Investigation of casting–ceramic shell mold interface thermal resistance during solidification process of nickel based superalloy

Szeliga, Dariusz; Kubiak, Krzysztof; Ziaja, W.; Cygan, Rafał; Suchy, J. S.; Burbelko, A.; Nowak, W.; Sieniawski, Jan

doi:10.1016/j.expthermflusci.2017.04.024

Cited by 30 publications

(3 citation statements)

References 28 publications

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“…The layers are usually made from the following basic ingredients: binder, refractory filler, additives (e.g., for stabilizing pH) and stucco powders. In the forming process, binders perform particularly important functions, which include: ensuring appropriate strength before firing, regulating the properties of slurries and preventing the sedimentation of solid particles ( Ref 10,11). The dimensional changes of the molds during dewaxing, melt pouring and solidifying strongly depend on the green strength and elevated temperature strength.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Shell Mold Composition on the As-cast Macro- and Micro-structure of Thin-Walled IN713C Superalloy Castings

Rakoczy

Grudzień-Rakoczy

Cygan

2019

J. of Materi Eng and Perform

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In the investment casting process, the building of ceramic layers around the wax pattern is the main timeconsuming stage. Increasing their number ensures sufficient mechanical properties, but also lengthens the whole process, including drying time and preheating of the mold. Four molds for casting Ni-based superalloy IN713C were strengthened by glass fibers, included in the slurry, and metal powder, of Al, Cu, Fe or Ni, in the coverage. Castings were subjected to microstructural investigations in order to find out if the new design can be promising for the manufacture of jet engine components. Bend tests revealed that the green strengths of all new molds were higher, at least 3.65 MPa, than that of the unmodified molds, 3.0 MPa. Optical microscopy revealed that the composition of a mold had a strong influence on stereological parameters of equiaxed IN713C grains. Microstructural observation and hardness measurements of castings revealed differences in the volume fraction of strengthening phases, porosity and hardness. The microstructure due to the complex chemical composition of IN713C consisted of several phases including ternary eutectics as a consequence of L fi c + Ni 7 Zr 2 + (Nb, Zr)C. Keywords aviation, glass fibers, investment casting, metal powder, shell mold This article is an invited submission to JMEP selected from presentations at the 73rd World Foundry Congress and has been expanded from the original presentation. 73WFC was held in Krakow, Poland, September 23-27, 2018, and was organized by the World Foundry Organization and Polish FoundrymenÕs Association.

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Section: Introductionmentioning

confidence: 99%

The Influence of Shell Mold Composition on the As-cast Macro- and Micro-structure of Thin-Walled IN713C Superalloy Castings

Rakoczy

Grudzień-Rakoczy

Cygan

2019

J. of Materi Eng and Perform

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“…It is used to test the consistency of the molding mixture and helps to assess the time needed to properly dry the layer applied to the wax model. The quality of the primary coating of the shell mold determines the quality of the casting surface [12,13]. In addition, the molds should allow easy punching of the casting after the casting process [14].…”

Section: Introductionmentioning

confidence: 99%

Investigations of Model Multilayer Ceramic Casting Molds in a Raw State by Nondestructive Methods

et al. 2021

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This article presents the results of research on the use of modern nondestructive methods such as 3D scanning, thermography and computed tomography (CT) to assess the quality of multilayer ceramic molds. Tests were performed on spherical samples of multilayer ceramic molds in the raw state. Samples were made of molding sands composed of quartz and molochite powders, the alcoholic binder hydrolyzed ethyl silicate (ZKE) and an aqueous binder based on colloidal silica. Thickness measurements of spherical forms were made using a 3D scanner. Porosity measurements were made using CT. Additionally, thermography observations of the mold cooling process were made with controlled temperature and humidity. The results of temperature measurements of samples were compared with measurements of thickness and porosity. The practical goal was to determine the possibility of using thermography, 3D scanning and CT as a quick method for detecting mold defects by varying their thickness, porosity and cracks and for final verification of the ceramic molds’ condition before casting.

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“…In the case of refractory metals and alloys, the selection of materials for casting moulds is limited to oxides and high melting compounds characterised by low reactivity at high temperature. This is a decisive parameter due to the intensification of diffusion processes at the liquid metal/mould interface [16][17][18][19]. The use of moulding mixtures that react with liquid metal will cause the adhesion of the metal to the substrate, resulting in the manufacture of cast product with low surface quality [20,21].…”

Section: Introductionmentioning

confidence: 99%

Microstructure of the oxide ceramics/Inconel 713C interface

Hotloś

Boczkal

Nawrocki

et al. 2019

Materials Science and Technology

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Nickel-based refractory alloys are used in the aerospace industry as materials for the production of engine turbine blades obtained by the casting method. Both casting process and surface quality of the ceramic mould have a significant influence on product properties. Current research involved the investigation of interactions between oxide ceramics, forming the basic material of casting moulds and crystallisers, and Inconel 713C nickel superalloy. The wettability of ceramics by Inconel 713C was tested for the three types of materials at temperatures commonly used in the directional casting of this alloy. The oxide ceramics/Inconel 713C interfaces were examined by SEM to reveal the microstructure of phase boundary and assess the degree of degradation of the casting mould ceramic coating.

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Investigation of casting–ceramic shell mold interface thermal resistance during solidification process of nickel based superalloy

Cited by 30 publications

References 28 publications

The Influence of Shell Mold Composition on the As-cast Macro- and Micro-structure of Thin-Walled IN713C Superalloy Castings

The Influence of Shell Mold Composition on the As-cast Macro- and Micro-structure of Thin-Walled IN713C Superalloy Castings

Investigations of Model Multilayer Ceramic Casting Molds in a Raw State by Nondestructive Methods

Microstructure of the oxide ceramics/Inconel 713C interface

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