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For a steel alloy it has been determined that a carburizing heat treatment of 16 h duration at 763°C will raise the carbon concentration to 0.53 wt% at a point 3.1 mm from the surface. Estimate the time necessary to achieve the same concentration at a 8.7 mm position for an identical steel and at a carburizing temperature of 1070°C. Assume that Do is 4.3 x 10 4 m2/s and Qa is 104 kJ/mol. i h

For a steel alloy it has been determined that a carburizing heat treatment of 16 h duration at 763°C will raise the carbon concentration to 0.53 wt% at a point 3.1 mm from the surface. Estimate the time necessary to achieve the same concentration at a 8.7 mm position for an identical steel and at a carburizing temperature of 1070°C. Assume that Do is 4.3 x 10 4 m2/s and Qa is 104 kJ/mol. i h

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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For a steel alloy it has been determined that a carburizing heat treatment of 16 h duration at 763°C will raise the carbon concentration to 0.53 wt% at a point 3.1 mm from the surface. Estimate the time necessary to achieve the same concentration at a 8.7 mm position for an identical steel and at a carburizing temperature of 1070°C. Assume that Do is 4.3 x 10 4 m2/s and Qa is 104 kJ/mol. i h The purification of hydrogen gas is possible by diffusion through a thin palladium sheet. Calculate the number of kilograms of hydrogen that pass per hour (in kg/h) through a 3.0-mm thick sheet of palladium having an area of 0.25 m2 at 500°C. Assume a diffusion coefficient of 6.0 x 10-8 m²/s, that the concentrations at the high- and low-pressure sides of the plate are 5.1 and 0.34 kg/m³ (kilogram of hydrogen per cubic meter of palladium), and that steady- state conditions have been attained. i kg/h
Transcribed Image Text:For a steel alloy it has been determined that a carburizing heat treatment of 16 h duration at 763°C will raise the carbon concentration to 0.53 wt% at a point 3.1 mm from the surface. Estimate the time necessary to achieve the same concentration at a 8.7 mm position for an identical steel and at a carburizing temperature of 1070°C. Assume that Do is 4.3 x 10 4 m2/s and Qa is 104 kJ/mol. i h The purification of hydrogen gas is possible by diffusion through a thin palladium sheet. Calculate the number of kilograms of hydrogen that pass per hour (in kg/h) through a 3.0-mm thick sheet of palladium having an area of 0.25 m2 at 500°C. Assume a diffusion coefficient of 6.0 x 10-8 m²/s, that the concentrations at the high- and low-pressure sides of the plate are 5.1 and 0.34 kg/m³ (kilogram of hydrogen per cubic meter of palladium), and that steady- state conditions have been attained. i kg/h
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