Question
In: Mechanical Engineering
2. The surface of a 0.1% C steel gears is to be hardened by carburizing. In...
2. The surface of a 0.1% C steel gears is to be hardened by carburizing. In gas carburizing, the gears are placed in an atmosphere that provides 1.2% C at the surface of the steel at a high temperature. Carbon then diffuses from the surface into the gear. For optimum properties, the steel must contain 0.45% C at a depth of 0.2 cm below the surface. Design a carburizing heat treatment schedule that will produce these optimum properties. Assume that the temperature is high enough (at least 900°C) so that the iron has the FCC structure.
Solutions
samet mamat answered 2 years agoRelated Solutions
In the carburizing of 1018 steel... The carbon concentration will be equal to or greater than...
In the carburizing of 1018 steel...
The carbon concentration will be equal to or greater than 18% by
wt 2mm below the surface after 24 hours at 500C.
The carbon concentration will be equal to or less than 0.18% by
wt 2mm below the surface after 24 hours at 500C.
The carbon concentration will be equal to or less than 18% by wt
2mm below the surface after 24 hours at 500C.
The carbon concentration will be equal to or...
The Rockwell hardness of a metal is determined by impressing a hardened point into the surface...
The Rockwell hardness of a metal is determined by impressing a
hardened point into the surface of the metal and then measuring the
depth of penetration of the point. The Rockwell hardness of a
particular alloy is 70. A new annealing process is implemented with
the goal of increasing the Rockwell hardness of the alloy. A test
of 50 samples with the new annealing process resulted in a sample
mean of 72.1 and a sample standard deviation of 5.
Does...
The Rockwell hardness of a metal is determined by impressing a hardened point into the surface...
The Rockwell hardness of a metal is determined by impressing a
hardened point into the surface of the metal and then measuring the
depth of penetration of the point. Suppose the Rockwell hardness of
a particular alloy is normally distributed with mean 71 and
standard deviation 3.
a)If a specimen is acceptable only if its hardness is between 70
and 74, what is the probability that a randomly chosen specimen has
an acceptable hardness? (Round your answer to four decimal...
U.S. Steel is considering a plant expansion to produce austenitic, precipitation hardened, duplex, and martensitic stainless...
U.S. Steel is considering a plant expansion to produce
austenitic, precipitation hardened, duplex, and martensitic
stainless steel round bars that is expected to cost $15 million now
and another $10 million 1 year from now. If total operating costs
will be $1.5 million per year starting 1 year from now, and the
estimated salvage value of the plant is virtually zero, how much
must the company make annually in years 1 through 8 to recover its
investment plus a return...
U.S. Steel is considering a plant expansion to produce austenitic, precipitation hardened, duplex, and martensitic stainless...
U.S. Steel is considering a plant expansion to produce
austenitic, precipitation hardened, duplex, and martensitic
stainless steel round bars that is expected to cost $13 million now
and another $10 million 1 year from now. If total operating costs
will be $1.5 million per year starting 1 year from now, and the
estimated salvage value of the plant is virtually zero, how much
must the company make annually in years 1 through 10 to recover its
investment plus a return...
Three objects, cylindrical rod (radius = 0.1 m), steel ball (radius = 0.1 m) and flat...
Three objects, cylindrical rod (radius = 0.1 m), steel ball
(radius = 0.1 m) and flat screen (length = 0.1 m) with surface
temperature of 65 ℃ are exposed in perpendicular direction to water
flow at 30 m/s and 30 ℃. Assume the area of all three objects are
the same as 1 m2 , determine the individual values of convective
heat transfer coefficient for each object, and their respective
heat loss.
Surface roughness of steel is investigated. The method of surface manufacturing largely determines roughness of the...
Surface roughness of steel is investigated. The method of
surface manufacturing largely determines roughness of the surface.
One of the parameters to describe the roughness is Rz, the maximum
height of the surface irregularities profile. Rz (in μm) is
measured for 21 random places on the surface of forged details and
21 random places on the surface of casted details. Is there
evidence to support the claim that the surface of forged steel has
a larger surface roughness variance than...
Environmental lapse rate = 0.1 degree C/100m upto 100 m altitude (surface temperature drop at nighttime)....
Environmental lapse rate = 0.1 degree C/100m upto 100
m altitude (surface temperature drop at nighttime).
Environmental lapse rate = -0.7 degree C/100m after
100 m altitude
The adiabatic lapse rate is based on moist air.
Find the atmospheric condition from the example
below.
a) Mixed radiational inversion
b) Radiational inversion
c) Subsidentail inversion
d) Frontal inversion
e) Advective inversion
Will upvote, thanks in advance
The Specialty Steel Products Company produces items, such as machine tools, gears, automobile parts, and other...
The Specialty Steel Products Company produces items, such as
machine tools, gears, automobile parts, and other specialty items,
in small quantities to customer order. Because the products are so
diverse, demand is measured in machine-hours. Orders for products
are translated into required machine-hours, based on time standards
for each operation. Management is concerned about capacity in the
lathe department.
Assemble the data necessary to analyze the addition of one more
lathe machine and operator.
Historical records indicate that lathe department...
A single-tooth hardened-steel worm has a catalog rating of 2000 W at 600 rev/min when meshed...
A single-tooth hardened-steel worm has a catalog rating of 2000
W at 600 rev/min when meshed with a 48-tooth cast-iron gear. The
axial pitch of the worm is 25 mm, the normal pressure angle is
14.5°, the pitch diameter of the worm is 100 mm, and the face
widths of the worm and gear are, respectively, 100 mm and 50 mm.
Determine the three components of the load on the worm.
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