5. Given a straight bar of 1080 steel from the foundry, it was machined into a katana blade. After machining, there are clear signs of warpage and the blade is no longer straight. What heat treatment (high level concepts only, no specific times or temperatures needed) would you suggest to 1) reduce the warpage, and 2) maintain hardness of the edge, and 3) maintain some level of fracture toughness; of the katana blade.

6. What is the average hardness of a pearlite structure?

7. Define the following heat treatment processes: a) normalizing; b) full annealing; and c) process annealing. How are these processes performed and what changes in mechanical properties can they provide?

8. Explain why the specimens of high carbon steel, after being heated to 500C and 960C and then quenched from that temperature, have different hardness. Indicate the differences of obtained microstructure of these specimens after quenching?