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1
Content available Geometry of remeltings and efficiency of the surface remelting process applied to cobalt alloy castings
Mróz M., Orłowicz W., Tupaj M.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 2
95--98
EN
The paper summarises results of measurements of remelting area geometry, thermal efficiency and melting efficiency characterising the surface remelting process applied to castings of MAR-M-509 cobalt alloy. The remelting process was carried out with the use of GTAW (Gas Tungsten Arc Welding) method in protective atmosphere of helium, at the electric current intensity in the range from 100 A to 300 A, and the electric arc scanning velocity vs in the range from 200 mm/min to 800 mm/min. The effect of current intensity and electric arc scanning velocity on geometrical parameters of remeltings, thermal efficiency, and melting efficiency characterising the remelting process has been determined.
2
Content available Stress rupture test of MAR-M509 alloy with structure refined by rapid resolidification
Mróz M., Orłowicz W., Tupaj M., Trytek A.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 4
117-120
EN
This study presents results of stress rupture test of MAR-M-509 cobalt alloy samples, as-cast and after surface refining with a concentrated stream of heat. Tests were conducted on samples of MAR-M-509 alloy castings, obtained using the lost-wax method. Casting structure refining was performed with the GTAW method in argon atmosphere, using the current I = 200 A and electrical arc scanning velocity vs = 100, 150, 200 and 250 mm/min. The effect of rapid resolidification of the MAR-M-509 alloy on the microstructure was examined and significant improvement in stress rupture test was observed.
3
Content available remote Fatigue strength of MAR-M509 alloy with structure refined by rapid crystallization
Mróz M., Orłowicz W., Tupaj M., Trytek A.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 3
119--122
EN
This study presents test results of high-cycle (N>2⋅107) fatigue bending strength of MAR-M-509 cobalt alloy samples, as cast and after surface refining with a concentrated stream of heat. Tests were conducted on samples of MAR-M59 alloy casts, obtained using the lostwax method. Cast structure refining was performed with the GTAW method in argon atmosphere, using the current I = 200 A and electrical arc scanning velocity vs = 250 mm/min. The effect of rapid crystallization occurring after the fusion process is refinement of the MAR-M509 alloy cast microstructure and significant improvement in bending fatigue strength.
4
Content available remote Evaluation of fractures in MAR-M509 alloy samples after fatigue strength tests
Mróz M., Orłowicz W., Tupaj M.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 3
115--118
EN
The paper presents the result of fracture analysis in MAR-M509 samples after high-cycle bending fatigue strength tests. Microstructural tests were carried out with a scanning electron microscope. To identify carbide phases a quantitative analysis of the chemical composition was made. The fracture surface and the surface in a plane perpendicular to the fracture surface were observed. It was discovered that the crack initiation and propagation occurs on carbide separations.
5
Ilościowa ocena wielkości i kształtu ziaren pierwotnych w odlewanych precyzyjnie elementach z nadstopu kobaltu MAR-M509
Adamiec J., Szczotok A., Cwajna J.
Inżynieria Materiałowa
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2006
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Vol. 27, nr 3
108-111
PL
W artykule przedstawiono rezultaty prac badawczych nad makrostrukturą powierzchni roboczej (rys. 1, 3a, 4a) oraz makrostrukturą przekroju poprzecznego (rys. 2, 3b, 4b) żaroodpornego komponentu wykonanego ze stopu MAR-M509. Opisano kolejne etapy postępowania mającego na celu wyznaczenie parametrów charakteryzujących ziarno w przypadku obu rodzajów badanych powierzchni. Efektem tych działań jest opracowanie kompleksowej i powtarzalnej procedury oceny ilościowej ziaren pierwotnych badanego komponentu. Ponadto procedura ta może stać sie punktem wyjścia przy próbach stworzenia podobnych procedur w odniesieniu do innych materiałów i innych komponentów.
EN
The paper has presented results of researches on work surface macrostructure (Fig. 1, 3a, 4a) and transverse cross section macrostructure (Fig. 2, 3b, 4b) of a heat-resistant component made of MAR-M509 alloy. Consecutive stages of procedure being aimed at determination of parameters characterizing grain in the case of both kinds of the analyzed surfaces were described. An effect of these activities was elaboration of a complex and repeatable procedure of quantitative description of the analyzed component’s primary grains. Moreover, the procedure could become a point of reference for trials of creating similar procedures for other materials and components.
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