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The Effect of Temperature on the Result of Complex Modification of IN-713C Superalloy Castings

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

Archives of Foundry Engineering

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2015

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Vol. 15, iss. 4

13--16

EN

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.

2

Surface Modification of Cored, Thin Walled Castings of Nickel Superalloy IN-713C

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

Archives of Foundry Engineering

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2015

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Vol. 15, iss. 3

17--20

EN

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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The Relationship Between the Solidification Parameters and Chemical Composition of Nickel Superalloy IN-713C

Binczyk F., Gradoń J., Cwajna J., Szymszal J.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 4

5--10

EN

The paper presents the results of studies on the development of correlation of solidification parameters and chemical composition of nickel superalloy IN-713C, which is used i.a. on aircraft engine turbine blades. Previous test results indicate significant differences in solidification parameters of the alloy, especially the temperatures Tliq and Tsol for each batch of ingots supplied by the manufacturer. Knowledge of such a relationship has important practical significance, because of the ability to asses and correct the temperatures of casting and heat treatment of casts on the basis of chemical composition. Using the statistical analysis it was found that the temperature of the solidification beginning Tliq is mostly influenced by the addition of carbon (similar to iron alloys). The additions of Al and Nb have smaller but still significant impact. Other alloying components do not have significant effect on Tliq. The temperature Teut is mostly affected by Ni, Ti and Nb. The temperature Tsol is not in any direct correlation with the chemical composition, which is consistent with previous research. The temperature Tsol depends primarily on the presence of non-metallic inclusions present in feed materials and introduced during the melting and casting processes.

4

The Influence of Macrostructure of Nickelbased Superalloys IN713C and MAR 247 on the Characteristics of High-temperature Creep

Cieśla M., Binczyk F., Mańka M., Findziński R.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 4

11--16

EN

The study consisted in assessing the influence of surface and volume modification on the characteristics of high-temperature creep of castings made of waste products of nickel-based superalloys IN 713C and the MAR-247. The results of high-temperature creep tests performed under conditions of two variants of research were analysed. The characteristics of creep according to variant I were obtained on the basis of earlier studies of these alloys with the parameters T=982oC, σ=150MPa [1]. Variant II included carrying out creep tests of alloy IN713C with the parameters T=760oC, σ =400MPa and alloy MAR247 with the parameters: T=982oC, σ=200MPa.Developed creep characteristics were compared with the results of these alloys with the parameters according to variant I of the study. It was observed that the conditions of experiments carried out depending upon the value of the creep test temperature and stress with the creep stability depends on the size of the macrograin (I variant of the studies) or such influence was not observed (II variant of the studies). Stability of samples with coarse structure in variant I of creep tests was significantly higher than the samples with fragmented grain. It was found that the observed stability conditions are dependent on the dominant deformation mechanisms under creep tests carried out - diffusion mechanism in variant I and a dislocation mechanism in variant II of the study. The conditions for the formation and growth of the cracks in the tested materials, including the morphological characteristics of their macro-and microstructure were tested.

5

Effect of modification on the mechanical properties of IN-713C alloy

Binczyk F., Śleziona J.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 1 spec.

195--198

EN

The results of studies on the effect of modification on macrostructure and mechanical properties (hardness, R02, Rm, elongation A5 and reduction of area Z) of IN-713C nickel alloy, examined on “carrot”- type specimens(1) were presented. One surface-volume modified melt and two volume-modified melts were made. As a reference, the results obtained on non-modified castings were used. A very beneficial effect of the combined surface-volume modification on alloy macrostructure (equiaxial crystals) and mechanical properties was reported. Volume modification produces mixed structure of columnar and equiaxial crystals. The efficiency of modification was additionally enhanced by application of filters made according to the authors’ genuine design. The inoculant used in these filters was cobalt aluminate CoAl2O4.