(a)
Interpretation:
The carbon content at 0.05cm beneath the surface needs to be calculated, if iron in BCC is given also carbon present is 0.05% is heated at 9120C at atmosphere which produces 1.20% C at the surface and held for 24hr.
Concept Introduction:
Fick's second law equation is given by the following relation:
Here,
D = diffusion coefficient
Cs = constant concentration for the material surface of diffusion atoms.
Co = initial concentration of diffusion on
Cx = diffusing concentration atom at location x
T = time
Also diffusion coefficient for carbon in BCC by Arrhenius type equation relation is as follows:
Where,
Dacc = diffusion coefficient
Do = constant
Q = activation energy
R = Gas constant
T = absolute temperature
(b)
Interpretation:
The carbon content at 0.05 beneath the surface needs to be determined, if the iron is FCC, also given that iron-containing 0.05% c is heated at 9120C, 1.20% C at the surface, time is 24 hr. The diffusion in iron in BCC and in FCC needs to be explained.
Concept Introduction:
Fick's second law equation is given by the following relation:
Here,
D = diffusion coefficient
Cs = constant concentration for the material surface of diffusion atoms.
Co = initial concentration of diffusion on
Cx = diffusing concentration atom at location x
T = time
Also diffusion coefficient for carbon in FCC by Arrhenius type equation relation is as follows:
Here,
Dacc = diffusion coefficient
Do = constant
Q = activation energy
R = Gas constant
T = absolute temperature
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Chapter 5 Solutions
Essentials Of Materials Science And Engineering, Si Edition
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