Question
Asked Nov 4, 2019
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A nitriding heat treatment of a BCC steel normally requires 2 h at 600 °C. What temperature would be required to reduce the heat treatment time to 1 h?
(Q =76570 J/mol, Do =0.0047x10- 4 m2/s)

 

and the last one. thanks for ur helping.

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Expert Answer

Step 1

Write the given values and constants for the given process:

Do 4.7x107 m2/s
Q76.57 kJ/mol
2hr 7200 s
t, 1 hr 3600s
T 600°C
T, ?
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Do 4.7x107 m2/s Q76.57 kJ/mol 2hr 7200 s t, 1 hr 3600s T 600°C T, ?

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Step 2

Write the relationship between tempera...

D Do exp
(1)
RT
Write the error function
х
C(x,t) AB erf
2VDt
Consider
C(r,4) C(x,4)
А - В erf
— А - В erf
(A& B are constant
2 D,t
2D,t
erf
= erf
2Dt,
21Dt,
2Dt
Dt Dl
2 D,t,
(2)
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Image Transcriptionclose

D Do exp (1) RT Write the error function х C(x,t) AB erf 2VDt Consider C(r,4) C(x,4) А - В erf — А - В erf (A& B are constant 2 D,t 2D,t erf = erf 2Dt, 21Dt, 2Dt Dt Dl 2 D,t, (2)

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