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Calculate D, diffusion coefficient in m^2/s at the soecified temperature tions Determine the carburizing time necess...
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 2.9 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 1180°C. Assume that Do = 5.1 x 10-5 m2/s and Qd-154 krmol. You will find the table below useful. er(z) erf(z)erf(z) 0.55 0.5633 1.3 0.9340 0.025 0.0282 0.60 0.6039 1.4 0.9523...
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...
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.
10. Determine the carburizing time (in seconds) necessary to achieve a carbon concentration of 0.44 wt%...
10. Determine the carburizing time (in seconds) necessary to achieve a carbon concentration of 0.44 wt% at a position 3.0 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 1090°C. Assume that DO = 5.1 x 10-5 m2/s and Qd = 154 kJ/mol. You will find the table below useful. Z erf(z) t erf(z) Z erf(z) 0 0.55 1.3...
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 1.2 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 1260°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(z)z erf(z) 0 0 0.55 0.5633 1.3 0.9340 0.025 0.02820.600.6039 1.4...
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)...
Determine the carburing time (Hour) necessary to achieve a carbon concentration of 0.47 wts at a...
Determine the carburing time (Hour) necessary to achieve a carbon concentration of 0.47 wts at a position 2.2 mm into an on-carbon alloy that initially contains 0.077 wt% C. The surface concentration is to be maintained at 1.2 wt% , and the treatment is to be conducted at 1160°C. Assume that .- 10 x 10 m/s and 0 - 190 kil/mol. 2 0.9523 15 DUM Table 5.1 Tabulation of Error Function Values er) 0 0 0:55 0.5633 0.005 ON 0.6039...
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...
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...
Determine the carburizing time (in s) necessary to achieve a carbon concentration of 0.44 wt% at a position 2.9 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 1180°C. Assume that Do = 5.1 x 10-5 m2/s and Qd-154 krmol. You will find the table below useful. er(z) erf(z)erf(z) 0.55 0.5633 1.3 0.9340 0.025 0.0282 0.60 0.6039 1.4 0.9523...
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...
10. Determine the carburizing time (in seconds) necessary to achieve a carbon concentration of 0.44 wt% at a position 3.0 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 1090°C. Assume that DO = 5.1 x 10-5 m2/s and Qd = 154 kJ/mol. You will find the table below useful. Z erf(z) t erf(z) Z erf(z) 0 0.55 1.3...
Determine the carburizing time (in s) necessary to achieve a carbon concentration of 0.44 wt% at a position 1.2 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 1260°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(z)z erf(z) 0 0 0.55 0.5633 1.3 0.9340 0.025 0.02820.600.6039 1.4...
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)...
Determine the carburing time (Hour) necessary to achieve a carbon concentration of 0.47 wts at a position 2.2 mm into an on-carbon alloy that initially contains 0.077 wt% C. The surface concentration is to be maintained at 1.2 wt% , and the treatment is to be conducted at 1160°C. Assume that .- 10 x 10 m/s and 0 - 190 kil/mol. 2 0.9523 15 DUM Table 5.1 Tabulation of Error Function Values er) 0 0 0:55 0.5633 0.005 ON 0.6039...
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...
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...
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