MECH 210 –Materials Science and Engineering Assignment 04, Spring 2021due Monday (3/8)9:05AM1.
Hydrogen gas can be purified by diffusion through a palladium sheet. If the concentrations on the two sides of a 5-mm-thick palladium sheet are 2.4 and 0.6 kg/m3, and steady-state conditions have been attained, compute the mass of hydrogen, in kg per hour, that passes through the palladium sheet at 500C. The diffusion coefficient of hydrogen in palladium is 1.0 x 108m2/s and the surface area of the palladium sheet is 0.50 m2.2.Consider the gas carburizing of a gear of 1018 steel at 927C.
Calculate the time necessary to increase the carbon concentration to 0.35 wt% at 0.40 mm below the surface of the gear.The gas mixture contains a constant 1.15 wt% C.3.A gear made of 1020 steel is to be gas carburized at 930C.
What is the carbon concentration at 0.95 mm below the surface of the gear after 8.0 hours of carburizing time? Iron is phase at 930C. The gas mixture contains 1.25 wt% C.4.A 1045 steel will be heat treated in air at 900C.
What is the carbon concentration at 0.4 mm below the surface after 6 hours?5.At approximately what temperature would a specimen of -iron have to be carburized for 2 hours to produce the same diffusion result as at 900C for 15 hours?
