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 concentration is 0.2 wt% and the surface is maintained at 1 wt% at 918 K. For a diffusion time of 603 seconds, what diffusion temperature in K will be needed?
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1) You find that carbon takes 259 s to diffuse to a
concentration of 0.5 wt%...
In carburizing an alloy that initially has a uniform carbon concentration of .25 wt% and is...
In carburizing an alloy that initially has a uniform carbon concentration of .25 wt% and is to be treated at 1223 K, if the concentration of carbon at the surface is suddenly brought to and maintained at 1.20 wt%, how long will it take to achieve a carbon content of 0.80 wt% at a position of 0.5 mm below the surface? The diffusion coefficient for carbon in iron at this temperature is 1.6 x 10-11 m 2 /s.
A-For a carburization process taking place at 779.9 K, use the standard BCC iron activation energ...
A-For a carburization process taking place at 779.9 K, use the standard BCC iron activation energy and diffusion constant to calculate the time needed to reach a concentration of 0.4 at a depth of 64 micrometers, if the initial carbon concentration of the steel is 0.1 wt% and the imposed surface concentration is equivalent to 1.2 wt%. b- For a carburization process taking place over 412 seconds, use the standard BCC iron activation energy and diffusion constant to calculate the...
For a carburization process taking place over 193 seconds, use the standard BCC iron activation energy...
For a carburization process taking place over 193 seconds, use the standard BCC iron activation energy and diffusion constant to calculate the temperature in K needed to reach a concentration of 0.5 at a depth of 48 micrometers, if the initial carbon concentration of the steel is 0.1 wt% and the imposed surface concentration is equivalent to 1.5 wt%.
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...
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
9, carbon is diffused into a 1020 steel (0.2 wt% C) for 2 hours at 950°C The surface concentratio...
9, carbon is diffused into a 1020 steel (0.2 wt% C) for 2 hours at 950°C The surface concentration for carbon is 1 wt%. Plot the carbon concentration distance for 0 to 0.5 mm. Note: Use the carbon diffusion data for y-Fe.
9, carbon is diffused into a 1020 steel (0.2 wt% C) for 2 hours at 950°C The surface concentration for carbon is 1 wt%. Plot the carbon concentration distance for 0 to 0.5 mm. Note: Use the carbon...
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?
Determine the carburizing time necessary to achieve a carbon concentration of 0.48 wt% at a position...
Determine the carburizing time necessary to achieve a carbon concentration of 0.48 wt% at a position 3.2 mm into an iron-carbon alloy that initially contains 0.20 wt% C. The surface concentration is to be maintained at 1.0 wt% C, and the treatment is to be conducted at 1070°C. Assume that D0 = 2.2 × 10-5 m2/s and Qd = 173 kJ/mol. The following table may be useful. om Equation 6.5 calculate the Gaussian error function: erf(x2Dt) =
Determine the carburizing time (in s) necessary to achieve a carbon concentration of 0.44 wt% at...
Determine the carburizing time (in s) necessary to achieve a carbon concentration of 0.44 wt% at a position 1.4 mm into an iron-carbon alloy that initially contains 0.031 wt% C. The surface concentration is to be maintained at 1.2 wt% C, and the treatment is to be conducted at 1130°C. Assume that Do -5.1 x 10-5 m2/s and Qd 154 kJ/mol. You will find the table below useful. erf(z) erf(2)z erf(z) 5633 1.3 0.9340 0.025 0.0282 0.60 0.6039 1.4 0.9523...
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...
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
9, carbon is diffused into a 1020 steel (0.2 wt% C) for 2 hours at 950°C The surface concentration for carbon is 1 wt%. Plot the carbon concentration distance for 0 to 0.5 mm. Note: Use the carbon diffusion data for y-Fe.
9, carbon is diffused into a 1020 steel (0.2 wt% C) for 2 hours at 950°C The surface concentration for carbon is 1 wt%. Plot the carbon concentration distance for 0 to 0.5 mm. Note: Use the carbon...
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?
Determine the carburizing time (in s) necessary to achieve a carbon concentration of 0.44 wt% at a position 1.4 mm into an iron-carbon alloy that initially contains 0.031 wt% C. The surface concentration is to be maintained at 1.2 wt% C, and the treatment is to be conducted at 1130°C. Assume that Do -5.1 x 10-5 m2/s and Qd 154 kJ/mol. You will find the table below useful. erf(z) erf(2)z erf(z) 5633 1.3 0.9340 0.025 0.0282 0.60 0.6039 1.4 0.9523...
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