The wear resistance of a steel shaft is to be improved by hardening its surface. This is to be accomplished by increasing the nitrogen content within an outer surface layer as a result of nitrogen diffusion into the steel. The nitrogen is to be supplied from an external nitrogen-rich gas at an elevated and constant temperature. The initial nitrogen content of the steel is 0.002 wt%, whereas the surface concentration is to be maintained at 0.50 wt%. For this treatment to be effective, a nitrogen content of 0.10 wt% must be established at a position 0.40 mm below the surface. Specify appropriate heat treatments in terms of temperature and time for temperatures at 475 ˚C, 500 ˚C and 550 ˚C. The preexponential and activation energy for the diffusion of nitrogen in iron are 3x10-7 m2/s and 76150 J/mol, respectively. 3)
The wear resistance of a steel shaft is to be improved by hardening its surface. This is to be accomplished by increasing the nitrogen content within an outer surface layer as a result of nitrogen diffusion into the steel. The nitrogen is to be supplied from an external nitrogen-rich gas at an elevated and constant temperature. The initial nitrogen content of the steel is 0.002 wt%, whereas the surface concentration is to be maintained at 0.50 wt%. For this treatment to be effective, a nitrogen content of 0.10 wt% must be established at a position 0.40 mm below the surface. Specify appropriate heat treatments in terms of temperature and time for temperatures at 475 ˚C, 500 ˚C and 550 ˚C. The preexponential and activation energy for the diffusion of nitrogen in iron are 3x10-7 m2/s and 76150 J/mol, respectively. 3)
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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The wear resistance of a steel shaft is to be improved by hardening its surface. This is to be accomplished by
increasing the nitrogen content within an outer surface layer as a result of nitrogen diffusion into the steel.
The nitrogen is to be supplied from an external nitrogen-rich gas at an elevated and constant temperature.
The initial nitrogen content of the steel is 0.002 wt%, whereas the surface concentration is to be maintained
at 0.50 wt%. For this treatment to be effective, a nitrogen content of 0.10 wt% must be established at a position
0.40 mm below the surface. Specify appropriate heat treatments in terms of temperature and time for
temperatures at 475 ˚C, 500 ˚C and 550 ˚C. The preexponential and activation energy for the diffusion of
nitrogen in iron are 3x10-7 m2/s and 76150 J/mol, respectively.
3)
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