-4 z 4
Tytuł:
Segregation of Elements in Continuous Cast Carbon Steel Billets Designated for Long Products
Autorzy:
Hutny, A. M.
Warzecha, M.
Derda, W.
Wieczorek, P.
Powiązania:
https://bibliotekanauki.pl/articles/354222.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting
billet
segregation
Opis:
This article presents research results concerning designation of the scope of segregation of elements by analysing the ingot, designated for hot rolling of long products. The research tests were performed under industrial conditions, during continuous casting production cycle of high carbon steels. From cc ingots with square cross-section of 160 mm samples having the length of 400 mm were collected, out of which two samples were cut up, the so-called templates with the thickness of 20 mm. Segregation of elements was determined based on the quantitative analysis of results performed by using spark spectrometry pursuant to PN-H-04045. Changes in concentrations of elements were analysed along the line, which join the opposite sides of the sample in their half length and pass through the geometric centre of the square cross-section. In the further course of the research study, there was also determined the segregation along perpendicular line up to the surface connecting the core of the cross-section with lateral plane. Designations of element contents were performed at points distanced from each other by approx. 10 mm and situated on the lines. There was found segregation of carbon, sulphur and phosphorus.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2037-2042
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Solidification of Continuously Cast Steel Round Billets Using Numerical Modellin
Autorzy:
Tkadleckova, M.
Válek, L.
Socha, L.
Saternus, M.
Pieprzyca, J.
Merder, T.
Michalek, K.
Kováč, M.
Powiązania:
https://bibliotekanauki.pl/articles/353911.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steel
billet
continuous casting
numerical modelling
metallurgical length
Opis:
The paper is dedicated to the verification of solidification of continuously cast round steel billets using numerical modelling based on the finite element method. The aim of numerical modelling is to optimize the production of continuously cast steel billets of round format. The paper describes the pre-processing, processing and post-processing phases of numerical modelling. Also, the problems with determination of the thermodynamic properties of materials and the heat transfer between the individual parts of the casting system, including the definition of the heat losses along the casting strand in the primary and secondary cooling, were discussed. The first results of numerical simulation show the so-called thermal steady state of continuous casting. The temperature field, the metallurgical length and the thickness of the shell at the end of the mould were predicted. The further research will be concentrated on the prediction the risk of the cracks and the porosity based on the different boundary conditions.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 221-226
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segregation of Elements in Billets Made of Carbon Steels for Long Products
Autorzy:
Hutny, A. M.
Warzecha, M.
Wieczorek, P.
Derda, W.
Powiązania:
https://bibliotekanauki.pl/articles/354733.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steelmaking
continuous casting
billet
segregation
optical emission spectrometry
Opis:
The article presents the results of investigations performed on segregation of elements in the billets. The research were performed under standard industrial conditions, during high carbon steel production cycle. Probes (templates with the thickness of 20 mm) were taken from billets with square cross-section of 160 mm. Segregation of elements was determined based on the quantitative analysis of results performed by using spark spectrometry pursuant to PN-H-04045. Changes in concentrations of elements were analysed along two cross-sections. Element contents were performed at points distanced from each other by approx. 10 mm. The segregation of carbon, sulphur and phosphorus was determined for different billets.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 2075-2079
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza i opracowanie efektywnego sposobu wstępnego nagrzewania narzędzi do kucia na gorąco
Autorzy:
Widomski, P.
Skwarski, M.
Rychlik, M.
Powiązania:
https://bibliotekanauki.pl/articles/1189982.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
narzędzia kuźnicze
matryca kuźnicza
wkładka matrycowa
materiał wsadowy
preheating
forging die
tempering
billet
Opis:
This article contains an overview of available preheating methods which are commonly used in hot forging processes. Then a comprehensive analysis of the temperature changes that occur on the surface and directly below the surface of the forging die was carried out during the preheating process. The temperature measurement was performed with fast thermal camera and a thermocouple inserted inside the tool. The temperature was measured in traditional preheating process, and its value after preheating was about 200ºC, which can be acceptable, however this process was improper, because of possibility of tempering surface layer of forging tool. That’s why new method of preheating tools in contact with heated billets was developed and detailed instructions for time and layout of billets were prepared. The tool temperature was measured also after application of new method presented in this manuscript, and it reached over 200ºC after two preheating cycles. After three cycles of preheating also good results obtained because temperature in surface layer was about 260ºC. In conclusion, method proposed by authors obtained good result, is quite efficient and prevents from tempering of forging tools. Finally, two pre-heating instructions were prepared, for the Massey 2500T press and the Massey 1300T press, which are attached at the end of the manuscript.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2017, 5, 1; 27--32
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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