subject
Engineering, 20.07.2019 00:10 jolleyrancher78

Gears are to be subjected to the process of gas carburizing in which ch4 disassociates at the metal surface and the c diffuses into the steel forming a thin carbon-rich layer which can then be hardened by appropriate heat treatment. the gears are of steel, originally containing 0.17% c. the diffusion coefficient (do) for carbon in austenite is 0.21 sq cm/sed and the activation energy is33.8 kcal/mole. the process is maintained at a temperature of 975°c.. if the surface of the metal is maintained at a carbon content of 1.1 per cent, what will be the time required to increase the carbon content 0.5 mm below the surface to 0.5 per cent? what will be the carbon content 1.5 mm below the surface at that time?

ansver
Answers: 1

Another question on Engineering

question
Engineering, 04.07.2019 18:10
The higher the astm grain-size number, the coarser the grain is. a)-true b)-false
Answers: 3
question
Engineering, 04.07.2019 18:10
Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.
Answers: 1
question
Engineering, 04.07.2019 18:20
Derive the correction factor formula for conical nozzle i=-(1+ cosa) and calculate the nozzle angle correction factor for a nozzle whose divergence hal-fangle is 13 (hint: assume that all the mass flow originates at the apex of the cone.
Answers: 3
question
Engineering, 04.07.2019 19:10
Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?
Answers: 3
You know the right answer?
Gears are to be subjected to the process of gas carburizing in which ch4 disassociates at the metal...
Questions
question
Mathematics, 13.03.2020 05:03
question
Mathematics, 13.03.2020 05:03