The Hall-Petch equation relates the strength of a metal ot to the average grain diameter d:...
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The Hall-Petch equation relates the strength of a metal ot to the average grain diameter d: 0₁ = 00 +kd where do and k are material constants. A particular metal has an average grain diameter of 0.35 mm and the following material constants: • %0= 70 MN m²; . k = 0.74 MN m-3/2, To what does the average grain diameter have to be reduced in order to double the strength of the material? Give your answer in mm to 2 significant figures. Grain size: mm The Hall-Petch equation relates the strength of a metal ot to the average grain diameter d: 0₁ = 00 +kd where do and k are material constants. A particular metal has an average grain diameter of 0.35 mm and the following material constants: • %0= 70 MN m²; . k = 0.74 MN m-3/2, To what does the average grain diameter have to be reduced in order to double the strength of the material? Give your answer in mm to 2 significant figures. Grain size: mm
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