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Diffusion Modelling on the Microstructure Evolution in MCrAlY-Superalloy System.

Zhenyuan Xu1,2,3, Kang Yuan1,2,3, Zhaoran Zheng1,2,3

  • 1BGRIMM Technology Group, Beijing, 100160 China.

Journal of Thermal Spray Technology
|April 16, 2024
PubMed
Summary
This summary is machine-generated.

Elemental diffusion in MCrAlY-superalloy systems is modeled using core-shell and planner models. These simulations explain microstructural development and predict coating-substrate interactions, aiding in designing advanced thermal barrier coatings.

Keywords:
MCrAlYcore–shellinterdiffusionoxidation

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Area of Science:

  • Materials Science
  • Metallurgy
  • Computational Modeling

Background:

  • High-temperature elemental diffusion is critical for microstructure evolution in MCrAlY-superalloy systems.
  • Understanding diffusion mechanisms is essential for developing advanced coatings for extreme environments.

Purpose of the Study:

  • To develop and apply diffusion models for simulating elemental behavior in MCrAlY coatings and coating-substrate systems.
  • To elucidate the mechanisms behind specific microstructural formations at different temperatures.
  • To investigate the impact of MCrAlY coatings on the substrate and provide design guidelines.

Main Methods:

  • Development of a core-shell diffusion model to analyze localized microstructural thermodynamics and kinetics.
  • Implementation of a coating-substrate planner diffusion model to simulate interdiffusion.
  • Validation of simulation results against experimental observations in Ni22Cr10AlY-superalloy systems.

Main Results:

  • The core-shell model successfully explained the formation of α(core)-γ'(shell) at 750°C and γ(core)-β(shell) at 1100°C.
  • The planner model showed semiquantitative agreement with experimental interdiffusion data.
  • The study analyzed the influence of MCrAlY coatings on the formation of topologically close-packed (TCP) phases in the substrate.

Conclusions:

  • Diffusion models provide valuable insights into MCrAlY-superalloy high-temperature behavior.
  • The developed models can predict microstructural evolution and coating-substrate interactions.
  • A GOODMAN map for designing TCP-limited MCrAlY coatings was proposed, aiding material selection and performance optimization.