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Three-Dimensional Non-Homogeneous Microstructure Representation Using 2D Electron Backscatter Diffraction Data for

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This study reconstructs 3D microstructures from 2D data for additive manufacturing materials. The novel method accurately predicts material properties, enabling virtual testing of complex, non-homogeneous structures.

Keywords:
computational homogenization (CH)crystal elasticity finite element (CEFE)electron backscatter diffraction (EBSD)powder bed fusion–laser beam (PBF-LB)representative volume element (RVE)

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Computational Modeling

Background:

  • Additive manufacturing (AM) methods like powder bed fusion-laser beam (PBF-LB) produce complex geometries.
  • Predicting microstructural properties of AM parts is challenging due to process-induced non-homogeneity.

Purpose of the Study:

  • To develop a novel approach for 3D microstructure representation and virtual testing of non-homogeneous AM materials.
  • To investigate the relationship between microstructure evolution and material properties in PBF-LB Hastelloy X.

Main Methods:

  • Reconstruction of 3D microstructures from 2D electron backscatter diffraction (EBSD) data using the representative volume element (RVE) method.
  • Virtual testing via computational homogenization (CH) with a crystal elasticity finite element (CEFE) method.
  • Artificial generation of combined grain textures for stress distribution analysis.

Main Results:

  • Accurate 3D microstructure reconstruction capturing grain morphology of PBF-LB Hastelloy X.
  • Successful virtual prediction of directional elastic properties with low correlation error (0.5-3.5%).
  • Demonstrated strong correlation between microstructure and material properties.

Conclusions:

  • The developed methodology provides a reliable approach for virtual testing of non-homogeneous AM materials.
  • High confidence in predicting properties of artificially generated combined-grain structures.
  • Enables deeper insights into locally affected areas and global material behavior.