(a) a cylindrical piece of steel 50 mm in diameter is to be quenched in oil and must have a minimum hardness of 45 hrc throughout the entire piece. which of these steels 8660, 8640, 8630, and 8620 will work? justify your choice(s). (b)what is the maximum diameter of 8640 steel that can be oil quenched and have a surface hardness of 50hrc?

For each of the following process: a) sketch the p-v diagram, b)sketch t-s diagram, c) sketch t-v diagram, d) sketch the boundary work on one of the diagrams (a, b or c) and e) sketch the reversible heat transfer on one of the diagrams (a, b or c): 1- isobaric process from compressed liquid to superheated vapor 2- isothermal process from compressed liquid to superheated vapor 3- isentropic process from compressed liquid to superheated vapor