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For a steel alloy it has been determined that a carburizing heat treatment of 11 h...

For a steel alloy it has been determined that a carburizing heat treatment of 11 h duration at 822°C will raise the carbon concentration to 0.49 wt% at a point 2.7 mm from the surface. Estimate the time necessary to achieve the same concentration at a 5.7 mm position for an identical steel and at a carburizing temperature of 1130°C. Assume that D0 is 2.4 × 10-5 m2/s and Qd is 112 kJ/mol.

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