Question: Suppose a polycrystalline steel sample with an average grain diameter of 65 microns has a yield strength of 135 MPa. The yield strength of

Suppose a polycrystalline steel sample with an average grain diameter of 65 microns has a yield strength of 135 MPa. The yield strength of the same steel material is doubled when it has an average grain diameter of 12 microns. What is the average grain size of the material after it is work hardened to raise its yield stress to 350 MPa?

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