The lower yield point for an iron that has an

The lower yield point for an iron that has an

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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