The effect of the phase composition of compound layer on the growth kinetics of the nitrided layer.

• Autorzy: Ratajski J. , Tacikowski J. , Olik R. , Suszko T.

Warianty tytułu

PL

Wpływ składu fazowego warstwy związków międzymetalicznych na kinetykę wzrostu warstwy azotowanej.

• Konferencja: XVIth Physical Metallurgy and Materials Science Conference on Advanced Materials and Technologies AMT'2001, Gdańsk-Jurata, 16-20 September 2001
• Języki publikacji: EN

Abstrakty

EN

This paper presents part of research work on kinetics of formation and growth of nitrided layers on 40HM steel that was conducted within the research project devoted to the control of gaseous nitriding processes. The purpose of the research was to find answers to still opened questions connected with the optimization of the growth kinetics of nitrided layer. It has been demonstrated in particular how important in diffusion layer kinetics of growth on steel is the role-played by compound layer phase composition. Mainly, this refers to designing changes of parameters in processes where accurate formation of layer on precise parts with required tolerance of size changes is demanded. It comes out of the presented research that proper diffusion layer growth kinetics can be achieved when phase epsilon dominates in the compound layer. This domination of phase epsilon influences speed of growth of the compound layer and first of all growth of diffusion layer. The obtained results are also a starting point for working-out of good functional relations which could create good basis for designing of algorithms of potential values changes in the function of the process time which provides the optimal kinetics of the growth of the layers. In this respect it has been achieved very good qualitative relation between the simulated distribution of nitrogen concentration in the layer and experimentally established distribution of hardness.

Słowa kluczowe

EN

phase composition; growth kinetics; nitrided layers; steel; optimization; gas nitriding; hardness; simulation

PL

skład fazowy; kinetyka wzrostu; warstwa azotowana; stal; optymalizacja; azotowanie gazowe; twardość; symulacja

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2001
• Tom: R. XXII, nr 5
• Strony: 757--760
• Opis fizyczny: Bibliogr. 6 poz., tab., rys.

Twórcy

autor

Ratajski J.

• Technical University of Koszalin, Poland

autor

Tacikowski J.

• Institute of Precision Mechanics, Warsow, Poland

autor

Olik R.

• Technical University of Koszalin, Poland

autor

Suszko T.

• Technical University of Koszalin, Poland

• Technical University of Koszalin

Bibliografia

• [1] Lighfoot B. J., Jack D. H.: Kinetics of nitriding with and without white-layer formation. Proc. of the Conf. on Heat Treatment, London 1973.
• [2] Ratajski J., Olik R., Tacikowski J.: Nitrided layers nucleation and growth problems. Proc. of the 11th Cong, of the International Federation for Heat Treatment and Surface Engineering, Florence 1998.
• [3] Mittemeijfer E. J., at all.: Microstructure of nitrocarburized steels. Proc. of the Conf. on Heat Trestment, London 1981.
• [4] Ratajski J.: Kinetyka wzrostu warstwy azotowanej na żelazie. Praca doktorska, IMP, Warszawa 1986.
• [5] Małdziński L., Tacikowski J.: Symulacyjne badania wzrostu warstwy azotowanej. Inżynieria Powierzchni, 1999, 2.
• [6] Ratajski J.: Monitoring of nitride layer growth with the use of magnetic sensor. Surface Engineering, in press.