Mikrostruktura kompozytowych powłok Ni-ZrC napawanych plazmowo
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Abstract
W artykule przedstawiono wyniki badań kompozytowych napoin o osnowie stopu Ni umacnianych cząstkami ZrC. Warstwy te uzyskano poprzez napawanie plazmowe mieszaniny proszków osnowy i fazy umacniającej na podłoża ze stali S355J0. Wykonano napoiny dla zmiennych wartości natężenia prądu łuku głównego. Przeprowadzono badania makro i mikroskopowe powłok kompozytowych stosując mikroskopię optyczną i skaningową. Określono objętościowy udział cząstek fazy umacniającej osnowę oraz stopień rozcieńczania napoiny metalem podłoża. Analizowano rozkład mikrotwardości osnowy. Wykazano, iż zachodzi dezintegracja cząstek proszku ZrC w skutek oddziaływania z ciekłą osnową metaliczną.
The microstructure of Ni-ZrC composite coatings deposited by plasma method
The results of investigations of nickel base composite coatings reinforced by ZrC particles are presented in the paper. The layers were obtained by deposition of Ni-alloy and ZrC powders mixture onto S355J0 low alloy steel by Plasma Powder Transferred Arc Welding method. Variable values of main welding current were applied. Macroscopic and microscope examinations of composite coatings were evaluated using optical and scanning microscopes. Volume fraction of reinforcing phase and dilution coefficient were evaluated. Microhardness of the matrix of composite coatings was also analyzed. It was evidenced that disintegration of ZrC particles occurred due to the action with liquid metal base.
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