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Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718.

Andreas Malmelöv1, Martin Fisk2,3, Andreas Lundbäck1

  • 1Division of Mechanics of Solid Materials, Luleå University of Technology, SE-971 87 Luleå, Sweden.

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Summary

A new flow stress model accurately predicts material behavior in nickel-based superalloys (alloy 625 and alloy 718) during thermo-mechanical processes. This enhanced model improves simulations of manufacturing by capturing high-temperature plasticity and stress relaxation.

Keywords:
Inconeldislocation densityflow stress modelmaterial modelstress relaxation

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Area of Science:

  • Materials Science and Engineering
  • Mechanical Engineering
  • Computational Modeling

Background:

  • Accurate prediction of material behavior is crucial for modeling thermo-mechanical processes.
  • Existing models require enhancement to capture complex responses in nickel-based superalloys.
  • Alloy 625 and alloy 718 are critical materials in high-temperature applications.

Purpose of the Study:

  • To develop and adapt a mechanism-based flow stress model for alloy 625 and alloy 718.
  • To incorporate solid solution strengthening and high-temperature plasticity into the model.
  • To validate the model's predictive capability for stress relaxation.

Main Methods:

  • A previously published mechanism-based flow stress model was updated and refined.
  • Solid solution strengthening and high-temperature plasticity models were implemented.
  • The model was calibrated using compression data (0.01–1 s-1, room temp. to melting point) and validated with stress relaxation tests.

Main Results:

  • The enhanced flow stress model accurately represents alloy 625 and alloy 718 behavior.
  • Deformation mechanism maps were generated to identify dominant mechanisms.
  • Model parameters showed remarkable similarity for both alloys, despite material differences.
  • Simulated stress relaxation closely matched experimental data.

Conclusions:

  • The developed model provides a robust tool for simulating manufacturing processes involving significant strain rate and temperature variations.
  • The model's inherent ability to capture stress relaxation enhances its applicability.
  • The findings suggest a unified modeling approach may be feasible for similar nickel-based superalloys.