Question: Task 3 The minimum yield strength for iron with an average grain size of 6x10 -2 mm is 135 MPa, this increases to 260 MPa

Task 3 The minimum yield strength for iron with an average grain size of 6x10^-2 mm is 135 MPa, this increases to 260 MPa when the average grain size is reduced to 8x10^-3 mm. What must be the average grain size to achieve a yield strength of 205 MPa.

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