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

Journal Article · Mon Jul 15 04:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-04098-9· OSTI ID:22970682

Rakoczy, Łukasz ^[1]; Grudzień-Rakoczy, Małgorzata ^[2]; Cygan, Rafał ^[3]

---

1. AGH University of Science and Technology, Department of Physical and Powder Metallurgy, Faculty of Metals Engineering and Industrial Computer Science (Poland)
2. Lukasiewicz Research Network-Foundry Research Institute (Poland)
3. Consolidated Precision Products Corp. (CPP), Investment Casting Division CPP-Poland (Poland)

In the investment casting process, the building of ceramic layers around the wax pattern is the main time-consuming 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 → γ + Ni{sub 7}Zr{sub 2} + (Nb, Zr)C.

• OSTI ID: 22970682
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 7 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
CASTINGS
CHEMICAL COMPOSITION
COPPER
CRYSTAL LATTICES
FUNGI
HARDNESS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
INDIUM ALLOYS
IRON
MICROSTRUCTURE
OPTICAL MICROSCOPY