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Design of TRIP-Assisted Steels for Automobiles

Explore the microstructure study of TRIP-assisted steels for automobiles, focusing on mechanical properties, composition, and deformation mechanisms. Discover key research findings and implications for engineering design in this field.

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Design of TRIP-Assisted Steels for Automobiles

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  1. Design of TRIP-Assisted Steels for Automobiles

  2. Microstructure has been extensively studied • Microstructure understood: most aspects can be calculated • Mechanical properties cannot be calculated • Mechanical properties badly related to microstructure

  3. Typical composition: Fe-0.15C-1.5Si-1.5Mn wt% Bhadeshia & Edmonds, (1980)

  4. a b a Bhadeshia & Edmonds, (1980)

  5. Swallow & Bhadeshia, 1996

  6. engineering stress / MPa engineering strain Mizui et al. (1997)

  7. Jacques et al. (2001)

  8. Ro et al. (1994)

  9. 50 mm transformation-induced plasticity

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

  11. s d c r 1 Transformation is a deformation on habit plane Can be induced by stress

  12. Bhadeshia, 1982

  13. polycrystalline austenite s 50 mm Bhadeshia, 1982

  14. s d z3 z1

  15. v u

  16. Sakuma et al. (1991)

  17. absorbed energy / kJ Yoshitake et al. (1996)

  18. Composite of soft and hard phase Bhadeshia & Edmonds, (1980)

  19. Strain in hard phase strain in soft phase Bhadeshia & Edmonds, (1980)

  20. Tomota (1976)

  21. Bhadeshia & Edmonds, (1980)

  22. Chester and Bhadeshia, 1997

  23. Chester and Bhadeshia, 1997

  24. Chester and Bhadeshia, 1997

  25. Chester and Bhadeshia, 1997

  26. high silicon low silicon silicon causes scale Jacques et al. (2001)

  27. Summary • Assistance from TRIP is less than 1.4% of total strain • Emphasis could be shifted from retained austenite to studies of composite deformation • Low silicon steels can perform well (Jacques)

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