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1. (30) INCLUDED IN EXAM 2 The ductility and tensile strength vs. % of cold work for three metals is shown below. A cylindrical specimen of 1040 steel has an initial diameter of 15 mm and it is cold worked such that its diameter is reduced to 18 mm. 1040 Sheet 30 500 Copper 1 1040 Stop Copper 10 20 10 20 30 40 58 60 39 40 50 60 70 Percent cold work (a) (18) What are the resulting ductility and tensile strength of the sample? (b) (3) An annealing process is provided for the sample after cold work, what are the three stages during annealing (in sequence)? Page 2 of 6 (c) (6) With annealing, material properties change compared to its cold worked properties. Indicate whether the following properties would increase or decrease. a. Ductility Strength c. Hardness d. Grain size (please briefly describe the trend) (d) (3) If annealing is carried out for a very long time, please comment on the metal properties compared to the pre-cold worked sample (the one before any cold work)