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1
Content available Stress-rupture Tests of MAR-M-509 Cobalt Alloy Improved by Rapid Solidification
Mróz M., Orłowicz W., Tupaj M.
Archives of Foundry Engineering
|
2013
|
Vol. 13, iss. 1 spec.
117--120
EN
In the paper, results of stress-rupture test applied to MAR-M-509 cobalt alloy specimens, in as-cast condition and with microstructure shaped under rapid solidification conditions are presented. The material for the study were castings of MAR-M509 alloy obtained by means of the investment casting method. The rapid solidification conditions were obtained by means of remelting process carried out with the use of GTAW method. The effect of rapid solidification following the remelting process is a refinement of microstructure in castings of MAR-M509 alloy and significant extension of the time to rupture in stress-rupture test.
2
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
|
2013
|
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.
3
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
|
2012
|
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.
4
Content available Examination of cast iron material properties by means of the nanoindentation method
Trytek A., Orłowicz W., Tupaj M., Mróz M.
Archives of Foundry Engineering
|
2012
|
Vol. 12, iss. 4
141-144
EN
The paper presents results of examination of material parameters of cast iron with structure obtained under rapid resolidification conditions carried out by means of the nanoindentation method.
5
Content available Examination of Cast Iron Material Properties by Means of the Scratch Method
Trytek A., Orłowicz W., Mróz M., Tupaj M.
Archives of Foundry Engineering
|
2012
|
Vol. 12, iss. 2s
75--80
EN
The paper presents results of examination of unalloyed cast iron with diversified structure of the metallic matrix carried out by means of the scratch method. The research work was carried out with cast sample plates and with castings superficially remelted by means of the Gas Tungsten Arc Welding (GTAW) method. The test was carried out with load force of 5 N. Parameters such as the coefficient of friction, penetration depth, and acoustic emission were analysed.
6
Content available remote Influence of the microstructure of cast iron on the rheological properties of frictional contact and wear-resistance
Shevelya V., Orłowicz W., Trytek A., Kirilkov V.
Archives of Foundry Engineering
|
2010
|
Vol. 10, iss. 1 spec.
273--278
EN
The influence of sliding speed and contact load on wear-resistance of cast iron in the unhardened state (cast without heat treatment) and in the state after surface hardening by electroarc plasma (GTAW method) is investigated. This method provides formation of composite hardening structure in the process of fast crystallization. It is shown, that during friction of hardened cast iron the contribution of mechanical-thermal hardening with simultaneous development of relaxation processes prevails over mechanical peening. It provides high level and stability of wear-resistance.
7
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
|
2010
|
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.
8
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
|
2010
|
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.
9
Content available remote Ultrasonic assessment of shape index and number of graphite precipitations in spheroidal cast iron manufactured in the foundry METAL-ODLEW Sp.J.
Orłowicz W., Tupaj M., Mróz M., Guzik E., Nykiel J., Zając A., Piotrowski B.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 4
179-182
EN
This study presents the results of testing the shape index, number of graphite precipitations, and longitudinal ultrasound wave velocity with wedge castings used for production of samples for the assessment of mechanical characteristics. To differentiate values of the parameters, the castings were made at the same time as the production castings. The data obtained were used to establish the relationship between the ultrasonic wave velocity cL, the shape index SS and the number of graphite precipitation NA.
10
Content available remote Influence of wall thickness of spheroidal cast iron, manufactured in the foundry METAL-ODLEW Sp.J., on its graphite shape index and ultrasonic control index
Orłowicz W., Tupaj M., Mróz M., Guzik E., Nykiel J., Zając A., Piotrowski B.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 4
173-178
EN
This work presents the results of ultrasonic evaluation of the microstructure of spheroidal cast iron manufactured under production conditions at the foundry of Metal Odlew Sp.J. Evaluation of ultrasonic control index sensitiveness to changes of graphite shape index Ss of spheroidal cast iron (type 500-7), utilized modelled stepped castings. The relationship was determined between the shape index of graphite precipitation Ss and the velocity of longitudinal ultrasonic wave cL.
11
Content available remote Influence of spheroidal cast iron wall thickness on its microstructure and ultrasonic control index
Orłowicz W., Tupaj M., Mróz M., Guzik E., Gierut E., Pilut W., Zimowski A.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 1
125-128
EN
This work presents results of ultrasonic evaluation of the microstructure of spheroidal cast iron manufactured under production conditions. Evaluation of the ultrasonic control index's sensitiveness to changes in microstructure (graphite shape index Ss and average number of graphite precipitations NA) of cast iron, was made on modelled stepped castings. A relation between the graphite precipitation shape index Ss and the velocity of longitudinal ultrasonic wave cL has been defined, as well as a relation between the average number of graphite precipitations NA and the velocity of longitudinal ultrasonic wave cL.
12
Content available remote Influence of graphite precipitation shape and number on tensile strength of spheroidal cast iron manufactured in the foundry METAL-ODLEW Sp.J.
Orłowicz W., Tupaj M., Mróz M., Guzik E., Nykiel J., Zając A., Piotrowski B.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 4
169-172
EN
The study assesses influence of graphite precipitation shape and number on tensile strength of spheroidal cast iron manufactured under production conditions.
13
Content available remote Friction wear cast iron casting surface hardened by concentrated source of heat
Orłowicz W., Trytek A.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 2
189-192
EN
In this study surface fusion by the GTAW (in argon atmosphere) surfacing process on plate of cast iron with electric arc advance speeds from 200 to 800 mm/min and current range I=300A were performed. The geometry, microstructure, hardness, friction wear intensity were measured. A stepwise regression method was used to develop relationships between the electric arc advance speed, parameters of fusion geometry, microhardness and friction wear intensity.
14
Content available remote Effect of the concentrated heat flow treatment on the structure and the antiwear properties of cast iron
Orłowicz W., Shevelya V., Trytek A., Kirilkov V.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 2
185-188
EN
The influence of modes of surface fusion by electric arc plasma (GTAW method) on the hardness and wear-resistance of plain cast iron was studied. A possible mechanism of structural rearrangement in the processed material during the friction was analyzed. This mechanism is determined by specific behaviour of hardened martensitic structure under dynamic load. This martensitic structure forms a metal basis of cementite eutectic under conditions of fast crystallisation.
15
Content available remote Defining the relation between tensile strength and ultrasonic wave velocity in spheroidal cast iron manufactured in the foundry JAFAR S.A.
Orłowicz W., Tupaj M., Mróz M., Guzik E., Gierut E., Pilut W., Zimowski A.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 1
129-132
EN
This work presents results of ultrasonic evaluation of mechanical properties of spheroidal cast iron manufactured under the production conditions of FA JAFAR S.A.. Tests were conducted on wedge casts which were used as samples for tensile strength tests, a map of distribution of longitudinal ultrasound wave velocity was determined for the cast wedges. The tensile strength tests were conducted and values of longitudinal ultrasound wave velocity were determined in the place where the sample was broken. Relations between the tensile strength and the velocity of longitudinal ultrasonic wave cL were determined.
16
Content available remote Defining the relation between mechanical properties and ultrasonic wave velocity in spheroidal cast iron manufactured in the foundry Metal-Odlew s.c.
Orłowicz W., Tupaj M., Mróz M., Guzik E., Nykiel J., Zając A., Piotrowski S.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 1
121-124
EN
This work presents results of ultrasonic evaluation of mechanical properties of spheroidal cast iron manufactured under the production conditions of Metal-Odlew s.c. Tests were conducted on wedge casts which were used as samples for tensile tests, a map of distribution of longitudinal ultrasound wave velocity was determined for the cast wedges. The tensile tests were conducted and values of longitudinal ultrasound wave velocity were determined in the place where the sample was broken. Relations between the mechanical properties and the velocity of longitudinal ultrasonic wave cL were determined.
17
Content available remote Assessment of the influence of magnesium content on the shape and amount of graphite precipitation in spheroidal cast iron manufactured by Metal-Odlew s.c.
Orłowicz W., Tupaj M., Mróz M., Guzik E., Nykiel J., Zając A., Piotrowski S.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 1
117-120
EN
The study presents the influence of time on cast iron spheroidisation, modification of the magnesium content in the alloy, and the influence of the magnesium content on the shape and number of graphite precipitations. For one particular set of production conditions, it was observed that 17 minutes after completing the modification and spheroidisation procedure, the magnesium content had decreased from 0.070% to 0.040%. This resulted in a decrease in the graphite precipitation shape index Ss from 0.081 to 0.067, as well as a decrease in the average number of graphite precipitations NA from 568 mm-2 to 305 mm-2.
18
Content available remote Wpływ parametru strukturalnego ═D dendrytów fazy α na intensywność zużycia ściernego odlewów ze stopu C355 uszlachetnionych skoncentrowanym strumieniem ciepła
Mróz M., Orłowicz W., Tupaj M.
Tribologia
|
2008
|
nr 1
101-109
PL
W pracy przedstawiono wyniki badań wpływu szybkiej krystalizacji realizowanej z wykorzystaniem metody GTAW na mikrostrukturę i właściwości użytkowe odlewu ze stopu C355. Materiał do badań stanowiły próbki odlane do formy metalowej, które uszlachetniono powierzchniowo z zastosowaniem różnych wartości parametrów technologicznych metody GTAW. Określono związek pomiędzy parametrem strukturalnym ═D a intensywnością zużycia ściernego.
EN
The results of the effect of rapid solidification, realized with GTAW method, on the structure and properties of C355 alloy was presented in the paper. The sample was prepared in the permanent mould and refined surface with variable parameters of GTAW process (welding current, arc advance speed). The correlation were applied in order to the relation between the structure parameters and wear intensity.
19
Content available remote Wpływ mikrostruktury żeliwa na jego zużycie ścierne
Orłowicz W., Tupaj M., Mróz M.
Tribologia
|
2008
|
nr 1
111-119
PL
W poszukiwaniu taniego stopu odlewniczego odpornego na zużycie ścierne wykonano badania zużycia żeliwa szarego o różnej wielkości wydzieleń grafitu i różnej osnowie oraz badania żeliwa sferoidalnego o różnej osnowie. Analizowano mechanizm zużycia z zastosowaniem metody metalograficznej.
EN
In search of cheap wear resistant casting alloy wear testing of grey cast iron with different size of graphite precipitations and different matrices and wear testing of ductile cast iron with different matrices have been carried out. Wear mechanism using metallographic method was analyzed.
20
Content available remote Intensywność zużycia ściernego żeliwnych odlewów uszlachetnionych powierzchniowo
Orłowicz W., Trytek A.
Tribologia
|
2008
|
nr 1
121-128
PL
W pracy oceniono intensywność zużycia ściernego odlewów z żeliwa sferoidalnego uszlachetnionego powierzchniowo techniką nadtapiania. Opracowano związek pomiędzy parametrami procesu technologicznego (natężeniem prądu, prędkości skanowania łukiem elektrycznym) a twardością oraz pomiędzy intensywnością zużycia ściernego a twardością.
EN
The paper pursued the objective of determining relationships between GTAW process parameters and microhardness of fused zone have been developed and presented. The relationship formulas HV0,1 = f(I, vs) and Zi = f(HV0,1), are defined.
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