Question: The lower yield point for an iron that has an average grain diameter of 1 10-2 mm is 230 MPa (33,000 psi). At a

The lower yield point for an iron that has an average grain diameter of 1 × 10-2 mm is 230 MPa (33,000 psi). At a grain diameter of 6 × 10-3 mm, the yield point increases to 275 MPa (40,000 psi). At what grain diameter will the lower yield point be 310 MPa (45,000 psi)?

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