using the curves of properties vs % cold work solve the following problems. (Show all equations and your work in enough detail that it can be determined if you understand the process. Answers among lab sections vary since different curves are used for the property-cold work relationships. More emphasis will be placed on correct interpretation and use of the information rather than the numerical answer.)

a. A piece of 0.400 diameter annealed 70-30 brass bar is drawn to 0.310 diameter. Approximately how hard (HR 15 T) will the finished bar be? (5 pts)

b. It is desited to produce a 70-30 brass rod of 0.410 diameter that has a hardness of 80 HR 15T. What diameter must the annealed stock be to produce it? (5 pts)

c. Some 70-30 brass bar is available in stock, 3/8 in. thick. Its hardness is now 60 HR 15 T. If the bar is rolled to a thickness of 0.295 in. how hard will it be after you roll it? (5 pts)

d. Using Figure D-1 in Daltons text, what is the range of percent cold work required to meet the following specifications if the starting material is annealed 70/30 brass? What would be the target cold work?