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Simulační výpočty tuhnutí odlitků ze slitiny ZnAl4 v ocelové formě

100%

Krýslová S. , Nová I. , Nováková I.

Archiwum Odlewnictwa

2006

tom R. 6, nr 18/1

387--392

Článek se zabývá simulací proudění taveniny, určením solidifikačních časů a tuhnutím odlitků slitiny zinku (ZnAl4) odlévaných vysokotlakým litím do kovové formy z oceli ČSN 19 552. Pro stanovení hodnot tepelně-fyzikálních veličin materiálu odlitku a formy byly provedeny jednoduché experimenty odlévání slitiny ZnAl4 do kovové formy. Získané časové závislosti teplot byly též nasimulovány. Na základě shody simulace a experimentu byly stanoveny potřebné hodnoty pro simulaci tlakového lití slitiny ZnAl4.

This article deals with the melt flowing simulation, time of the solidification of the casting zinc alloys (ZnAl4) pressure die-castings into the metal moulds of steel ČSN 19 552. There were made the simple experiments by the casting alloys ZnAl4 to the metal mould for the determination valuations of the thermal-physical quantities of the casting material and mould. Time dependencies of the temperature were also simulated. On the basis of the simulation and experiment conformity there were determined valuations for pressure die-casting simulation of the zinc alloy ZnAl4.

Destruction Mechanism of Z10400 Zn-based Alloy Subjected to Cavitational Erosion

100%

Jasionowski R. , Zasada D. , Polkowski W.

tom Vol. 13, iss. 2 spec.

48--52

Z10400 zinc-based alloy has a very good casting properties and high resistance to corrosion. These two advantages make that Z10400 zinc-based alloy is commonly used for cathodic protection of hulls of ships. Cathodic anodes made of Z10400 zinc-based alloy in the propeller and flap rudder areas are also additionally exposed to the cavitation erosion. The aim of this work was to determine the cavitation erosion resistance of Z10400 zinc-based alloy, which is applied as protectors in cathodic protection of hulls of ships. The examination of cavitational erosion was carried out on a jet-impact measuring device. Study of the mechanism of the destruction of Z10400 alloy based on analysis was performed with scanning electron microscope Quanta 3d FEG and electron back scattered diffraction (EBSD) method.