The minimum yield strength for iron with an average grain size of 6x10^-2 mm is 135 MPa, this increases to 260 MPa when the average grain size is reduced to 8x10^-3 mm. What must the average grain size be to achieve a yield strength of 205 MPa.

Question The yield strength for an aluminum alloy that has an average grain diameter of 10 um is 400 MPa. As the grain diameter is increased to 80 um, the yield strength decreases to 260 MPa. When the grain diameter is 2 um, its yield strength is close to 760 MPa 668 MPa 566 MPa 419 MPa

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The yield strength for an alloy that has an average grain diameter of 5.3 x 10 146 MPa. At a grain diameter of 7.8 × 10-3 mm, the yield strength increases to 249 MPa. At what grain diameter, in mm, will the yield strength be 236 MPa? d = Ex 0.0022 mm Check Try again 1

Question 2 (a) The lower yield point for an iron that has an average grain diameter of 1 x 102 mm is 230 MPa. At a grain diameter of 6 x 103 mm, the yield point increases to 275 MPa. At what grain diameter will the lower yield point be 310 MPa? (b) Predict the yield strength of the iron when the average grain diameter is 8.0 x 10-3 mm.

An uncold-worked brass specimen of average grain size 0.006 mm has a yield strength of 178 MPa. Estimate the yield strength of this alloy (in MPa) after it has been heated to 600°C for 1000 s, if it is known that the value of ky is 11 MPa-mm1/2. The Animated Figure 7.25 may be helpful. Attached is the question and the figure referenced.

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3. An uncold-worked brass specimen of average grain size 0.01 mm has a yield strength of 150 MPa (21,750 psi). Estimate the yield strength of this alloy after it has been heated to 500°C for 1000 s, if it is known that the value of σo is 25 MPa. (Note that the axis has logarithmic scale). Grain diameter (mm) (Logarithmic scale) 1.0 0.1 0.01 1 10 850°C 800°C 700°C 102 Time (min) (Logarithmic scale) 600°C 500°C 103 104

an alloy with an avg grain diameter of 0.053 mm is l16 MPa. When the grain diameter is 0.008Amm, the yeild strength goesupto 231 MPa.lf the yeild strength is 207MPA, what would the grain diameter be?

Question 1 You are working on a design team at a small orthopaedic firm. You have been asked to select a cobalt- chrome-molybdenum (CoCr) material that will not experience plastic deformation under a specific mechanical test, as follows... A tensile stress is applied along the long axis of a solid cylindrical rod that has a diameter of 10 mm. An applied load of some magnitude F produces a 7x10³ mm change in diameter (see figure below, original shape is blue, elongated shape is unshaded). Q1F: How would the "new alloy" material (with different properties as shown below) behave, assuming it has the same initial diameter (10mm) and applied load (F) in the tensile test? That is, would it experience plastic deformation (yield) under the conditions of this problem?