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1
Content available Repair of Precision Castings Made of the Inconel 713C Alloy
Łyczkowska K., Adamiec J.
Archives of Foundry Engineering
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2017
|
Vol. 17, iss. 3
210--216
EN
Inconel 713C precision castings are used as aircraft engine components exposed to high temperatures and the aggressive exhaust gas environment. Industrial experience has shown that precision-cast components of such complexity contain casting defects like microshrinkage, porosity, and cracks. This necessitates the development of repair technologies for castings of this type. This paper presents the results of metallographic examinations of melted areas and clad welds on the Inconel 713C nickel-based superalloy, made by TIG, plasma arc, and laser. The cladding process was carried out on model test plates in order to determine the technological and material-related problems connected with the weldability of Inconel 713C. The studies included analyses of the macro- and microstructure of the clad welds, the base materials, and the heat-affected zones. The results of the structural analyses of the clad welds indicate that Inconel 713C should be classified as a low-weldability material. In the clad welds made by laser, cracks were identified mainly in the heat-affected zone and at the melted zone interface, crystals were formed on partially-melted grains. Cracks of this type were not identified in the clad welds made using the plasma-arc method. It has been concluded that due to the possibility of manual cladding and the absence of welding imperfections, the technology having the greatest potential for application is plasma-arc cladding.
2
Content available Shape Accuracy of Iron Precision Castings in Terms of Ceramic Moulds Physical Properties Anisotropy
Biernacki R., Haratym R., Tomasik J., Kwapisz J.
Archives of Foundry Engineering
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2014
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Vol. 14, iss. 1
5--8
EN
While analyzing shape accuracy of ferroalloy precision castings in terms of ceramic moulds physical anisotropy, low-alloy steel castings ("cover") and cast iron ("plate") were included. The basic parameters in addition to the product linear shape accuracy are flatness deviations, especially due to the expanded flat surface which is cast plate. For mentioned castings surface micro-geometry analysis was also carried, favoring surface load capacity tp50 for Rmax = 50%. Surface load capacity tp50 obtained for the cast cover was compared with machined product, and casting plate surface was compared with wear part of the conveyor belt. The results were referred to anisotropy of ceramic moulds physical properties, which was evaluated by studying ceramic moulds samples in computer tomography equipment Metrotom 800.
3
Content available remote Plasma furnace for smelting and casting metal up to 3000 K
Zitnansky M., Demian S., Caplovic L., Rehak L., Dorschfeld R.
Archives of Materials Science and Engineering
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2010
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Vol. 44, nr 2
112-119
EN
Purpose: The aim of our investigation was a development of plasma furnace for preparing castings of titanium alloy Ti64 ELI by remolding in laboratory at our research workplace. The reason of this paper writing was publishing of innovative information to the technical society. Design/methodology/approach: The objectives were achieved by solution of much research and development works in the very long time interval. The main methods used for our research was study of physic-chemical interaction between a liquid metal and surrounding atmosphere. The approach to the topic of our research was the elimination of interactions between the C, O, N and H and Ti, Al, V, Y, Zr in liquid metal. Contemporary we have solved also the acute ceramic mould for casting of perfect castings from metal of very high affinity to C, O, N and H. The main subject scope of the paper is assignee of very clean materials and much application from that. We are oriented particularly on the preparing parts of cementless total hip joint replacement (THR) and instruments for implantation. Findings: We have created the new original design of the plasma furnace for smelting and castings of high reaction of metal up to 3000 K. temperature. The main conclusion of our result was a practical using for research on very high level and for production of metal and castings from special metal in the final shape. Practical implications: It has been found that the quality of castings from Ti and Nb alloys is very good. The quality of casting was tested by metallographic analysis and by notch specimens. We have been finding out that the mass of casting can be approximately 1.00 kg. This is true statement in the first approximation if the new plasma furnace is arranged as smelting - cleaning - casting system. If the new plasma furnace is arranged as continual smelting system, than we can obtain ingot with the mass two or more kilograms. Originality/value: The design of new plasma furnace is original and also the castings from Ti, Ta and Nb alloys are in our laboratory original resultants and the metallographic analysis as well. In the case, when the castings with a good biocompatibility plays important role, this new plasma furnace can be very useful for preparing implants for body skeleton and spatial casting of material of very high affinity to elements as C, O, H, and N.
4
Content available remote Performance tests of an abrasive cut-off systems for the finishing of high-precision casts
Fedoryszyn A., Meksa W. T., Woźnicki G.
Archives of Foundry Engineering
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2008
|
Vol. 8, iss. 3
205-208
EN
The paper summarizes the performance data of a newly designed and engineered grinding and cut-off system. The machine is used for separation of models manufactured by the investment casting method. The machine comprises the following units: - base supporting other assemblies and elements: abrasive disc holder and drives; this solution enables an easy replacement and access to holding elements while a belt transmission allows the disc rpm to be varied, - mechanism moving the spindle in the horizontal, hence the abrasive disc position with respect to the batch can be precisely controlled, depending on the cast position and their shape, - holding and positioning-control of the batch to enable the fore and aft movements and rotations, - guide systems ensuring the travel of the batch in the specified direction and adjusting the travel speed to the required cutting rate, - centering, control, exhaust system, housing. Extensive tests were performed, including the tests of operating parameters of abrasive discs depending on the cast material, cyclograms of the applied treatment are obtained accordingly.
PL
[ten sam artykuł został opracowany na podst. AFE 2008 nr 2, s. 33-36]
5
Content available remote Performance tests of an abrasive cut-off systems for the finishing of high-precision casts
Fedoryszyn A., Meksa W. T., Woźnicki G.
Archives of Foundry Engineering
|
2008
|
Vol. 8, iss. 2
33-36
EN
The paper summarizes the performance data of a newly designed and engineered grinding and cut-off system. The machine is used for separation of models manufactured by the investment casting method. The machine comprises the following units: - base supporting other assemblies and elements: abrasive disc holder and drives; this solution enables an easy replacement and access to holding elements while a belt transmission allows the disc rpm to be varied, - mechanism moving the spindle in the horizontal, hence the abrasive disc position with respect to the batch can be precisely controlled, depending on the cast position and their shape, - holding and positioning-control of the batch to enable the fore and aft movements and rotations, - guide systems ensuring the travel of the batch in the specified direction and adjusting the travel speed to the required cutting rate, - centering, control, exhaust system, housing Extensive tests were performed, including the tests of operating parameters of abrasive discs depending on the cast material, cyclograms of the applied treatment are obtained accordingly.
6
Content available remote Dilatometric studies of plaster sandmix in raw and heat treated state
Pawlak M., Niedźwiedzki Z.
Archives of Foundry Engineering
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2008
|
Vol. 8, iss. 3
145-148
EN
Results of dilatometric studies of bounded plaster sandmix applied in precision pressure below atmospheric casting, are presented in this paper. Sandmix composed of half-hydrate alpha-CaSO4ź2H2O with different parts of silica SiO2 was a subject of investigations. Silica is a factor weakening the influence of phase transformations on total distortion of the mould during heating and thus influences the accuracy of prepared cast. Experimental moulders of dimensions 735 made of plaster sandmix with silica fraction equal 30; 40; 50; 60 and 70% were used during studies. Sandmix was tested in raw state and after heat treatment changing the alpha-half hydrate into anhydrite II (CaSO4). It was demonstrated that addition of the silica at level about 50% influences most advantageously on dimension changes of heated sandmix by lowering dilatations 3 times in comparison with sandmix composed of pure alpha-half hydrate. The transformation of plaster structure into anhydrite II is also important - the shrinkability phase disappears and expansion similar to linear-like appears. It was determined that it is possible to obtain sandmix of small, stabile distortion on the way of appropriate selection of components and heat treatment parameters what improves dimensional and shape accuracy limits of the cast and significantly limits internal stresses in the mould eliminating risk of its cracking.
7
Content available remote Komputerowe planowanie produkcji odlewów precyzyjnych systemem ERP
Władysiak R.
Archiwum Odlewnictwa
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2005
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R. 5, nr 17
465--476
PL
W pracy przedstawiono wyniki badań planowania produkcji odlewów precyzyjnych metodą wytapianych modeli woskowych za pomocą komputerowego systemu klasy ERP. Pokazano przebieg wprowadzania danych elementów procesu produkcyjnego, niezbędnych do planowania zlecenia produkcyjnego, za pomocą tego systemu. Potwierdzono możliwość implementacji systemu Infor: NT w odlewni precyzyjnej.
EN
The tests results of ERP computer system production planning of precise casts with lost wax method has been presented here. It has been shown the downloading of production process data, that requisite to execute the planning of production order. It has been confirmed that there are possibilities of Infor: NT implementation in precise foundry.
8
Content available remote Próba zastosowania parametrów krzywej udzialu materialowego do opisu mikro geometrii powierzchni odlewów precyzyjnych
Tomasik J., Haratym R.
Archiwum Odlewnictwa
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2004
|
R. 4, nr 14
532-537
PL
W publikacji przedstawiono wyniki badań jakości powierzchni odlewów precyzyjnych poprzez pomiar jej mikrogeometrii z wykorzystaniem parametrów Rpk, Rk, Rvk, Mr1 i Mr2 wyznaczonych z krzywej udziału materiałowego. Uzyskane wyniki potwierdzają lepszą przydatność parametrów krzywej udziału materiałowego (krzywej Abbota) niż parametry tradycyjne (Ra, Rz) do optymalizacji procesu wytwarzania odlewów precyzyjnych.
EN
The paper presents the results of investigation of the quality of precision casting surfaces with the use of parameters Rpk, Rk, Rvk, Mr1 and Mr2 estimated based on Abbot curve. The obtained results confirm better usefulness of Abbot curve parameters compared to traditional parameters (Ra, Rz, Rmax) for the optimization of precision casting technology.
9
Content available remote Mikrostruktura od powierzchni odlewów precyzyjnych z ADI po bezpośrednim hartowaniu izotermicznym
Myszka D., Kaczorowski M.
Archiwum Odlewnictwa
|
2004
|
R. 4, nr 11/1
350--354
PL
Szczegółowe badania metalograficzne żeliwa sferoidalnego, które poddane było hartowaniu izotermicznemu bezpośrednio z formy odlewniczej (DADI), wykazały bardzo podobną mikrostrukturę rdzenia odlewu do mikrostruktury ADI otrzymanego w wyniku klasycznej obróbki cieplnej. Stwierdzono jednak, iż od powierzchni odlewu mikrostruktura ta różni się dla obu procesów. Dla DADI była to rozdrobniona, klasyczna mieszanina płytek ferrytu i austenitu (ausferryt). Dla odlewów z żeliwa sferoidalnego austenityzowanych i hartowanych izotermicznie widoczne jest natomiast powierzchniowe odwęglenie, a tym samym nieco inna morfologia warstwy wierzchniej. Stwierdzono również, że obecność mikrostruktury ausferrytycznej od powierzchni odlewu precyzyjnego wykonanego z DADI jest bardzo korzystna z punktu widzenia jego własności użytkowych. Ausferryt zapewnia bowiem odpowiednią twardość, ale również wysoką odporność na ścieranie i kruche pękanie, co ma niebagatelne znaczenie dla wyrobów wykonanych ,,na gotowo".
EN
The detailed microstructural investigation of direct austempesed ductile iron (DADI) showed very similar matrix morphology to ausferrite observed in conventional ADI. It was noticed that the surface microstructure of ADI and DADI was different. Surface of ADI was decarburized and DADI had the same as a core microstructure from the surface of investment casting. Such morphology of DADI has positive effect on its surface mechanical properties.
10
Wpływ składu chemicznego staliwa stopowego na wybrane charakterystyki naskórka odlewniczego na odlewach precyzyjnych
Wojtkun F.
Inżynieria Powierzchni
|
2003
|
Nr 3
23-27
PL
Przedstawiono wpływ Cr, Mo i V w staliwie typu Cr-Mo-V-Cu-Ni na grubość naskórka odlewniczego, jego mikrotwardość, zmiękczenie i odwęglenie w procesie wyżarzania oraz zużycie przez tarcie suche. Stwierdzono, że średnia grubość naskórka odlewniczego na tym staliwie wynosi 0,10 - 0,15 mm. Warstwa naskórkowa niekorzystnie wpływa na trwałość cieplną i zużycie tribologiczne odlewów. Ze wzrostem udziału chromu i molibdenu w staliwie grubość naskórka odlewniczego maleje, a wanad powoduje zwiększenie tej grubości.
EN
Effect of Cr, Mo and V contents in cast steel Cr-Mo-V-Cu-Ni type on casting skin thickness, microhardness softening, decarburization during annealing process and its friction wear are presented. It was found, that casting skin thickness on this cast steel averages to 0,10 - 0,15 mm. The skin layer has an unfavourable effect on thermal life and tribological wear of steel castings. With the increasing contents of chromium and molybdenum in cast steel, casting skin thickness decreases and vanadium causes an increase of this thickness.
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