The Influence of the Melt-Pouring Temperature and Inoculant Content on the Macro and Microstructure of the IN713C Ni-Based Superalloy

Matysiak, H.; Zagórska, Małgorzata; Bałkowiec, A.; Adamczyk‐Cieślak, Bogusława; Dobkowski, K.; Koralnik, Mateusz; Cygan, Rafał; Nawrocki, J.; Cwajna, Jan; Kurzydłowski, Krzysztof J.

doi:10.1007/s11837-015-1672-5

Cited by 18 publications

(13 citation statements)

References 29 publications

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“…Investment casting (IC) is an extremely important technique for such fabrication because of its ability to obtain complex geometries, dimensionally very accurate, with an excellent surface finish. Taking into account the aviation safety requirement, these complicated castings must meet all quality standards, which in this case are highly strict (Ref [7][8][9]. The various stages involved in the IC process are the creation of a disposable wax pattern, construction of several ceramic layers around the wax pattern, dewaxing and firing the mold and metal pouring into the mold under vacuum protection (Fig.…”

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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“…Generally investment casting of Ni-based superalloys is characterized by low cooling rates due to the very low thermal conductivity of shell molds. Matysiak [38] postulated that the cooling rate was around 10-12 • C/min in the temperature range 1263-650 • C, based on investment casting of Inconel 713C. The thermal conductivity of their shell mold (zircon filler, colloidal silica binder, and alumina silicate powders as a back up) was 1.09 W/(mK) at 1200 • C and 0.77 W/(mK) at 600 • C. The pouring was carried out at 1450, 1480, and 1520 • C into preheated (1200 • C) molds.…”

Section: Characterization Of Primary Microstructure By Light Microscopymentioning

confidence: 99%

“…As casting was in argon, locally the Ti-rich nitrides (Figure 8a), MgO (Figure 8b) and also oxides enriched in Ni and Cr were observed. Even in the investment castings produced in vacuum, nitrides and oxides can form [13,38]. Numerous precipitates strongly enriched in Si were also found ( Figure 8c).…”

Section: Characterization Of the Primary Microstructure Of Castingsmentioning

confidence: 99%

Fabrication and Characterization of the Newly Developed Superalloys Based on Inconel 740

et al. 2020

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The chemical composition of standard Inconel 740 superalloy was modified by changes in the Al/Ti ratio (0.7, 1.5, 3.4) and addition of Ta (2.0, 3.0, 4.0%). Remelted Inconel 740 (A0) and nine variants with various chemical compositions were fabricated by lost-wax casting. The microstructure, microsegregation, phase transformation temperatures, thermal expansion coefficients and hardness of the superalloys were investigated by scanning electron microscopy, energy dispersive X-ray spectroscopy, differential scanning calorimetry, dilatometry and Vickers measurements. Typical dendritic microstructure was revealed with microsegregation of the alloying elements. Segregation coefficient ki for Ti, Nb and Ta did not exceed unity, and so precipitates enriched mainly in these elements were found in interdendritic spaces. The Nb-rich blocky precipitates, MC carbides, MN nitrides, oxides, and fine γ’ was in all modified castings. Presence of other microstructural features, such as Ti-rich needles, eutectic γ-γ’ islands, small Al-rich and Cr-rich precipitates depended on the casting composition. The lowest solidus and liquidus temperatures were observed in superalloys with a high Al/Ti ratio. Consequently, in A7–A9 variants, the solidification range did not exceed 100 °C. In the A0 variant the difference between liquidus and solidus temperature was 138 °C. Hardness of all modified superalloys was at least 50% higher than for the remelted Inconel 740 (209 HV10).

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“…Tliq is the temperature in which the very first solid crystals are formed in the molten metal and is useful in optimisation of the pouring temperature to ensure the good balance between liquid metal fluidity, casting shrinkage and solubility of impurities. Tsol temperature is useful in design as a limiter of operation temperature and for optimisation of heat treatment processes [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

ATD and DSC Analysis of IN-713C and ZhS6U-VI Superalloys

Bińczyk¹,

Cwajna²,

Gradoń³

2017

Archives of Foundry Engineering

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Paper presents the results of ATD and DSC analysis of two superalloys used in casting of aircraft engine parts. The main aim of the research was to obtain the solidification parameters, especially Tsol and Tliq, knowledge of which is important for proper selection of casting and heat treatment parameters. Assessment of the metallurgical quality (presence of impurities) of the feed ingots is also a very important step in production of castings. It was found that some of the feed ingots delivered by the superalloy producers are contaminated by oxides located in shrinkage defects. The ATD analysis allows for quite precise interpretation of first stages of solidification at which solid phases with low values of latent heat of solidification are formed from the liquid. Using DSC analysis it is possible to measure precisely the heat values accompanying the phase changes during cooling and heating which, with knowledge of phase composition, permits to calculate the enthalpy of formation of specific phases like γ or γ′.

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The Influence of the Melt-Pouring Temperature and Inoculant Content on the Macro and Microstructure of the IN713C Ni-Based Superalloy

Cited by 18 publications

References 29 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

Fabrication and Characterization of the Newly Developed Superalloys Based on Inconel 740

ATD and DSC Analysis of IN-713C and ZhS6U-VI Superalloys

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