1. Using the iron-Carbon equilibrium phase diagram, please describe the lines of transformation to austenite during heating with carbon content < 0.77 wt.%. (Hint: use the transformation starting line (A1) and the transformation finish line (A3)).

2. What is a typical pearlite structure?

3. What is the difference between TTT diagram and CCT diagram? What is the relation between them? How are they used to estimate a quenching hardening process in a heat treat shop?

4. What is the harden ability, and how will the alloy and carbon contents affect it?

5. What are the three phases at the liquid and solid interface during an immersion oil quenching process?

6. Why press quench is used in some quenching hardening process with tremendous cost increase?

7. List five important material properties to understand a steel part’s responses during a quench hardening process.

8. What is the main difference between phase transformations from austenite to marten site and from austenite to pearlite?

9. What is transformation induced plasticity (TRIP)?

10. Please list five critical process parameters during an oil quench hardening process (quenching hardening may include heating process).