Engineering, 06.10.2019 10:01, itsme77
The outer surface of a steel alloy is to be hardened by increasing its carbon content. the carbon is to be supplied from an external carbon-rich atmosphere, which is maintained at an elevated temperature. a diffusion heat treatment at 868°c for 13 min increases the carbon concentration to 0.90 wt% at a position 1.3 mm below the surface. estimate the diffusion time required at 700°c to achieve this same concentration also at a 1.3 mm position. assume that the surface carbon content is the same for both heat treatments, which is maintained constant. the preexponential and activation energy values for the diffusion of carbon in the iron are 5.2 × 10-6 m2/s and 76.0 kj/mol, respectively.
Answers: 3
Engineering, 03.07.2019 14:10, cowgyrlup124
Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.
Answers: 1
Engineering, 03.07.2019 14:10, volleyballfun24
If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.
Answers: 3
Engineering, 04.07.2019 18:20, sanchez626
Aheavily insulated piston-cylinder device contains 0.02 m3 of steam at 300 kpa and 200 °c. 1.2 mpa. d this process. team is now compressed in a reversible manner to a pressure of etermine the entropy change and the work done on the steam during this process
Answers: 1
The outer surface of a steel alloy is to be hardened by increasing its carbon content. the carbon is...
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