Investigating the effects of laser stellite pad welding on the service properties of valve steels

• Autorzy: Bogdanowicz Z. , Grzelak K.
• Języki publikacji: EN

Abstrakty

EN

In the work the results of tests on 50H21G9N4 and H9S2 valve steels with pad welded stellite layers are presented. Basic properties such as tribological and erosion resistance as well as high temperature oxidation resistance were determined. Testing conditions were accepted with certain simplification owing to the complexity oj mechanical and thermal load exhaust valves and, therefore, they do not reflect real operating conditions accurately. Specimens with and without laser, plasma and TIG pad welded stellite layers were subject to tests. The conducted tests showed the highest tribological resistance of stellite layers under the conditions of dry friction in comparison with the material in the initial state as well as plasma and TIG pad welded stellite layers. The main mechanism of the abrasive wear of the surface layer is an adhesive wear by breaking the connections and adhesions that are being formed. The research on wear by abrasive erosion showed a smaller decrease in the mass of specimens with pad welded stellite layers in comparison with plasma and TIG pad welded stellite layers as well as the material in the initial form without the pad welded stellite layer. The resistance of stellite layers to high temperature oxidation was showed in the research on heat resistance. Moreover, it was found that pad welding does not have any significant influence on the heat resistance of stellite layers.

Słowa kluczowe

EN

internal combustion engine; exhaust valve; laser pad welding; surface layer; service proprieties

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2009
• Tom: Vol. 16, No. 1
• Strony: 41--50
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Bogdanowicz Z.

autor

Grzelak K.

• Military University of Technology, Faculty of Mechanical Engineering Gen. S. Kaliskiego 2, 00-908 Warsaw, Poland tel [phone],

Bibliografia

• [1] Lanc, J., Zawory silników spalinowych, Wydawnictwa Komunikacji i Łączności, Warszawa, 1963.
• [2] Matzke, W., Projektowanie rozrządu czterosuwowych silników trakcyjnych, Wydawnictwa Komunikacji i Łączności, Warszawa, 1989.
• [3] Burakowski, T., Wierzchoń, T., Inżynieria powierzchni metali, WNT, Warszawa, 1995.
• [4] Klimpel, A., Podręcznik spawalnictwa, Wyd. Pol. Śl., Gliwice, 2004.
• [5] Klimpel, A., Napawanie i natryskiwanie cieplne, WNT, Warszawa, 2000.
• [6] Grzelak, K,. Właściwości użytkowe stali zaworowych laserowo napawanych proszkiem stellitowym. Rozprawa Doktorska WAT, Warszawa, 2009.
• [7] Kałdoński, T., Tribologia i płyny eksploatacyjne, Wybrane problemy tribologii, WAT, Warszawa,1995.
• [8] Hebda, M., Wachal, A., Trybologia, WNT, Warszawa, 1980.
• [9] Łuczak, A., Machel, M., Mazur, T., Trybologia. Zużycie i badania trybologiczne elementów maszyn, WAT, Warszawa,1979.
• [10] Mrowec, St., Kinematyka utleniania metali, Wyd. Śląsk, 1982.