The yield stress for a metal changes from 450 Nmm-2 to 610 Nmm-2 when the average grain diameter decrease from 0.043 mm

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answerhappygod
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The yield stress for a metal changes from 450 Nmm-2 to 610 Nmm-2 when the average grain diameter decrease from 0.043 mm

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The yield stress for a metal changes from 450 Nmm-2 to 610 Nmm-2
when the average grain diameter decrease from 0.043 mm to 0.022 mm.
Determine the yield stress for the same metal with an average grain
diameter of 0.030 mm.
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