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Abstract

The paper presents preliminary results of research on the use of certain smelting slags in the process of modification of casting alloys, leading to a change in the structure of these alloys and improvement of their mechanical and operational properties. The positive effect of ground copper slag with a fraction below 0.1 mm on the effect of modifying the hypoeutectic silumin AlSi7Mg towards changing the morphology of coarse-grained eutectic to fine-dispersive was demonstrated. The modifying effect also applies to the pre-eutectic α phase and results in the formation of additional crystallization sites (nucleation process), which was demonstrated by the thermal ATD solidification analysis, showing an increase in the temperature Tliq and TEmax. The positive and noticeable influence of the mixture of copper and steel slag on the surface modifying effect of fragmentation of the structure was demonstrated in casting nickel superalloy IN-713C. Based on the results of research conducted so far on the modifying effect of cobalt aluminate, a hypothetical model of the impact of reduced metallic components of the applied metallurgical slags on the nucleation process and shaping of the microstructure of nickel alloys was developed.
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Bibliography

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Authors and Affiliations

J. Sitko
1
ORCID: ORCID

  1. Silesian University of Technology, Department of Production Engineering, 26-28 Roosevelta Str., 41-800 Zabrze, Poland
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Abstract

The paper presents the results of research on the determination of the effect of pouring temperature on the macrostructure of the castings

subjected to complex (surface and volume) modification and double filtration. Tested castings were made of post-production scrap (gating

system parts) of IN-713C superalloy. Tests included the evaluation of the number of grains per 1 mm2

, mean grain surface area, shape

factor and tensile strength. Casting temperature below 1470 °C positively influenced the modification effect. The grains were finer and the

mechanical properties increased, especially for castings with thicker walls. On the other hand, manufacture of thin walled castings of high

quality require pouring temperature above 1480 °C.

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Authors and Affiliations

R. Findziński
P. Gradoń
F. Binczyk
M. Mańka
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Abstract

In current casting technology of cored, thin walled castings, the modifying coating is applied on the surface of wax pattern and, after the

removal of the wax, is transferred to inner mould surface. This way the modification leading to grain refinement occur on the surface of

the casting. In thin walled castings the modification effect can also be seen on the other (external) side of the casting. Proper reproduction

of details in thin walled castings require high pouring temperature which intensify the chemical reactions on the mould – molten metal

interface. This may lead to degradation of the surface of the castings. The core modification process is thought to circumvent this problem.

The modifying coating is applied to the surface of the core. The degradation of internal surface of the casting is less relevant. The most

important factor in this technology is “trough” modification – obtaining fine grained structure on the surface opposite to the surface

reproduced by the core.

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Authors and Affiliations

R. Findziński
P. Gradoń
F. Binczyk
M. Mańka
J. Cwajna
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Abstract

The paper presents the results concerning impact of modification (volume and surface techniques), pouring temperature and mould

temperature on stereological parameters of macrostructure in IN713C castings made using post-production scrap. The ability to adjust the

grain size is one of the main issues in the manufacturing of different nickel superalloy castings used in aircraft engines. By increasing the

grain size one can increase the mechanical properties, like diffusion creep resistance, in higher temperatures. The fine grained castings. on

the other hand, have higher mechanical properties in lower temperatures and higher resistance to thermal fatigue. The test moulds used in

this study, supplied by Pratt and Whitney Rzeszow, are ordinarily used to cast the samples for tensile stress testing. Volume modification

was carried out using the patented filter containing cobalt aluminate. The macrostructure was described using the number of grains per

mm2

, mean grain surface area and shape index. Obtained results show strong relationship between the modification technique, pouring

temperature and grain size. There was no significant impact of mould temperature on macrostructure.

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Authors and Affiliations

P. Gradoń
F. Binczyk
M. Mańka
J. Cwajna

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