55 wt C is exposed to an oxygen rich and virtually carbon free atmosphere at

55 wt c is exposed to an oxygen rich and virtually

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An FCC iron–carbon alloy initially containing 0.55 wt% C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1325 K (1052°C). Under these circumstances the carbon diffuses from the alloy and reacts at the surface with the oxygen in the atmosphere—that is, the carbon concentration at the surface position is maintained essentially at 0 wt% C. (This process of carbon depletion is termed decarburization.) At what position will the carbon concentration be 0.25 wt% after a 10-h treatment? The value of D at 1325 K is 3.3 × 10 –11 m 2 /s. Problem 4. (20 pts) A cylindrical specimen of a nickel alloy having an elastic modulus of 207 GPa (30 × 10 6 psi) and an original diameter of 10.2 mm (0.40 in.) experiences only elastic deformation when a tensile load of 8900 N (2000 lb f ) is applied. Compute the maximum length of the specimen before deformation if the maximum allowable elongation is 0.25 mm (0.010 in.). Problem 5. (20 pts) A cylindrical rod of steel (E = 207 GPa, 30 × 10 6 psi) having a yield strength of 310 MPa (45,000 psi) is to be subjected to a load of 11,100 N (2500 lb f ). If the length of the rod is 500 mm (20.0 in.), what must be the diameter to allow an elongation of 0.38 mm (0.015 in.)?
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  • Fall '19
  • Jane Smith
  • Tensile strength, 2 kg, 7 kg, 2.0 mm, 6.0-mm, 2.5-mm

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