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1. Briefly cite the differences between pearlite, bainite, and spheroidite relative to micro structure and mechanical properties.
2. What is the driving force for the formation of spheroidite?
3. Using the isothermal transformation dia- gram for an iron-carbon alloy of eutectoid composition (Figure 10.22), specify the na- ture of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure.
(a) Cool rapidly to 350°C (660°F), hold for reciprocal of temperature (in K-1), and 103s, then quench to room temperature. Determine the activation energy for this recrystallization process. (See Section 5.5.)
(c) By extrapolation, estimate the length of time required for 50% recrystallization at room temperature, 20°C (293 K).
a nominal 2 x 8 board 12 ft long is made of msr 2250-1.9e lumber and carries a compressive load of 15.5 kip parrellel
a heat engine whose thermal efficiency is 40 percent uses a hot reservoir at 700 k and a cold reservoir at 280 k. a
air flows through a well-insulated nozzle operating at steady state. at the inlet the pressure is 5 bar the temperature
a ship travels 40km. on course of 17 degree south of east and then travels 90km. on course 50degree west of south. find
in a steam power plant which utilizes rankine cycle steam enters the turbine at 100 bar and 400oc. it expands with an
Disregarding heat conduction through the shaft and assuming one-dimensional heat transfer, determine (a) the rate of heat transfer to the coolant, (b) the surface temperature of the shaft, and (c) the mechanical power wasted by the viscous dissipa..
The 500-lb ram of a pile drive falls 4 ft from rest and strikes the top of an 800 lb pile embedded 3 ft in the ground. Immediately after impact the ram is seen to have no velocity. Determine the coefficient of restitution e and the velocity v of the ..
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argon gas enters a adiabatic compressor at 20psia and 90 f with a velocity of 60 fts and it exits at 200 psi and 240
Argon enters a pipe at 100 kPa and 27oC and is compressed (via a compressor. meaning work is being done on the system) in an adiabatic, steady flow process to 200 kPa abd 100oC at the exit. Calculate the work required for this process in KJ/kg.
Consider a concentric pipe with inner radius of Rin and outer radius of Rout. The flow is laminar and in the direction of the axis of the pipes. Obtain the velocity profile for this geometry, u(r); and also expressions for the maximum velocity, the m..
zoologists estimate that the average adult cheetah can run at a speed of 100 kmhr and that the average antelope can run
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