Non Steady State Diffusion (NSSD) Example problem • You want to carburize a steel drill bit in the presence of methane. The drill bit initially has a uniform carbon concentration of 0.25 wt% and is to be treated at 950 °C (1750 °F). If the concentration of carbon at the surface is suddenly brought to and maintained at 1.20 wt%, how long will it take to achieve a carbon content of 0.80 wt% at a position 0.5mm below the surface? (The diffusion coefficient for carbon in iron at this temperature is 1.6 x 10-11 m2/s.) Cx – Co х C = Concentration of source = 1 – erf(- - Co = Concentration at distance x Cs C, = Concentration of h0st %3D
Non Steady State Diffusion (NSSD) Example problem • You want to carburize a steel drill bit in the presence of methane. The drill bit initially has a uniform carbon concentration of 0.25 wt% and is to be treated at 950 °C (1750 °F). If the concentration of carbon at the surface is suddenly brought to and maintained at 1.20 wt%, how long will it take to achieve a carbon content of 0.80 wt% at a position 0.5mm below the surface? (The diffusion coefficient for carbon in iron at this temperature is 1.6 x 10-11 m2/s.) Cx – Co х C = Concentration of source = 1 – erf(- - Co = Concentration at distance x Cs C, = Concentration of h0st %3D
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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After entering Cs, C0 and Cx into the LHS of Fick's second law equation, what does erf(z) equal to? Note: I use erf(y) and erf(z) interchangeably. It just depends on the table we're working with.
erf(z) =
After linear interpolation, what does z=
How much time is required to achieve a carbon content of 0.80% at a position 0.5 mm below the surface?
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