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Homework Help: Non-Steady State Diffusion

  1. Feb 28, 2008 #1
    [SOLVED] Non-Steady State Diffusion

    1. The problem statement, all variables and given/known data
    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.

    2. Relevant equations

    3. 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.
  2. jcsd
  3. Feb 28, 2008 #2
    Never mind guys I got it. Didnt know one could manipulate the erf function as I did.
  4. Sep 20, 2008 #3
    Re: [SOLVED] Non-Steady State Diffusion

    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.
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