Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 5.7, Problem 20AAP
The surface of a steel gear made of 1020 steel (0.20 wt% C) is to be gas carburized at 927°C. Calculate the carbon content at 0.95 mm below the surface of the gear after an 8.0-h carburizing time. Assume the carbon content at the surface of the gear is 1.25 wt%. D (C in γ iron) at 927°C = 1.28 × 10−11 m2/s.
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A flat plug 30 mm thick having an area of 6×10-3 m2 is used to close an opening in a container. The gas O2 at 25 oC and 2 atm pressure is stored inside the container. Assume that the outside partial pressure of O2 is zero and the solubility of O2 is 0.9 m3 gas (at 0 oC and 1 atm) per m3 solid per atm pressure of O2 , and the diffusivity of O2 in the solid material is equal to 0.11×10-10 m2/s.
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Chapter 5 Solutions
Foundations of Materials Science and Engineering
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- An FCC iron–carbon alloy initially containing 0.25wt% C is carburized at an elevated temperature and in an atmosphere wherein thesurface carbon concentration is maintained at 1.0 wt%. If after 55.0 h the concentrationof carbon is 0.35 wt% at a position 5.0 mm below the surface, determine thetemperature at which the treatment was carried out.arrow_forwardCalculate w and ΔE when 1 mole of a liquid is vaporized at its boiling point (80.°C) and 1.00 atm pressure. ΔH for the vaporization of the liquid is 30.7 kJ/mol at 80.°C. Assume the volume of 1 mole of liquid is negligible as compared to the volume of 1 mole of gas at 80.°C and 1.00 atm.arrow_forwardThe diffusion coefficient of nickel in an austenitic stainless steel is 10-22 m2/s at 500°C and 10^-15 m^2/s at 1000°C. Calculate the activation energy for the diffusion of nickel in this alloy over this temperature range.arrow_forward
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