Question

Nitrogen from a gaseous phase is to be diffused into pure iron at 700°C. If the surface concentration is maintained at 0.12 wt% N, what will be the concentration (in weight percent) 3.7 mm from the surface after 8.3 h? The diffusion coefficient for nitrogen in iron at 700°C is 3.0 × 10-10 m2/s.

Also, A cylindrical specimen of a brass alloy 10.1 mm (0.3976 in.) in diameter and 119.8 mm (4.717 in.) long is pulled in tension with a force of 12000 N (2698 lbf); the force is subsequently released. The tensile stress-strain behavior for this alloy is shown in the Animated Figure 6.12. Compute the final length of the specimen at this time. answer in milimeters

Answer 1