1. Severly Deformed Steels

2. Acknowledgments Professor J. R. Yang Dr Han-Shen Wang
Dr Hiroshi Harada

3. Severely deformed two-phase mixture
Severely deformed austenite
Theory and predictions
Future

4. theoretical tensile strength 21 GPa
Brenner, 1956

7. dual phase steel

8. Hono, 2002

9. Atom probe image of Scifer,
individual atoms visible
Atom probe image of Scifer,
5.5 GPa steel wire
Bhadeshia and Harada, 1993

13. mechanical
mixing m o Fe
free energy of ferrite Fe x x x a a¢
carbon

14. 0.2C - 1.2Si - 1.5Mn wt% 0.9C - 2.3Si - 1.5Mn at%

17. Scifer, 5.5 GPa and ductile
Kobe Steel

18. Precipitate ?

19. stainless steel thread

20. 316L

22. as-received
longitudinal
transverse

24. austenite
martensite

28. distance moved by dislocations
plastic strain
distance moved by dislocations
dislocation density
shear stress

29. grain size

30. Stress due to Driving Force
balance:

31. mechanical stabilisation when:

37. 50 µm