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The wear resistance of a steel shaft is to be improved by nitrogen hardening of its surface. The initial nitrogen content of steel is 0.002wt%, whereas the surface concentration during heat treatment is maintained at 0.50wt%. A nitrogen content of 0.1wt% is desired at a position of 0.40-mm below the surface a.) Determine the diffusion time required at 600°C. The pre-exponential and activation energy for diffusion of nitrogen in steel is given as 3X10^-7 m²/s and 76.15KJ/mol, respectively. b.) What time will be required at 500°C to produce the same resul (in terms of concentration at a specific depth) as for 10-hours at 600°C?
describe on your own words the three strengthen mechanism for metals i.e. grain size reduction solid solution
In an ore minig operation, a bucket full of ore is suspended from a traveling crane which moves slowly along a stationary bridge. The bucket is to swing no more than 4m horizontally when the crane is brought to a sudden stop. Determine the maximum..
Determine (a) the horizontal line along which the shearing stress is a maximum, (b) the constant k in the following expression for the maximum shearing stress.
the track for a racing event was designed so that riders jump off the slope at 30 degrees from a height of 5 ft. the
block b moves downward with a constant velocity of 20 mms at t0 block a moving upward with a constant acceleration and
1. a process water with a specific heat capacity of 4.182 k.1 kg-i k-1 flows at a rate of 0.050 kg s-i through a heat
five kilograms of water vapor initially at 160 c and 3 bar are cooled at constant pressure until the quality is 0.4.a
the 2.4m wide portion abcd of an inclined cantilevered walk-way is partially supported by members ef and gh. knowing
(a) determine the first three natural frequencies of the tube (b) Draw the standing wave pattern for both pressure and velocity (c) repeat parts a and b if the right one end is attached to an orifice (Hint: consider the impedance of the orifice to..
experiment can be used to investigate heat transfer associated with flow past cylindrical tubes either in isolation or
steam enters an adiabatic turbine at 5 mpa and 500degc with a mass flow rate of 5 kgs and leaves at 100 kpa. the
A small hydroelectric power plant produces electrical power at a rate of 30 kW. The plant utilizes a stream of water that drops 40 m from a lake to the turbine and flows at a rate of 100 kg/s. What is the efficiency of the turbine-generator?
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