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 will be maintained at 0.45 wt%. For this treatment to be effective, nitrogen content of 0.12 wt% must be established at a position 0.45 mm below the surface. Design an appropriate heat treatment in terms of temperature between 475°C and 625A°C and time Use Do = 3.0 x 10-7m2/s and Q= 76,150 J/mol.
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 will be maintained at 0.45 wt%. For this treatment to be effective, nitrogen content of 0.12 wt% must be established at a position 0.45 mm below the surface. Design an appropriate heat treatment in terms of temperature between 475°C and 625A°C and time Use Do = 3.0 x 10-7m2/s and Q= 76,150 J/mol.
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