The mossabauer spectroscopy studies of ε carbides precipitation

• Autorzy: Krawczyk J. , Bała P. , Hanc A.

Warianty tytułu

PL

Badania wydzieleń węglika ε przy użyciu spektroskopii mossabauerowskiej

• Języki publikacji: EN

Abstrakty

EN

This work complements the knowledge concerning the kinetics of 6 carbide precipitation and decomposition. Investigations were performed on 120MnCrMo V8-6-4-2 steel, which was designed in 1998, in Phase Transformations Research Group of Department of Physical and Powder Metallurgy at the Faculty of Metals Engineering and Industrial Computer Science at AGH University of Science and Technology in Krakow. The samples of investigated steel were austenitized at the temperature of 900°C and hardened in oil. Next, three from four samples were tempered. Tempering consisted of heating the samples up to chosen temperatures with a heating rate of O.OSźC/s and, after reaching desired temperature, fast cooling. CEMS technique was applied for Mossbauer studies. Stabilized retained austenite by heating up to 80źC, in the result of mechanical destabilization, transforms into low-temperature tempered martensite, with the microstructure of low bainite (into the structural constituent in which 6 carbide exists). Influence of hardened steel heating temperature on 6 carbide precipitation was determined. Also the knowledge of the mechanisms of precipitation and decomposition of 6 carbide enables proper design of the heat treatment of 120MnCrMoV8-6-4-2 steel in respect to its application for hot working tools. Mossbauer spectroscopy was applied not only for quantitative analysis of 6 carbide, but also to analyze the values of hyperfine magnetic field, quadrupole splitting, isomeric shift and relation of 2 to 3 Zeeman splitting component line, what resulted in significant conclusions concerning the changes in its morphology and the level of stresses being present in it.

PL

W pracy przedstawiono wyniki pomiarów mossbauerowskich wykonanych na odpuszczonych do wybranych temperatur wczesniej zahartowanych próbkach ze stali 120MnCrMoV8-6-4-2. Pomiary wykonywano zarówno na powierzchniach szlifowanych jak i wypolerowanych po szlifowaniu. Poszczególne składowe widma mossbauerowskiego zostały zidentyfikowane i przypisane odpowiednim fazom. W pracy skupiono się na analizie skladowych pochodzących od węglika ε Do pomiarów mossbauerowskich zastosowano technikę elektronów konwersji wewnętrznej CEMS z detektorem gazowym, wypelnionym objętościowo 98% He + 2% Ar, pod ciśnieniem 0,9 at. Źródłem mossbauerowskim byl 57CoRh o aktywności 10 mCi. Zastosowanie techniki CEMS pozwoliło na badanie warstw powierzchniowych o grubości około 100 nm. Parametry widm składowych zostały wyznaczone w oparciu o program filtrujący MOSDS. Na podstawie analizy nadsubtelnego pola magnetycznego, rozszczepienia kwadrupolowego, przesunięcia izomerycznego, stosunku 2 do 3 linii sekstetu zemanowskiego oraz intensywności widma składowego pochodzącego ad węglików ε wnioskowano na temat produktów destabilizacji austenitu szczątkowego po odpuszczeniu ciągłym do 80C, o wpływie tekstury osnowy na orientację krystalograficzną wydzieleń węglika ε, zakresie temperatur występowania węglików ε w strukturze podczas ciągłego odpuszczania oraz przemianie ε - cementyt. Otrzymane wyniki pozwolą w przyszłych publikacjach na dyskusję, która uzupełni wiedzę na temat kinetyki przemian fazowych przy odpuszczaniu stali stopowych.

Słowa kluczowe

EN

Mössbauer spectroscopy (CEMS); tool steel; tempering; epsilon carbide

PL

spektroskopia Mössbauera; odpuszczanie; węglik ε; węglik epsilon

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2008
• Tom: Vol. 53, iss. 3
• Strony: 689--693
• Opis fizyczny: Bibliogr. 23 poz., rys., tab.

Twórcy

autor

Krawczyk J.

autor

Bała P.

autor

Hanc A.

• Faculty of Metals Engineering and Industrial, Computer Science, AGH University of Science and Technology, 30-059 Kraków, 30 Mickiewicza Av., Poland

Bibliografia

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