Table Error function (erf) values erf (z) erf (2) erf (z) 0.55 0.5033 13 0.9340 0.025 0.0282 O 60 0.6039 14 0.9523 0.05 0.0564 0.05 0 6420 15 0.9001 0.10 0 1125 0.70 0 6778 16 0.9763 0.15 0.1080 0.75 0.7112 17 0.9838 0 20 0.2227 0.80 0.7421 18 0.0091 025 0 2703 0.85 0.7707 1.9 0.0028 0.30 0.3290 0.90 0.7969 20 0 9953 0.35 0.3704 0.95 0.8209 22 LOGG O O 8427 O 8802 040 0.4284 1.0 24 0.9903 045 0.4755 1.1 2.6 0.0098 O 50 0.5205 12 0.9103 28 0.9900 A 1010 steel is to be carburized using a gas atmosphere that produces 1.0% Cat the surface of the steel. The case depth is defined as the distance below the surface that contains at least 0.5% Č. If carburizing is done at 1000°C, determine the time required to produce a case depth of 0 234 mm. For the diffusion of carbon in FCC iron Q - 137.7 kJ/mol and Do = 0.23 x 10 m²/s. The gas constant is R- 8.314 J/(mol - K). Assume that the diffusion coefficient D remains constant and the concentrations of the diffusing atoms at the surface (c.) and at large distance (z) within the material (co) remain unchanged. Assume a 1010 steel contains 0.10% C. Use the table for error function values as needed. (Express your answer to three significant figures.) h

Table Error function (erf) values erf (z) erf (2) erf (z) 0.55 0.5033 13 0.9340 0.025 0.0282 O 60 0.6039 14 0.9523 0.05 0.0564 0.05 0 6420 15 0.9001 0.10 0 1125 0.70 0 6778 16 0.9763 0.15 0.1080 0.75 0.7112 17 0.9838 0 20 0.2227 0.80 0.7421 18 0.0091 025 0 2703 0.85 0.7707 1.9 0.0028 0.30 0.3290 0.90 0.7969 20 0 9953 0.35 0.3704 0.95 0.8209 22 LOGG O O 8427 O 8802 040 0.4284 1.0 24 0.9903 045 0.4755 1.1 2.6 0.0098 O 50 0.5205 12 0.9103 28 0.9900 A 1010 steel is to be carburized using a gas atmosphere that produces 1.0% Cat the surface of the steel. The case depth is defined as the distance below the surface that contains at least 0.5% Č. If carburizing is done at 1000°C, determine the time required to produce a case depth of 0 234 mm. For the diffusion of carbon in FCC iron Q - 137.7 kJ/mol and Do = 0.23 x 10 m²/s. The gas constant is R- 8.314 J/(mol - K). Assume that the diffusion coefficient D remains constant and the concentrations of the diffusing atoms at the surface (c.) and at large distance (z) within the material (co) remain unchanged. Assume a 1010 steel contains 0.10% C. Use the table for error function values as needed. (Express your answer to three significant figures.) h

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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