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Engineering, 26.02.2020 03:18 carafaith02

The yield strength of mild steel is 150 MPa for an average grain diameter of 0.038 mm ; yield strength is 250 MPa for average grain diameter 0.009 mm.

What is the yield strength for the same steel having an average grain diameter 0.004mm?

Hint: Assume Hall-Petch equation is valid.

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