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Predicting concurrent structural mechanical mechanisms during microstructure evolution.

P Soar1, A Kao1, N Shevchenko2

  • 1Centre for Numerical Modelling and Process Analysis, University of Greenwich, Old Royal Naval College, Park Row, London SE10 9LS, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|January 3, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a numerical model linking structural mechanics and microstructure solidification. It reveals how mechanical forces influence grain orientation, impacting casting defects and material properties.

Keywords:
crystallographic orientationdendrite deformationmicrostructure solidificationnumerical modellingstructural mechanics

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Area of Science:

  • Materials Science
  • Computational Mechanics
  • Solidification Science

Background:

  • The link between structural mechanics and microstructure solidification is experimentally known to cause casting defects.
  • Current numerical models for microstructure solidification often ignore this interaction, failing to predict phenomena like misoriented grain development.

Purpose of the Study:

  • To develop a numerical method that couples structural mechanics and solidification modeling.
  • To investigate how mechanical forces affect dendrite growth and microstructure development.
  • To predict the formation of misoriented grains and their impact on material properties.

Main Methods:

  • Coupling a finite volume structural mechanics solver with a cellular automata solidification solver.
  • Simulating the effects of gravity or pressure-driven displacements on solidifying dendrites.
  • Analyzing the changes in crystallographic orientation and growth behavior.

Main Results:

  • The coupled model successfully reproduces fundamental experimental observations.
  • Localized deformations were shown to significantly alter dendrite crystallographic orientation.
  • The model demonstrates how mechanical influences impact overall microstructure evolution.

Conclusions:

  • The developed numerical method accurately captures the interdependence of structural mechanics and microstructure solidification.
  • Mechanical stresses play a crucial role in determining grain orientation and microstructure development during casting.
  • This approach enables better prediction and control of casting defects by accounting for mechanical influences.