Problem 2 Consider the gas carburizing of a gear 1020 steel at 927°C. Calculate the time (in minute) necessary to increase the carbon content to 0.40 wt% at 0.5 mm below the surface. Assume that the carbon content at the surface 0.9 wt% and that the steel has a nominal carbon content of 0.2 wt%. Given: Diffusivity of C in Fe at 9270C is 1.28 x 10-11 m²s-1, activation energy is 148 kJmol-1, gas constant is 8.31 Jmol-1K-1, if erf (Z) = 0.7143, Z = 0.755. %3D
Problem 2 Consider the gas carburizing of a gear 1020 steel at 927°C. Calculate the time (in minute) necessary to increase the carbon content to 0.40 wt% at 0.5 mm below the surface. Assume that the carbon content at the surface 0.9 wt% and that the steel has a nominal carbon content of 0.2 wt%. Given: Diffusivity of C in Fe at 9270C is 1.28 x 10-11 m²s-1, activation energy is 148 kJmol-1, gas constant is 8.31 Jmol-1K-1, if erf (Z) = 0.7143, Z = 0.755. %3D
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:Problem 2
Consider the gas carburizing of a gear 1020 steel
at 927°C. Calculate the time (in minute) necessary
to increase the carbon content to 0.40 wt% at 0.5
mm below the surface. Assume that the carbon
content at the surface 0.9 wt% and that the steel
has a nominal carbon content of 0.2 wt%. Given:
Diffusivity of C in Fe at 9270C is 1.28 x 10-11 m²s-1,
activation energy is 148 kJmol-1, gas constant is
8.31 Jmol-1K-1, if erf (Z) = 0.7143, Z = 0.755.
%3D
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