Question: The lower yield point for an iron that has an average grain diameter of 5 10 -2 mm is 135MPa (19,500psi). At a grain

The lower yield point for an iron that has an average grain diameter of 5 × 10^-2 mm is 135MPa (19,500psi). At a grain diameter of 8 × 10^-3 mm, the yield point increases to 260MPa (37,500psi). At what grain diameter will the lower yield point be 205MPa (30,000psi)?

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