\"1 Verizon 5:33 AM * 94% Done Exam 1- 2014.pdf Problem 2 Consider the tensile s

Question

"1 Verizon 5:33 AM * 94% Done Exam 1- 2014.pdf Problem 2 Consider the tensile stress-strain curves, and answer the felowing questions Strain A) Samples 1 and 2 have the same composition and were processed identically, escqpt that one of them was cod worked more than the other. The stress-strain curves were obtained aficr the samples were cold worked. Which sample has the lower recrystallization semperature or 27 How do you know? he d mss by mplks1 and2 can be cold roled b a Pcer C) Samples 1 and 2 are identical except for the grain size. Which sample has the smaller grains? How do you know D) Samples I and 2 are identical except that they were anncaled at the same temperature for different periods of time. Which sample was anncaled foe the shorter period of time I or 2 How do you know?

Explanation / Answer

A)Sample 1

Stress strain curves for a material with progressively increasing cold work

b)sample 1 cold rolled to greater extents .

That is happens while energy to failure (toughness) with incresing cold work .

C)Cold work sample are hold smaller ones grain to form recovery grain

Grain Growth at longer time ,larger grains consume smaller ones .AT Highter temperature grain diameter are increased .

So smaple 1 smaller grain .

D) Sample 2 is not cold worked .sof Heating (annealing )can be process shorter period of time .

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