The lower yield point for an iron that has an average grain diameter of 1 × 10–2 mm is 230 mpa. at a grain diameter of 6 × 10–3 mm, the yield point increases to 275 mpa. at what grain diameter will the lower yield point be 310 mpa? express the answer in mm to three significant figures
Answers: 2
The yield strenght
Average grain diameter
constant for the particular material
mm and 230Mpa for 
,
(1)
and 275Mpa for 
(2)
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The lower yield point for an iron that has an average grain diameter of 1 × 10–2 mm is 230 mpa. at a...
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