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Crystallization of GX2CrNiMoCuN 25-6-3-3 Grade Alloy Cast Steel and its Microstructure in the As-cast State and After Heat Treatment

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EN
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EN
The paper presents the results of research conducted in the field of crystallization and microstructure of duplex alloy cast steel GX2CrNiMoCuN 25-6-3-3 grade. The material for research was the above-mentioned cast steel with a chemical composition compliant with the relevant PN-EN 10283 standard, but melted at the lowest standard allowable concentration of alloying additives (some in short supply and expensive), i.e. Cr, Ni, Mn, Mo, Cu and N. The analysis of the crystallization process was performed based on the DTA (Derivative Thermal Analysis) method for a stepped casting with a thickness of individual steps of 10, 20, 40 and 60 mm. The influence of wall thickness was also taken into account in the cast steel microstructure testing, both in the as-cast state and after solution heat treatment. The phase composition of the cast steel microstructure was determined by using an optical microscope and X-ray phase analysis. The analysis of test results shows that the crystallization of tested cast steel uses the ferritic mechanism, while austenite is formed as a result of solid state transformation. The cast steel under analysis in the as-cast state tends to precipitate the undesirable σ-type Fe-Cr intermetallic phase in the microstructure, regardless of its wall thickness. However, the casting wall thickness in the as-cast state affects the austenite grain size, i.e. the thicker the casting wall, the wider the γ phase grains. The above-mentioned defects of the tested duplex alloy cast steel microstructure can be effectively eliminated by subjecting it to heat treatment of type hyperquenching.
Rocznik
Strony
94--103
Opis fizyczny
Bibliogr. 14 poz., il., rys., tab., wykr.
Twórcy
  • Silesian University of Technology, Department of Foundry Engineering, Gliwice, Poland
  • Silesian University of Technology, Department of Foundry Engineering, Gliwice, Poland
  • Silesian University of Technology, Department of Foundry Engineering, Gliwice, Poland
  • Silesian University of Technology, Materials Research Laboratory, Gliwice, Poland
Bibliografia
  • [1] Chojecki, A., Telejko, I. (2003). The foundry engineering of cast steel. Kraków: Akapit. (in Polish).
  • [2] Perzyk, M., Waszkiewicz, S., Kaczorowski, M., Jopkiewicz, A. (2004). Foundry engineering. Warszawa: WNT. (in Polish).
  • [3] Gunn, R. (1997). Duplex stainless steels - microstructure, properties and applications. Cambridge: Woodhead Publishing.
  • [4] Stradomski, G. (2016). Influence of the sigma phase morphology on shaping the properties of steel and duplex cast steel. Częstochowa: Publishers of Czestochowa University of Technology. (in Polish).
  • [5] Voronenko, B. (1997). Austenitic-ferritic stainless steels: A state-of-the-art review. Metal Science and Heat Treatment. 39(10), 428-437. https://doi.org/10.1007/BF02484228.
  • [6] Kalandyk, B. (2011). Characteristics of microstructure and properties of castings made from ferritic-austenitic steel. Katowice – Gliwice: AFE. (in Polish).
  • [7] Stradomski, G. (2017). The analysis of AISI A3 type ferritic_austenitic cast steel crystallization mechanism. Archives of Foundry Engineering. 17(3), 229-233. https://doi.org/10.1515/afe-2017-0120.
  • [8] Šenberger, J., Pernica, V., Kaňa, V. & Záděra, A. (2018). Prediction of ferrite content in austenitic Cr-Ni steel castings during production. Archives of Foundry Engineering. 18(3), 91-94. https://doi.org/10.24425/123608.
  • [9] Kaňa, V., Pernica, V., Záděra, A. & Krutiš, V. (2019). Comparison of methods for determining the ferrite content in duplex cast steels. Archives of Foundry Engineering. 19(2), 85-90. https://doi.org/10.24425/afe.2019.127121.
  • [10] Yamamoto, R., Yakuwa, H., Miyasaka, M. & Hara, N. (2019). Effects of the α/γ-phase ratio on the corrosion behavior of cast duplex stainless steel. Corrosion. 76(9), 815-825. https://doi.org/10.5006/3464.
  • [11] Jurczyk, P., Wróbel, T. & Baron, C. (2021). The influence of hyperquenching temperature on microstructure and mechanical properties of alloy cast steel GX2CrNiMoCuN 25-6-3-3. Archives of Metallurgy and Materials. 66(1), 73-80. https://doi.org/10.24425/amm.2021.134761.
  • [12] Kalandyk, B., Zapała, R. & Pałka, P. (2022). Effect of isothermal holding at 750 °C and 900 °C on microstructure and properties of cast duplex stainless steel containing 24% Cr-5% Ni-2.5% Mo-2.5% Cu. Materials. 15(23), 1-17. https://doi.org/10.3390/ma15238569.
  • [13] Wróbel, T., Jurczyk, P., Baron, C. & Jezierski, J. (2023). Search for the optimal soaking temperature for hyperquenching of the GX2CrNiMoCuN 25-6-3-3 duplex cast steel. International Journal of Metalcasting. https://doi.org/10.1007/s40962-023-01020-x. (in print).
  • [14] Głownia, J. & Banaś, J. (1997). Effect of modification and segregation on the delta-ferrite morphology and corrosion resistance of cast duplex steel. Metallurgy and Foundry Engineering. 23(2), 261-267.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-5d35efcd-fbc5-4007-a471-442e86e440b1
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