Hardness (RHC) Mark Level [in] 0% CW 0.25 25% CW 50% CW 25% CW 0% CW 52.5 53 55 53 52.5 0.5 56 0.75 54 1 55 1.25 56 1.5 53 1.75 43 2 33 37 38 37 34 2.25 2.5 37 33 2.75 31 3 18.5 26.5 26 25.5 13 3.5 19 4 13 Make a plot of hardness vs. % reduction in thickness, assuming that % reduction varies linearly across the width of the specimen from 0 at the edge to 50% at the center. (a) Assuming that the temperature during heat treatment varied linearly from 100 C at the cold end to 700 C at the hot end, (which is a simplification), plot hardness vs. annealing temperature for the most severely cold worked side of the specimen. (b) What is the recrystallization temperature for 50% cold work? Compare with phase diagram in materials science lab. Hardness (RHC) 60 50 40 30 20 10 Hardness vs Annealing Temperature 60 Hardness vs Reduction in Thickness 0 0 100 200 300 400 500 600 Annealing Temperature (C) 700 Hardness (RHC) 45 35 10 2525252222250 25 Thickness Reduction (%) 50 0.25 inch line 2 inch line 3 inch line