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## Homework Statement

For a steel alloy below, it has been determined that a carburizing heat treatment of 15 hr duration will raise the carbon concentration to 0.35% at a point 2.0 mm from the surface. Estimate the time necessary to achieve the same concentration at a point 6.0 mm position for an identical steel and at the same carburizing temperature.

## Homework Equations

## The Attempt at a Solution

Because the %Concentration and Temperature are the same, their should be a linear relationship between time and depth but I cannot think of a way to determine the Diffusion Coefficient or an equation for the relationship. Looking for a gentle shove in the right direction.

Thanks so much