Checklist for exam 2 (2005)

Know what these are:

1. vacancy & vacancy mechanism for diffusion

2. activation energy

3. diffusion coefficent

4. allotropic forms of elemental Fe

5. interstice

6. AUS, FE, CM, P

7. TTT curve

8, Gibbs energy of reaction

9. phase

10. solid solution

11. substitutional atom

12. Fe3C

13. lamellar structure

14. eutectoid

15. proeutectoid phase

16. hypoeutectoid, hypereutectoid

17. MAR, tempered MAR

18. MAR start, MAR finish

19. harden, hardenability

20. full harden

21. tempering

22. stress relief

23. alloy carbide

24. austenitize

25. A1, A3, ACM

26. stainless steel & types

27. tool steel

28. water, oil, air quenches

29. carbide tool

30. powder metallurgy

31. microconstituent

Know & understand these phase diagrams:

1. Fe-C!!!!

2. Fe-Cr

3. Fe-Ni

Concepts:

Solid solutions

Phase

Phase diagrams

Mechanism for difffusion in solids

What controls diffusion rates in solids

Phases in steels

What happens, in detail, upon very slowly cooling AUS
and what microstructures form

TTT curves

How does MAR form?

Why does MAR form?

Why is MAR brittle?

What controls position of TTT curves?

What happens during tempering?

Effects of temperature & time in tempering

Why is stainless steel stainless?

Why are there 3 classes of stainless steels?

What happens during sintering?