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The paper presents the results of evaluation of the metallurgical quality of master heat ingots and of the identification of non-metallic inclusions (oxides of Al., Zr, Hf, Cr, etc.), which have been found in the shrinkage cavities formed in these ingots. The inclusions penetrate into the liquid alloy, and on pouring of mould are transferred to the casting, especially when the filtering system is not sufficiently effective. The specific nature of the melting process of nickel and cobalt alloys, carried out in vacuum induction furnaces, excludes the possibility of alloy refining and slag removal from the melt surface. Therefore, to improve the quality of castings (parts of aircraft engines), it is so important to evaluate the quality of ingots before charging them into the crucible of an induction furnace. It has been proved that one of the methods for rapid quality evaluation is an ATD analysis of the sample solidification process, where samples are taken from different areas of the master heat ingot. The evaluation is based on a set of parameters plotted on the graph of the dT/dt derivative curve during the last stage of the solidification process in a range from TEut to Tsol.
Czasopismo
Rocznik
Tom
Strony
5--10
Opis fizyczny
Bibliogr. 17 poz., rys., wykr.
Twórcy
autor
autor
autor
autor
- Chair of Materials Technology, Silesian University of Technology, Krasińskiego Str. 8, 40-019 Katowice, Poland, franciszek.binczyk@polsl.pl
Bibliografia
- [1] F. Zupanic, T. Boncina, A. Krizman, F. D. Tichelaar. (2001) Structure of continuously cast Ni-based superalloy Inconel 713C, Journal of Alloys and Compounds, Volume 329, Issue 1-2, .290-297.
- [2] M. Tabuchi, K. Kubo, K. Yagi, A. T. Yokobori Jr, A. Fuji (1999) Results of a Japanese round robin on creep crack growth evaluation methods for Ni-base superalloys, Engineering Fracture Mechanics, Volume 62, Issue 1, 47-60.
- [3] Chmiela B., Sozańska M., Rodak K. (2-12) Phase identification in nickel-based superalloys using EBSD/SEM and electron diffraction in STEM; ; Solid State Phenomena, 186, 58-61.
- [4] Jura S., Sakwa J., Borek K. (1980) Zastosowanie analizy termicznej i różniczkowej dla określenia parametrów składu chemiczneg, Krzepnięcie Metali i Stopów, 2, PAN.
- [5] Binczyk F., Krzemień E. (1980) Zastosowanie różniczkowych krzywych krzepnięcia w badaniach krystalizacji żeliwa, Mat. Konferencyjne "Krzepnięcie Metali i Stopów", PAN, Mechanika 23, Gliwice.
- [6] Jura S. (1992) Krzywa kalorymetryczna w analizie termicznej i derywacyjnej procesu krystalizacji metali i stopów, Krzepnięcie Metali i Stopów, t. 14, PAN-Katowice, Komisja Odlewnicza.
- [7] Pietrowski S., Władysiak R. (1996) Kontrola metodą ATD siluminów tłokowych, Krzepnięcie Metali i Stopów, 28, PAN, Katowice.
- [8] Zielińska M. Sieniawski J., Poreba M. (2007) Microstructure and mechanical properties of high temperature creep resisting superalloy Rene 77 modified CoAl2O4, Archives of Materials Science and Engineering, vol. 28, issue 10, pp. 629-632.
- [9] Zielińska M., Sieniawski J., Wierzbińska M. (2008) Effect of modification on microstructure and mechanical properties of cobalt casting superalloy, Archives of Metallurgy and Materials, vol. 53, issue.3,.887-893.
- [10] F. Binczyk, J. Śleziona (2010): Effect of modification on the mechanical properties of IN-713C alloy, Archives of Foundry Engineering, vol.10, Issue 1, pp.195-198.
- [11] Binczyk F., Śleziona J. (2010) Mechanical properties and creep resistance behaviour of IN-713C alloy castings, Archives of Foundry Engineering, vol.10, Issue 4, 9-13., ISSN 1897-3310.
- [12] Binczyk F., Śleziona J., Gradoń P. (2011) Modification of the macrostructure of nickel superalloys with cobalt nanoparticles, Composites, No., 49-55, ISSN 1641-8611.
- [13] F. Binczyk, J. Śleziona, P. Gradoń (2011) Ceramic filters for bulk inoculation of nickel alloy castings, Archives of Foundry Engineering, vol.11, Special Issue 3, 29-33, ISSN 1897-3310.
- [14] F. Binczyk, J. Śleziona, J. Szymszal, P. Gradoń (2011) Effect of technological parameters on structure of castings made from IN-713C nickel alloy, Archives of Foundry Engineering, vol.11, Issue 4, 9-13. ISSN 1897-3310.
- [15] F. Binczyk, J. Śleziona, T. Mikuszewski (2010) Effect of repeated remelting on the chemical composition and structure of nickel alloys, Archives of Foundry Engineering, vol.10, Special Issue 1, 189-194, ISNN 1897-3310.
- [16] Binczyk F., Śleziona J., Cwajna J., Roskosz S. (2008) ATD and DSC analysis of nickel super alloys, Archives of Foundry Engineering ol. 8,Issue 3.5-9, ISSN 1897-3310.
- [17] F. Binczyk, J. Śleziona (2010) The ATD thermal analysis of selected nickel superalloys, Archives of Foundry Engineering, vol.10, Issue 2, 13-19. ISSN 1897-3310.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPZ7-0006-0028