The outer surface of a steel alloy is to be hardened by increasing its carbon content. The carbon is to be supplied from an external carbon-rich atmosphere, which is maintained at an elevated temperature. A diffusion heat treatment at 846°C for 10 min increases the carbon concentration to 0.70 wt% at a position 1.6 mm below the surface. Estimate the diffusion time required at 630°C to achieve this same concentration also at a 1.6 mm position. Assume that the surface carbon content is the same for both heat treatments, which is maintained constant. The preexponential and activation energy values for the diffusion of carbon in the iron are 7.5 x 107 m²/s and 70.9 kJ/mol, respectively. min
The outer surface of a steel alloy is to be hardened by increasing its carbon content. The carbon is to be supplied from an external carbon-rich atmosphere, which is maintained at an elevated temperature. A diffusion heat treatment at 846°C for 10 min increases the carbon concentration to 0.70 wt% at a position 1.6 mm below the surface. Estimate the diffusion time required at 630°C to achieve this same concentration also at a 1.6 mm position. Assume that the surface carbon content is the same for both heat treatments, which is maintained constant. The preexponential and activation energy values for the diffusion of carbon in the iron are 7.5 x 107 m²/s and 70.9 kJ/mol, respectively. min
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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