Time Estimation for Non-Steady State Diffusion in Steel Alloy

[Suitengu]

[SOLVED] Non-Steady State Diffusion

Homework Statement

For a steel alloy below, it has been determined that a carburizing heat treatment of 10 hr duration will raise the carbon concentration to 0.45%. Estimate the time necessary to achieve the same concentration at a point 5.0 mm position for an identical steel and at the same carburizing temperature.

Homework Equations

The Attempt at a Solution

Have not picked on what to do but I am currently still manipulating the formula of non-steady state diffusion. So if I can get push in the right direction, that would be appreciated.

 

[Suitengu]

Never mind guys I got it. Didnt know one could manipulate the erf function as I did.

 

[buzachaka]

I have the same problem and am completely stuck. I know that the coefficient of diffusion and Concentration values are equal between the two situations... but am completely at a loss of how to manipulate the equation to determine the time.

.. need a little push.