Two identical metal sheets of 1 cm thickness is made out of

Two identical metal sheets of 1 cm thickness is made out of the the same material. These sheets are cold-rolled to reduce their thickness. As a result, final thickness of sheet A is measured to be 5 mm whereas the final thickness of sheet B is measured to be 2 mm.

a) Which of these sheets would you expect to have higher strength in the rolling direction? Explain.

b) Which of these sheets would you expect to have higher ductility through its thickness? Explain.

c) If both sheets are annealed at a temperature that is 40% of the melting temperature of the metal, which sheet is expected to have a higher strength at the end of the annealing process? Explain.

Solution

>> Sheet A would likely to hae higher strength in the rolling direction, as the reduction in thickness is less in case of A as compared to B

Due to this, A should have more strength which is the reason it resists more reduction in thickness and thus have more strength than sheet B

>> Solution (b)

As, Reduction ratio is more of B as compared to A.

So, Sheet B is expected to have higher ductility as it can reduce more than sheet A

>> Solution (c)

After this heat treatment, due to exhibition of moree ductile behaviour of sheet B , Sheet B will show more strength ....