The final thickness of a hard copper sheet is 1.0 mm. It was produced by cold working with 25% deforestation. What was the starting thickness of the metal before the cold working ? To decrease the hardness what will you do ?

Final thickness of a hard copper sheet = 1.0 mm
25% deformed
Suppose, x = 0.25
So that 0.75x = 1
x = 1/0.75 = 1.33
To decrease the hardness, we will do further normalising.

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