HKIE Professional Assessment - Materials Discipline Practice Questions - HKIE Professional Assessment - Materials Discipline (Hong Kong Institution Of Engineers) Exam

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A structural carbon steel exhibits a friction stress σ0 of 70 MPa and a Hall-Petch strengthening coefficient ky of 0.74 MPa·m^(1/2). If thermomechanical processing reduces the average grain diameter d from 64 μm to 16 μm, what is the new yield strength σy?

162.5 MPa 255.0 MPa 366.0 MPa 185.0 MPa

Correct Answer:

255.0 MPa

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