For a steel alloy it has been determined that a carburizing heat treatment of 14 h duration at 809°c will raise the carbon concentration to 0.54 wt% at a point 3.6 mm from the surface. estimate the time necessary to achieve the same concentration at a 6.0 mm position for an identical steel and at a carburizing temperature of 1100°c. assume that d0 is 2.5 × 10-5 m2/s and qd is 120 kj/mol.

Explanation:

Given data:

carbon concentration  =  0.54%

from the relation given below calculate the time required to achieve concentration at 6.00 mm from surface

D considered constant

here, x POSITION FROM SURFACE, t is time required to achieve concentration

answer:

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explanation: