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Crystallography in Materials Science: Deformation, Texture, and Grain Refinement

Learn about crystallography in materials science, point groups, stereographic projections, space groups, deformation mechanisms, slip, twin boundaries, strain transformations, and grain size refinement in steels.

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Crystallography in Materials Science: Deformation, Texture, and Grain Refinement

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  1. Crystallography H. K. D. H. Bhadeshia Introduction and point groups Stereographic projections Low symmetry systems Space groups Deformation and texture Interfaces, orientation relationships Homogeneous deformations Slip, twinning and invariant-plane strains

  2. v u v A u B Similarity transformation

  3. homogeneous deformation leaves points originally in a line, colinear, and lines originally in a plane, coplanar

  4. similarity transformation

  5. general invariant-plane strain simple shear uniaxial dilatation s s d d 1 1 1 s=0.26 d=0.03

  6. stretch and rotation

  7. Refinement of austenite grain size • repeated recrystallisation • pancaking • Refinement of ferrite grain size • nucleation and growth

  8. Smallest size possible in steel ?

  9. Yokota & Bhadeshia, 2004

  10. Pancaking

  11. courtesy Rongshan Qin, GIFT, POSTECH Singh & Bhadeshia, 1998

  12. v = Su u v

  13. Cross Rolling second pass rotate 90° x first pass y y x

  14. courtesy of Rongshan Qin

  15. Chae, Qin, ISIJ International 49 (2009) 115

  16. TWIP steel

  17. B. Qin, MST 28 (2008) 969

  18. correspondence matrix

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