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1
Content available Tribological properties of the Fe-Al intermetallic alloys after annealing
Garbala K., Patejuk A.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 2 spec.
43--46
EN
In paper researching results of tribological proprieties Fe3Al intermetallic alloys after annealing are presented. Studies were conducted in the following environments: a water; an air and oil. For investigation purposes the tribotester pin-on-disk type with the contrsample made of steel 40H quenched and tempered was used. Tests were carried out with the following process parameters: pressure p = 2MPa and linear velocity (circuital) V = 0.46m/s. It was noted, that intermetallic samples with the small distinction in chemical compositions, annealed at different temperatures showed a large difference in the quantity of material loss in the all tested environments. Appropriately selected parameters of the intermetallic alloys annealing, provide their greater resistance to abrasion in the air and oil environments than in the case of steel.
2
Content available The method for determination of the beginning of cavitational wear through comparison of mass decrement and destroyed surface increment on the example of FeAl36 alloy
Jasionowski R., Przetakiewicz W., Zasada D.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 2 spec.
103--107
EN
Cavitational erosion is the phenomenon of mechanical destruction of a material due to the implosion of cavitational bubbles. Cavitational resistance is the ability of material to oppose the effect of cavitation being determined most frequently by analysing the kinetics of destruction of a material being examined on a given device. Materials with the highest resistance to cavitational destruction are characterised by the longest incubation period and smaller destruction rate. The carried out laboratory tests of resistance to cavitational erosion showed that determination of the beginning of cavitational wear is very difficult because the kinetics of cavitational destruction depends on: test bed type, tested material and test time. The aim of presented study was to propose a method for determination of the beginning of cavitational wear through comparison of mass decrement and destroyed area increment curves on the example of FeAl36 intermetallic alloy subjected to the cavitational wear on a flux-impact test stand.
3
Content available The effect of structure on the cavitational wear of FeAl intermetallic phase-based alloys with cubic lattice
Jasionowski R., Przetakiewicz W., Zasada D.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 2 spec.
97--102
EN
The process of cavitational erosion induces destruction of a material which consists of plastic strains, mass decrements, phase changes, grain fragmentation and surface micro- and macro-geometry changes. Heterogeneity of this process causes the destruction of a solid body due to cavitation to be hard to predict. Examinations of many materials showed that the course of cavitation wear is basically affected by structure which allows for orientation and size of grains and their shape, fraction of small and large angle boundaries, type of phases (in multi-phase materials), interposition of their grains, grain volume fraction as well as distribution of impurities and possible defects of materials, such as cracks, pores and non-metallic inclusions. The aim of this study was to examine the effect of structure on the cavitational wear of FeAl intermetallic phase-based alloys with cubic lattice.
4
Content available remote The cavitational erosion resistance of the B2-type Fe-Al casting alloys
Jasionowski R., Przetakiewicz W., Zasada D.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1 spec.
305--310
EN
The problem of the destruction of turbo-machinery components is very complex, because it consists of processes of erosion and corrosion. The most dangerous factor is the cavitation phenomenon, which is very difficult to eliminate through the use of design solutions. It causes deterioration of the operating characteristics of machinery and equipment, such as water turbines, steam turbines, centrifugal pumps, screw vessels, cylinder liners with water-cooled engines, acoustic probe. The most commonly used method of limiting the destruction of cavitation phenomenon is the optimum choice of parameters of geometric and hydraulic machines, the appropriate design of elements and streamlined flow and providing working conditions of flow devices. The above-mentioned methods by design, the size of flow devices are limited, so better action to prevent the flow of erosion may use the material for greater resistance to erosion and cavitation corrosion is the alloy of intermetallic FeAl phase, which production costs are low compared to cast steel and cast iron alloy based on chromium and nickel. The paper presents results of an investigation carried out for cavitational resistance of the B2-type Fe-Al casting alloys using a flux-impact measuring device. The intermetallic FeAl alloys proved to have good resistance to this type of erosion in comparison to other construction materials, investigated by flux-impact device.
5
Content available Badanie mechanizmu inicjowania procesu erozji kawitacyjnej wybranych stopów na osnowie fazy międzymetalicznej Ni3Al
Zasada D., Bojar Z., Jasionowski R.
Problemy Eksploatacji
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2006
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nr 1
241-248
PL
W pracy przedstawiono wyniki badań zużycia kawitacyjnego, w okresie inkubacji, wybranych stopów na bazie fazy międzymetalicznej Ni3Al z dodatkami stopowymi boru, cyrkonu, chromu, molibdenu i żelaza. Badania prowadzono na materiale w stanie po odlewaniu oraz po procesie homogenizacji w temperaturze 1200°C. Stwierdzono podobny charakter inicjowania zużycia kawitacyjnego w postaci mikropęknięć i lokalnych ubytków zarówno w stanie po odlewaniu, jak i po homogenizacji.
EN
In the paper the results of research on initial stage - incubation period of a cavitation wear in the intermetallic Ni3Al alloys with boron, zirconium, chromium, molybdenum and iron are presented. Investigations were carried out both for as-cast and materials after homogenisation treatment at the temperature 1200°C. Initiation of the cavitation consumption in material as microcracking and local dents had similar character after casting as well as homogenization.
6
Content available remote Odporność korozyjno-kawitacyjna składników fazowych brązów manganowo-aluminiowych
Chmiel J., Jasionowski R., Przetakiewicz W.
Problemy Eksploatacji
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2003
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nr 4
19-28
PL
Przedstawiono wyniki badań odporności kawitacyjnej i korozyjno--kawitacyjnej stopów intermetalicznych z układów Fe-Al. i Cu-Mn-Al. Skład badanych stopów odpowiada składom składników fazowych, występujących w wieloskładnikowych brązach manganowo-aluminiowych. Analizowano przebieg niszczenia korozyjno-kawitacyjnego tych stopów. Oceniono przydatność stopów intermetalicznych jako materiałów modelowych do badania zużycia korozyjno-kawitacyjnego.
EN
In the paper were presented research result of cavitational and corrosive -cavitational reliability of intermetallic alloys Fe-Al and Cu-Mn-Al. The composition of tested alloys corresponds to phase components existing in the multi-component Cu-Al-Mn bronzes. An investigation of corrosive-cavitational destruction of these alloys was performed. The possibility of application of intermetallic alloys as model material in research of corrosive and cavitational destruction was estimated.
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