High-Speed Quenching from Liquid-Solid State as Method for Studying Phase Transformations at Crystallization

Issues » Volume 44, Issue 2

A. G. Prigunova , V. I. Bielik, L. K. Shenevidko, M. V. Koshelev, S. V. Prigunov

Physico-Technological Institute of Metals and Alloys, NAS of Ukraine, 34/1 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 22.06.2021; final version - 17.09.2021. Download: PDF

The study of the mechanism of phase transformations during the formation of the structure of metals and alloys is a promising direction for improving the known and developing new materials. This makes it necessary to expand the methodological and experimental capabilities of their research. Widely used methods of metallographic analysis provide information on the structural features of alloys. At the same time, to determine the mechanism of phase formation by the microstructure of fully hardened samples is very problematic. The main tools for analysing and predicting the structure when the temperature and composition of the alloys change are phase equilibrium diagrams. However, they cannot be applicable to the description of the kinetics of phase transitions. In particular, this refers to the phases formed by the peritectic reaction which may be not fully completed when the solidification conditions (velocity, pressure, etc.) change, which takes place in real industrial casting processes. The work considers the methodological features of the developed quenching-microstructural analysis method, which allows one to study the stages and nature of phase transformations during solidification regardless of the degree of system metastability. It is based on high-speed hardening from phase transition temperatures determined by the DTA method. It has been shown experimentally that the cooling rates that are realized when using hardening-microstructural analysis are (1.8–3.7)$\cdot10^3$°C/s. Studies performed on the A356 alloy (AK7) using certain cooling rates showed the effectiveness of the proposed method of analysis to study the characteristics of phase transformations during solidification. The mechanism of the formation of iron-containing phases has been determined. It is shown that the main iron-containing phase in the AK7 alloy is a lamellar intermetallic $\beta$-FeSiAl$_5$ compound, which is part of the eutectics. Experimental confirmation of the formation of the $\alpha$-(Fe, Mn)$_3$Si$_2$Al$_{15}$ phase in the AK7 alloy is obtained by both eutectic and peritectic reactions.

Key words: quenching, solidification, phase transformations, cooling rate, A356 alloy (АК7).

URL: https://mfint.imp.kiev.ua/en/abstract/v44/i02/0191.html

DOI: https://doi.org/10.15407/mfint.44.02.0191

PACS: 61.25.Mv, 61.66.Dk, 64.60.My, 81.10.Fq, 81.30.Fb

Citation: A. G. Prigunova , V. I. Bielik, L. K. Shenevidko, M. V. Koshelev, and S. V. Prigunov, High-Speed Quenching from Liquid-Solid State as Method for Studying Phase Transformations at Crystallization, Metallofiz. Noveishie Tekhnol., 44, No. 2: 191—209 (2022) (in Ukrainian)

REFERENCES

R. W. Cahn and P. T. Haazen, Fizicheskoe Materialovedenie [Physical Materials Science] (Moscow: Metallurgiya: 1987) (in Russian).
M. V. Mal'tsev, T. A. Barsukova, and F. A. Borin, Metallografiya Tsvetnykh Metallov i Splavov [Metallography of Non-Ferrous Metals and Alloys] (Moscow: Metallurgiya: 1960) (in Russian).
L. F. Mondol'fo, Struktura i Svoystva Alyuminievykh Splavov [Structure and Properties of Aluminium Alloys] (Moscow: Metallurgiya: 1979) (in Russian).
V. I. Mazur and A. V. Mazur, Vvedenie v Teoriyu Splavov [Introduction to Alloy Theory] (Dnipropetrovsk: Lira LTD: 2009) (in Russian).
V. P. Egunov, Vvedenie v Termicheskiy Analiz [Introduction to Thermal Analy-sis] (Samara: 1966) (in Russian).
V. I. Mazur and Yu. N. Taran, Fazovye Ravnovesiya i Fazovye Prevrashcheniya [Phase Equilibrium and Phase Transformations] (Kyiv: UMK VO: 1988) (in Russian).
K. Kuo, J. Iron and Steel Institute, 176: 433(1954).
H. Brandis and K. Walking, DEW-Teckiscke Berichte, Bd 11, h.3: 139 (1971).
J. McLaughlin, R. Wayne, and J. I. Goldstein, Metall. Mater. Trans. A, 8: 1787 (1977). Crossref
V. I. Mazur, A. G. Prigunova, and Yu. N. Taran, Fiz. Met. Metalloved., 50, Iss. 1: 123 (1980) (in Russian).
M. Baricco, M. Palumbo, D. Baldissin, E. Bosco, and L. Battezzati, La Metal-lurgia Italiana, No. 11-12: 1 (2004).
I. S. Miroshnichenko, Zakalka iz Zhidkogo Sostoyaniya [Quenching from a Liq-uid State] (Moscow: Metallurgiya: 1982) (in Russian).
K. Sudzuki, Kh. Fudzimori, and K. Khasimoto, Amorfnye Metally [Amorphous Metals] (Moscow: Metallurgiya: 1987) (in Russian).
A. M. Glezer and N. A. Shurygina, Amorfno-Nanokristallicheskie Splavy [Amorphous-Nanocrystalline Alloys] (Moscow: Fizmatlit: 2013) (in Russian).
J. D. B. DeMello, M. Durand-Charre, and S. Hamar-Thibault, Metall. Mater. Trans. A, 14: 1793 (1983). Crossref
R. S. Jacson, J. Iron and Steel Institute, 176: 433 (1954).
E. P. Kalinushkin and E. Ya. Vasilev, Zakonomernosti Formirovaniya Struktury Splavov Evtekticheskogo Tipa [Regularities of the Formation of the Structure of Eutectic-Type Alloys] (Dnipropetrovsk: DMetI: 1982) (in Russian).
F. Ya. Galakhov, Sovremennye Metody Issledovaniya Silikatov i Stroitel'nykh Materialov [Modern Research Methods for Silicates and Building Materials] (Moscow: Gosstroyizdat: 1961) (in Russian).
E. P. Kalinushkin, E. V. Arshava, and O. S. Yakushev, MiTOM, No. 9: 13 (1987) (in Russian).
V. I. Ul'shin and S. V. Ul'shin, Visnyk UMT, No. 1(7): 68 (2014) (in Russian).
A. H. Pryhunova, L. K. Shenevid'ko, V. Yu. Sheyham, S. V. Pryhunov, and M. V. Koshelyev, Sposib Doslidzhennya Fazovykh Peretvoren' i Morfolohiyi Faz u Protsesi Krystalizatsiyi [Method of Research of Phase Transformations and Morphology of Phases in the Process of Crystallization], Patent of Ukraine No. 124431 (Published August, 25, 2020) (in Ukrainian).
A. H. Pryhunova, L. K. Shenevid'ko, V. Yu. Sheyham, S. V. Pryhunov, M. V. Koshelyev, and A. M. Neduzhyy, Prystriy dlya Doslidzhennya Fazovykh Peretvoren' i Morfolohiyi Faz u Protsesi Krystalizatsiyi [Device for Research of Phase Transformations and Morphology of Phases in the Process of Crystalliza-tion], Patent of Ukraine No. 123741 (Published August, 25, 2020) (in Ukrainian).
V. I. Elagin, Metallovedenie Legkikh Splavov, [Metallurgy of Light Alloys] (Moscow: Nauka: 1965), p. 60 (in Russian).
A. G. Prigunova, Metallofiz. Noveishie Tekhnol., 20, No. 12: 25 (1998) (in Rus-sian).
B. I. Bondarev, Yu. V. Shmakov, L. A. Arbuzova, M. V. Zeninia, and V. I. Tararyshkin, Obrabotka Legkikh i Spetsial'nykh Splavov [Processing of Light and Special Alloys] (Moscow: VILS: 1996) (in Russian).
A. P. Skuratov and A. A. P'yanykh, Teplofizika i Aeromekhanika, 19, No. 2: 155 (2012) (in Russian).
A. G. Prigunova, N. A. Belov, Yu. N. Taran, V. Zolotorevskiy, V. Napalkov, and S. S. Petrov, Siluminy. Atlas Mikrostruktur i Fraktogramm Promyshlennykh Splavov [Silumin. Atlas of Microstructures and Fractograms of Industrial Alloys] (Moscow: MISiS: 1996) (in Russian).
E. Kh. Ri, S. V. Dorofeev, and Khosen Ri, Vestnik Komsomol'skogo-na-Amure Gosudarstvennogo Tekhnicheskogo Universiteta, Iss. 8: 77 (2007) (in Russian).
A. Yu. Aksenenko, S. A. Bychkov, V. N. Klimov, N. V. Korobova, F. E. Tarasov, V. E. Frizen, and S. Yu. Shevchenko, Metallurgiya Mashinostroeniya, No. 2: 17(2013) (in Russian).