Niskotemperaturowe azotowanie stali austenitycznej

• Autorzy: Baranowska, J.

Warianty tytułu

EN

Low temperature nitriding of stainless steel

• Języki publikacji: PL

Abstrakty

PL

W pracy przedstawiono kompleksową analizę zjawisk zachodzących podczas niskotemperaturowego (< 500°C) azotowania gazowego ze wstępnym rozpylaniem jonowym. Pierwsza część pracy obejmuje analizę stanu zagadnienia i przedstawia istniejące hipotezy dotyczące budowy i wzrostu warstw azotowanych zawierających fazę γN. Istniejące w literaturze modele oparte przede wszystkim na badaniach procesów azotowania jonowego, podane zostały krytycznej analizie opartej na wynikach badań własnych dotyczących obróbki gazowej. Pozwoliło to na sformułowanie celu pracy i opracowanie planu badań przedstawionego w rozdziale 3. W rozdziale 4. omówiono metodykę badań obejmującą badanie wpływu parametrów wstępnego rozpylania jonowego (rodzaju gazu rozpylającego, wartości napięcia i natężenia) oraz warunków azotowania gazowego (temperatury i składu atmosfery azotującej). Otrzymane warstwy poddano badaniom mikrostrukturalnym oraz badaniom właściwości eksploatacyjnych. Wyniki przedstawiono w rozdziale 5. Omówiono wpływ parametrów rozpylania na mikrostrukturę i morfologię składników strukturalnych warstw azotowanych stali austenitycznej. Przeanalizowano wpływ orientacji krystalograficznej ziaren podłoża na konstytułowanie warstwy zawierającej magnetyczną fazę γN. Porównano wyniki badań do danych literaturowych dotyczących warstw azotowanych jonowo. Efektywność rozpylania jonowego oceniono przez porównanie z innymi metodami aktywacji powierzchni. Określono wpływ warunków obróbki gazowej na budowę fazową oraz kinetykę wzrostu warstw azotowanych. Wyznaczono podstawowe charakterystyki użytkowe otrzymanych warstw azotowanych (twardość, szybkość zużycia ściernego, odporność korozyjna) i porównano je z warstwami azotowanymi w temperaturze powyżej 500°C. Analiza wyników badań przedstawiona w rozdziale 6. pozwoliła na postawienie hipotezy dotyczącej mechanizmu wzrostu warstwy azotowanej na stali austenitycznej podczas niskotemperaturowego azotowania. Sklasyfikowano typowe warstwy azotowane otrzymywane podczas azotowania stali austenitycznej. Ponadto omówiono praktyczne aspekty wykorzystania niskotemperaturowego azotowania gazowego oraz wskazano podstawowe parametry wpływające na kształtowanie warstwy azotowanej i jej właściwości użytkowych.

EN

The monograph presents a complex analysis of phenomena occurring during low temperature (below 500°C) gas nitriding with ion sputtering used as an activating pre-treatment. The state-of-the art analysis is presented in the first part of the book, where current hypotheses concerning the composition and growth of nitrided layers composed of γN phase are discussed. The existing models of nitriding mainly concern plasma processes and they are critically analysed in chapter 2 on the basis of the author's own research into gas nitriding. It enabled the author to define her goals and draw an agenda of the research to be carried out. The goals are presented in chapter 3 together with the research plan. Chapter 4 presents the methodology to be used in the investigations, which includes studies on the parameters of ion treatment (type of sputtering gas used, current density and voltage) and gas nitriding processes (temperature and nitriding atmosphere composition). The properties of microstructure and layers were also investigated and the results are presented in chapter 5. The influence of sputtering parameters on the microstructure of the nitrided layers is discussed. Moreover, the importance of crystallographic orientation of austenitic matrix for γN phase growth is analysed. The results were compared with those for ion nitriding already presented in literature. The effectiveness of ion sputtering is compared with other activation techniques. The influence of gas treatment parameters on phase composition as well as on the growth kinetics of the nitrided layers is evaluated. The main functional characteristic of the layers are measured (hardness, wear and corrosion resistance) and compared with layers nitrided above 500°C. The discussion of the results presented in chapter 6 allows to formulate a new hypothesis concerning the mechanisms of the growth of nitrided layer on austenitic steel. Additionally, typical microstructures of nitrided layers are classified. Moreover, the aspects of practical applications of low temperature nitrided layers are presented together with technologically important parameters of nitriding process.

Słowa kluczowe

PL

azotowanie gazowe; warstwa wierzchnia; inżynieria powierzchni; stal nierdzewna; stal austenityczna

• Czasopismo: Prace Naukowe Politechniki Szczecińskiej. Instytut Inżynierii Materiałowej
• Rocznik: 2007
• Tom: Nr 596 (21)
• Strony: 5-128
• Opis fizyczny: Bibliogr. 197 poz., tab., rys.

Twórcy

autor

Baranowska, J.

• Instytut Inżynierii Materiałowej Politechniki Szczecińskiej

Bibliografia

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