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. Whatheat treatment (high level concepts only, no specific times or temperatures needed) wouldyou suggest to

1) reduce the warpage, and
2) maintain hardness of the edge, and
3) maintainsome level of fracture toughness; of the katana blade.

Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers