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![Initial concentration co= 0.2 wt% Surface Concentration. CG= 1 ut fc Concentration at Some depth cx = 0.6 wtfc Depth (3] = 1](http://img.homeworklib.com/questions/cddfa280-bf6c-11ea-a3a4-633bae672d1f.png?x-oss-process=image/resize,w_560)
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3. For the carburization process in problem #2 above the surface carbon concentration is at 1.0...
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...
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...
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...
Bonus Problem (worth 5 extra points.) You must show all your work to receive credit! 26. You are asked to improve t...
Bonus Problem (worth 5 extra points.) You must show all your work to receive credit! 26. You are asked to improve the hardness (and strength) of a steel sample by "carburization" process. The initial carbon content (co) of the sample is 0.2 wt %. You are using a carbon rich environment (hydro- carbon gas) to set the surface-carbon content (c) at 1.0 wt %. Using the Figure 5.11, calculate the required carburization temperature to reach a carbon content of 0.4...
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 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) =
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
Please answer all the three questions.. Please please 7. (8 points) Carburization is an industrial process...
Please answer all the three questions.. Please please
7. (8 points) Carburization is an industrial process to harden steel components through diffusion. It is done at elevated temperature because a. Steels have high yield strength b. Catoms can penetrate into the component's surface through vacancy diffusion c. Catoms can penetrate into the component's surface through interstitial diffusion d. Diffusivity is high at elevated temperature 8. (15 Points) The bonding energy Ex between two atoms is a function of interatomic distance...
Bonus Problem (worth 5 extra points.) You must show all your work to receive credit! 27. The initial carbon content...
Bonus Problem (worth 5 extra points.) You must show all your work to receive credit! 27. The initial carbon content (Co) of the sample is 0.2 wt %. You are using a carbon rich environment (hydro-carbon gas) to set the surface-carbon content (c) at 1.0 wt %. Using the Figure 5.11 (No need to use Error Function), calculate how long it would take at 1500 degree C to reach a carbon content of 0.4 wt % at a distance of...
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...
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...
Bonus Problem (worth 5 extra points.) You must show all your work to receive credit! 26. You are asked to improve the hardness (and strength) of a steel sample by "carburization" process. The initial carbon content (co) of the sample is 0.2 wt %. You are using a carbon rich environment (hydro- carbon gas) to set the surface-carbon content (c) at 1.0 wt %. Using the Figure 5.11, calculate the required carburization temperature to reach a carbon content of 0.4...
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...
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
Please answer all the three questions.. Please please
7. (8 points) Carburization is an industrial process to harden steel components through diffusion. It is done at elevated temperature because a. Steels have high yield strength b. Catoms can penetrate into the component's surface through vacancy diffusion c. Catoms can penetrate into the component's surface through interstitial diffusion d. Diffusivity is high at elevated temperature 8. (15 Points) The bonding energy Ex between two atoms is a function of interatomic distance...
Bonus Problem (worth 5 extra points.) You must show all your work to receive credit! 27. The initial carbon content (Co) of the sample is 0.2 wt %. You are using a carbon rich environment (hydro-carbon gas) to set the surface-carbon content (c) at 1.0 wt %. Using the Figure 5.11 (No need to use Error Function), calculate how long it would take at 1500 degree C to reach a carbon content of 0.4 wt % at a distance of...
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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