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9, carbon is diffused into a 1020 steel (0.2 wt% C) for 2 hours at 950°C The surface concentratio...
1) You find that carbon takes 259 s to diffuse to a concentration of 0.5 wt%...
1) You find that carbon takes 259 s to diffuse to a concentration of 0.5 wt% at a depth of 0.1 mm in BCC iron if the intitial concentration is 0.2 wt% and the surface is maintained at 1 wt% at 863 K. At temperature 888 what diffusion time will be needed? 2) You find that carbon takes 553 s to diffuse to a concentration of 0.5 wt% at a depth of 0.1 mm in BCC iron if the intitial...
3. For the carburization process in problem #2 above the surface carbon concentration is at 1.0...
3. For the carburization process in problem #2 above the surface carbon concentration is at 1.0 wt% C. The initial carbon concentration of the steel is 0.2 wt%. Calculate how long it will take at 10000C to reacha carbon concentration of 0.6 wt% at a distance of 1 mm from the surface. Assume this is a semi-infinite solid. region. The density of y-iron (FCC) at 1000°C is 7.63 g/cm3, Do = 20x106 m2/s; Q = 142,000 J/mol
Nitrogen is sometimes diffused into the surface of a steel component in a process called case...
Nitrogen is sometimes diffused into the surface of a steel component in a process called case hardening. Consider a sheet of steel (1.416x10A0) mm thick which has nitrogen atmospheres on both sides at a temperature of 1200°C. The system is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is (6.735x10A-11) m2/s. The diffusion flux is found to be (2.52x10A-7) kg/m2-s. It is also known that the concentration of nitrogen at the...
Find the carbon concentration which can be achieved after 19.7 h at a position 2 mm...
Find the carbon concentration which can be achieved after 19.7 h
at a position 2 mm of a
-iron/carbon alloy with initial concentration of 0.2 wt% C. The
concentration in the surface is maintained at 1.30 wt% C, and the
treatment is conducted at 1000 °C. For diffusion coefficient, use
the diffusion data for
-Fe in Table 6.2 in the textbook.
z
erf(z)
0.85
0.7707
0.90
0.7970
All J. (43 points). Consider the gas carburizing of a gear of plain carbon 1020 steel...
All
J. (43 points). Consider the gas carburizing of a gear of plain carbon 1020 steel at 927°C (1700 ). Assume that the carbon content at the surface is 0.90% and that the steel has a nominal carbon content of 0.2%. The diffusivity (diffusion coefficient) is given as D927°c = 1.28x10-m²/s. 3.1 The error function is a. ert (2010.) = 0.71429 b. er 21 .= 0.63547 c. erfo =0.63547d. None of the above 3.2 The time in hours necessary to...
Non-steady state diffusion: Plot the carbon concentration graph as a function of distance from the edge...
Non-steady state diffusion: Plot the carbon concentration graph as a function of distance from the edge of the 1018 carbon steel which is carburized in an environment with 1.3 wt% surface carbon content for 2 hours at 900 C. Please show work, thank you!
In the carburizing process the steel piece was exposed, at an elevated temperature (900 °C), to...
In the carburizing process the steel piece was exposed, at an elevated temperature (900 °C), to an atmosphere rich in a hydrocarbon gas, such as methane CH Surface concentration of carbon is to be maintained at 1.18 wt%. Determine the time (in hours) necessary to achieve a carbon content of 0 68 wt% at a position 0.8 mm below the surface. Initial carbon concentration is 0 18 wt% Take the diffusion coefficient for carbon in iron at 900°C = 1.0...
No. 5 (20 points) (a) Determine the time necessary to achieve a carbon concentration of 0.30 wt.% at a position of 4 mm...
No. 5 (20 points) (a) Determine the time necessary to achieve a carbon concentration of 0.30 wt.% at a position of 4 mm into an iron-carbon alloy that initially contains 0.10 wt. % C. The surface concentration is to be maintained at 0.90 wt.% C, and the diffusion coefficient of C is 7.0 x 10-11 m2/sec. (10 points) (b) The diffusion coefficient of Ni in a stainless steel (fcc) is 1 x 1022 m2/sec at 500°C and 1 x 10-15...
UTVER VIS Concentration of Nitrogen (wt%): = 0.21 Position in mm= 7.2 Diffusion Coefficient for Nitrogen...
UTVER VIS Concentration of Nitrogen (wt%): = 0.21 Position in mm= 7.2 Diffusion Coefficient for Nitrogen in Iron at 700°C -8.90E-10 Nitrogen in Iron Heat Treatment Time (hours): = 8 Carburizing Time (hrs): = 7 Steel Alloy Case Depth (mm): 4.8 Steel Alloy New Case Depth (mm) - 9.9 Activation Energy kJ/mol: = 103 Temperature for Problem 3 (Celsius) -809 . Data for Problem 4 Temperature in C: -595 Diffusivity (m2/s) = 5.62E-14 Temperature in C: -702 Diffusivity (m /s)...
2. Assume you have carbon diffusing into an a-Fe host metal. The diffusion occurs at 900...
2. Assume you have carbon diffusing into an a-Fe host metal. The diffusion occurs at 900 C for The initial concentration of carbon in the host metal is 0.1 wt%. The surface 20,00 cs. concentration of the carbon will be maintained at 1.2 wt%. After 20,000 seconds, what will the concentration of carbon in the host metal be at 2 mm from the surface?
3. For the carburization process in problem #2 above the surface carbon concentration is at 1.0 wt% C. The initial carbon concentration of the steel is 0.2 wt%. Calculate how long it will take at 10000C to reacha carbon concentration of 0.6 wt% at a distance of 1 mm from the surface. Assume this is a semi-infinite solid. region. The density of y-iron (FCC) at 1000°C is 7.63 g/cm3, Do = 20x106 m2/s; Q = 142,000 J/mol
Nitrogen is sometimes diffused into the surface of a steel component in a process called case hardening. Consider a sheet of steel (1.416x10A0) mm thick which has nitrogen atmospheres on both sides at a temperature of 1200°C. The system is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is (6.735x10A-11) m2/s. The diffusion flux is found to be (2.52x10A-7) kg/m2-s. It is also known that the concentration of nitrogen at the...
Find the carbon concentration which can be achieved after 19.7 h
at a position 2 mm of a
-iron/carbon alloy with initial concentration of 0.2 wt% C. The
concentration in the surface is maintained at 1.30 wt% C, and the
treatment is conducted at 1000 °C. For diffusion coefficient, use
the diffusion data for
-Fe in Table 6.2 in the textbook.
z
erf(z)
0.85
0.7707
0.90
0.7970
All
J. (43 points). Consider the gas carburizing of a gear of plain carbon 1020 steel at 927°C (1700 ). Assume that the carbon content at the surface is 0.90% and that the steel has a nominal carbon content of 0.2%. The diffusivity (diffusion coefficient) is given as D927°c = 1.28x10-m²/s. 3.1 The error function is a. ert (2010.) = 0.71429 b. er 21 .= 0.63547 c. erfo =0.63547d. None of the above 3.2 The time in hours necessary to...
In the carburizing process the steel piece was exposed, at an elevated temperature (900 °C), to an atmosphere rich in a hydrocarbon gas, such as methane CH Surface concentration of carbon is to be maintained at 1.18 wt%. Determine the time (in hours) necessary to achieve a carbon content of 0 68 wt% at a position 0.8 mm below the surface. Initial carbon concentration is 0 18 wt% Take the diffusion coefficient for carbon in iron at 900°C = 1.0...
No. 5 (20 points) (a) Determine the time necessary to achieve a carbon concentration of 0.30 wt.% at a position of 4 mm into an iron-carbon alloy that initially contains 0.10 wt. % C. The surface concentration is to be maintained at 0.90 wt.% C, and the diffusion coefficient of C is 7.0 x 10-11 m2/sec. (10 points) (b) The diffusion coefficient of Ni in a stainless steel (fcc) is 1 x 1022 m2/sec at 500°C and 1 x 10-15...
UTVER VIS Concentration of Nitrogen (wt%): = 0.21 Position in mm= 7.2 Diffusion Coefficient for Nitrogen in Iron at 700°C -8.90E-10 Nitrogen in Iron Heat Treatment Time (hours): = 8 Carburizing Time (hrs): = 7 Steel Alloy Case Depth (mm): 4.8 Steel Alloy New Case Depth (mm) - 9.9 Activation Energy kJ/mol: = 103 Temperature for Problem 3 (Celsius) -809 . Data for Problem 4 Temperature in C: -595 Diffusivity (m2/s) = 5.62E-14 Temperature in C: -702 Diffusivity (m /s)...
2. Assume you have carbon diffusing into an a-Fe host metal. The diffusion occurs at 900 C for The initial concentration of carbon in the host metal is 0.1 wt%. The surface 20,00 cs. concentration of the carbon will be maintained at 1.2 wt%. After 20,000 seconds, what will the concentration of carbon in the host metal be at 2 mm from the surface?
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