A sheet of BCC iron 1 mm thick was exposed to a carburizing gas atmosphere on one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces of the sheet were determined to be 0.012 and 0.0075 wt%. Compute the diffusion coefficient if the diffusion flux is 1.4 × 10-8 kg/m2 -s.

A sheet of BCC iron 1 mm thick was exposed to a carburizing gas atmosphere on one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces of the sheet were determined to be 0.012 and 0.0075 wt%. Compute the diffusion coefficient if the diffusion flux is 1.4 × 10-8 kg/m2 -s.

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter4: Temperature Effects On Atom Arrangements And Atom Motion

Section: Chapter Questions

Problem 4.24P

See similar textbooks

Similar questions

6. The hollow fiber membrane in a hollow fiber module has a water permeability coefficient ofα=1.6·10-5m/(s·Mpa), and an outer diameter of 0.1 mm. In a RO desalination test, the module exhibits a water flux ofJv= 5 m3/day under the pressure of 6.0 Mpa and a temperature of 298 K. The length of the hollow fiber is 1 m. Please determine how many hollow fibers are included in the module, and what is the water flux for a single hollow fiber (m3/day)?The water flux(Jv)is determinedbyJv=α·A·ΔPwhereαis the water permeability coefficient,A is the membrane area, ΔPis the pressure
Discuss the effect of the addition of an electrolyte and the formation of flocs.
An aluminum pipe has a length of 69 m at a temperature of 8°C. An adjacent steel pipe at the same temperature is 5 mm longer. At what temperature will the aluminum pipe be 15 mm longer than the steel pipe? Assume that the coefficient of thermal expansion for the aluminum is 22.5×10-6/°C and that the coefficient of thermal expansion for the steel is 12.5×10-6/°C.
For a steel alloy it has been determined that a carburizing heat treatment of 11.9 h duration will raise the carbon concentration to 0.440 wt% at a point 1.00 mm from the surface. Estimate the time necessary to achieve the same concentration at a 6.40 mm position for an identical steel and at the same carburizing temperature.
Using the intermolecular forces, explain why the freezing and melting point decreases when adding salt to water!
If the temperature of the liquid and gas increases by the same amount, what effect does this have on the viscosity for each of them?
Nonhomogeneous
A liquid has a specific weight of 48 lb/ft^3 and a dynamic viscosity of 3.05 lb-s/ft^2. What is the kinematic viscosity (ft^2/s)?
An activated-carbon bed that is 12 ft x 6 ft x 2 ft deep is used in a benzene recovery system. The system is on-line for one hour and is then regenerated for one hour.
which type of bituminous materials used in the selected zone (colored in green ) shown in figure below