for a steel alloy it has been determined that a carburizing heat treatment of 13 h duration at 729°c will raise the carbon concentration to 0.43 wt% at a point 3.2 mm from the surface. estimate the time necessary to achieve the same concentration at a 7.6 mm position for an identical steel and at a carburizing temperature of 1050°c. assume that d0 is 1.4 × 10-4 m2/s and qd is 104 kj/mol. enter your answer in accordance to the question statement h