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Related Experiment Video

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Microstructure and Properties of Different Modulus Sections in JG4246A Alloy Characteristic Simulation Castings.

Hai-Tao Jiang1,2, Lei Jin1,2, Gao-Yang Jing1,2

  • 1China Academy of Machinery Shenyang Research Institute of Foundry Co., Ltd., Shenyang 110022, China.

Materials (Basel, Switzerland)
|March 14, 2026
PubMed
Summary

This study on nickel-aluminum superalloys reveals that faster cooling rates produce finer grains and higher strength in castings. Slower cooling leads to larger grains and reduced mechanical properties.

Keywords:
JG4246A alloycrackdifferent modulamechanical propertymicrostructure

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Area of Science:

  • Materials Science
  • Metallurgy
  • Casting Technology

Background:

  • Nickel-aluminum (Ni3Al) based superalloys are critical for high-temperature applications.
  • Understanding microstructure-property relationships in cast superalloys is essential for performance optimization.
  • Casting process parameters significantly influence the final microstructure and mechanical properties.

Purpose of the Study:

  • To investigate the impact of cooling rates on the microstructure and room temperature mechanical properties of cast JG4246A Ni3Al-based superalloy.
  • To establish a quantitative correlation between cooling rate, grain size, carbide morphology, and mechanical properties.
  • To provide guidelines for optimizing the casting process of high-temperature alloys.

Main Methods:

  • Characteristic simulation castings of JG4246A superalloy were produced under controlled preheating and pouring temperatures.
  • Systematic investigation of microstructural features (grain size, carbide size) across different sections of the castings.
  • Measurement of room temperature mechanical properties, including tensile strength and yield strength, at various locations.

Main Results:

  • Cooling rates varied across casting sections, with the fastest at the upper-right corner and slowest at the lower-middle section.
  • Finer grain sizes (0.46 mm) and higher strength (tensile ~698 MPa, yield ~581 MPa) were observed at faster cooling rates.
  • Larger grain sizes (1.55 mm) and lower strength (tensile ~612.5 MPa, yield ~524.5 MPa) were associated with slower cooling rates.
  • MC carbide size and distribution also varied, correlating with mechanical properties like elongation.

Conclusions:

  • A clear quantitative relationship exists between cooling rate, microstructure, and mechanical properties in cast Ni3Al superalloys.
  • Optimizing casting parameters, specifically cooling rate, is crucial for achieving desired microstructural uniformity and mechanical performance.
  • The findings offer valuable insights for enhancing the casting process and ensuring microstructural consistency in high-temperature alloy components.