Interaction of nitrogen atoms in expanded austenite formed in pure iron by intense nitrogen plasma pulses

• Autorzy: Piekoszewski J. , Sartowska B. , Waliś L. , Werner Z. , Kopcewicz M. , Prokert F. , Stanisławski J. , Kalinowska J. , Szymczyk W.
• Języki publikacji: EN

Abstrakty

EN

The paper presents the results of experiments on modification of pure iron by high-intensity nitrogen pulsed-plasma treatment. The duration of nitrogen plasma pulses is approximately 1 mi s, and the energy density amounts to about 5 J/cm2. Such pulses are capable to melt the surface layer of the substrate (1- 2 mi m) and to introduce a significant concentration of nitrogen into the molten layer. Nuclear reaction analysis (NRA), X-ray diffraction (XRD) and conversion electron Mössbauer spectroscopy (CEMS) were used for characterisation of the treated samples. The main results of the data analysis are as follows: it has been stated that such treatment leads to gradual transformation of initial alfa-phase into austenitic gamma structure in which expanded austenite gammaN is present. Treatment with 20 pulses results in almost complete transformation and introduces a retained dose of nitrogen estimated as 5.5 × 1017 N/cm2. The susceptibility for expansion of the lattice transformed to austenite in this way is smaller than in the case when the steel subjected to conventional nitriding is originally of austenite type. The analysis of the ratio of alfa to gammaN as a function of the nitrogen content provides a firm evidence that strong repulsion forces act between the first and the second nearest-neighbour nitrogen atoms in the fcc austenitic structure formed as a result of nitriding of pure iron by intense nitrogen plasma pulses.

Słowa kluczowe

EN

alfa-to-gamma phase transformation in iron; expanded austenite; intense nitrogen plasma pulses

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2004
• Tom: Vol. 49, nr 2
• Strony: 57--60
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Piekoszewski J.

• The Andrzej Sołtan Institute for Nuclear Studies, 05-400 Otwock-Świerk, Poland
• Institute of Nuclear Chemistry and Technology, 16 Dorodna Str., 03-195 Warsaw, Poland, Tel.: [phone], Fax: [phone]

autor

Sartowska B.

• Institute of Nuclear Chemistry and Technology, 16 Dorodna Str., 03-195 Warsaw, Poland

autor

Waliś L.

• Institute of Nuclear Chemistry and Technology, 16 Dorodna Str., 03-195 Warsaw, Poland

autor

Werner Z.

• The Andrzej Sołtan Institute for Nuclear Studies, 05-400 Otwock-Świerk, Poland
• Institute of Physical Chemistry PAS, 44/52 Kasprzaka Str., 01-224 Warsaw, Poland

autor

Kopcewicz M.

• Institute of Electronic Materials Technology, 133 Wólczyńska Str., 01-919 Warsaw, Poland

autor

Prokert F.

• Forschungszentrum Rossendorf e.V., Institut für Ionenstrahlphysik und Materialforschung, Postfach 510119, D-01314 Dresden, Germany

autor

Stanisławski J.

• The Andrzej Sołtan Institute for Nuclear Studies, 05-400 Otwock-Świerk, Poland

autor

Kalinowska J.

• Institute of Electronic Materials Technology, 133 Wólczyńska Str., 01-919 Warsaw, Poland

autor

Szymczyk W.

• The Andrzej Sołtan Institute for Nuclear Studies, 05-400 Otwock-Świerk, Poland

Bibliografia

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