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• Consider one such alloy that initially has a uniform carbon concentration of 0.25 wt% and is to be treated at 950C. If the concentration of carbon at the surface is suddenly brought to 0.05 and maintained at 1.20 wt%, how long will it take to achieve a carbon content of 0.80 wt% at a position 0.5 mm below the surface? The diffusion coefficient for carbon in iron at this temperature is and 5.3 · 10-11 m²/s; assume that the steel piece is semi-infinite. erf(z) erf(z) 0,5633 erf(z) 0.55 1.3 0,9340 0.025 0.0282 0.60 0.6039 1.4 0,9523 0,0564 0.65 0,6420 1.5 0.9661 0.10 0.1125 0.70 0.6778 1.6 0.9763 0.15 0.1680 0.75 0.7112 1.7 0.9838 0,20 0.2227 0.80 0.7421 1.8 0.9891 0.25 0,2763 0.85 0.7707 1.9 0.9928 0.30 0.3286 0.90 0.7970 2.0 0.9953 0.35 0.3794 0.95 0.8209 2.2 0.9981 0,40 0,4284 1.0 0.8427 2.4 0,9993 0,45 0.4755 1.1 0.8802 2.6 0.9998 0.50 0.5205 1.2 0.9103 2.8 0.9999

• Consider one such alloy that initially has a uniform carbon concentration of 0.25 wt% and is to be treated at 950C. If the concentration of carbon at the surface is suddenly brought to 0.05 and maintained at 1.20 wt%, how long will it take to achieve a carbon content of 0.80 wt% at a position 0.5 mm below the surface? The diffusion coefficient for carbon in iron at this temperature is and 5.3 · 10-11 m²/s; assume that the steel piece is semi-infinite. erf(z) erf(z) 0,5633 erf(z) 0.55 1.3 0,9340 0.025 0.0282 0.60 0.6039 1.4 0,9523 0,0564 0.65 0,6420 1.5 0.9661 0.10 0.1125 0.70 0.6778 1.6 0.9763 0.15 0.1680 0.75 0.7112 1.7 0.9838 0,20 0.2227 0.80 0.7421 1.8 0.9891 0.25 0,2763 0.85 0.7707 1.9 0.9928 0.30 0.3286 0.90 0.7970 2.0 0.9953 0.35 0.3794 0.95 0.8209 2.2 0.9981 0,40 0,4284 1.0 0.8427 2.4 0,9993 0,45 0.4755 1.1 0.8802 2.6 0.9998 0.50 0.5205 1.2 0.9103 2.8 0.9999

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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E 22_Mat_Eng_Test_09_FeCph x po 22_Mat_Eng_Test_08_phase x Po 22_Mat_Eng_Test_10_phase X po 22_Mat_Eng_Test_10_phase × 22_Mat_Eng_Test_07_diffusi x P 22_Mat_Eng_Test_07_diffusi x O File | C:/Users/Asus/Downloads/material/22_Mat_Eng_Test_07_diffusion_23_03.pdf ++ D Page view A Read aloud T Add text V Draw E Highlight O Erase 03 19 of 25 ZJatt Problem for chocolate MÚEGYETEM 1 7 8 2 • Consider one such alloy that initially has a uniform carbon concentration of 0.25 wt% and is to be treated at 950C. If the concentration of carbon 0.025 at the surface is suddenly brought to 0.05 and maintained at 1.20 wt%, how long will it take to achieve a carbon content of 0.80 wt% at a position 0.5 mm below the surface? The diffusion coefficient for carbon in iron at this temperature is and 5.3 · 10-11 m²/s; assume that the steel piece is semi-infinite. erf(z) erf(z) erf(z) 0.55 0.5633 1.3 0.9340 0.0282 0.60 0.6039 1.4 0.9523 0.0564 0.65 0.6420 1.5 0.9661 0.10 0.1125 0.70 0.6778 1.6 0.9763 0.15 0.1680 0.75 0.7112 1.7 0.9838 0.20 0.2227 0.80 0.7421 1.8 0.9891 0.25 0.2763 0.85 0.7707 1.9 0.9928 0.30 0.3286 0.90 0.7970 2.0 0.9953 0.35 0.3794 0.95 0.8209 2.2 0.9981 0.40 0.4284 1.0 0.8427 2.4 0.9993 0.45 0.4755 1.1 0.8802 2.6 0.9998 0.50 0.5205 1.2 0.9103 2.8 0.9999 68°F ENG 9:33 PM gb Cloudy US 5/10/2022 +
Transcribed Image Text:E 22_Mat_Eng_Test_09_FeCph x po 22_Mat_Eng_Test_08_phase x Po 22_Mat_Eng_Test_10_phase X po 22_Mat_Eng_Test_10_phase × 22_Mat_Eng_Test_07_diffusi x P 22_Mat_Eng_Test_07_diffusi x O File | C:/Users/Asus/Downloads/material/22_Mat_Eng_Test_07_diffusion_23_03.pdf ++ D Page view A Read aloud T Add text V Draw E Highlight O Erase 03 19 of 25 ZJatt Problem for chocolate MÚEGYETEM 1 7 8 2 • Consider one such alloy that initially has a uniform carbon concentration of 0.25 wt% and is to be treated at 950C. If the concentration of carbon 0.025 at the surface is suddenly brought to 0.05 and maintained at 1.20 wt%, how long will it take to achieve a carbon content of 0.80 wt% at a position 0.5 mm below the surface? The diffusion coefficient for carbon in iron at this temperature is and 5.3 · 10-11 m²/s; assume that the steel piece is semi-infinite. erf(z) erf(z) erf(z) 0.55 0.5633 1.3 0.9340 0.0282 0.60 0.6039 1.4 0.9523 0.0564 0.65 0.6420 1.5 0.9661 0.10 0.1125 0.70 0.6778 1.6 0.9763 0.15 0.1680 0.75 0.7112 1.7 0.9838 0.20 0.2227 0.80 0.7421 1.8 0.9891 0.25 0.2763 0.85 0.7707 1.9 0.9928 0.30 0.3286 0.90 0.7970 2.0 0.9953 0.35 0.3794 0.95 0.8209 2.2 0.9981 0.40 0.4284 1.0 0.8427 2.4 0.9993 0.45 0.4755 1.1 0.8802 2.6 0.9998 0.50 0.5205 1.2 0.9103 2.8 0.9999 68°F ENG 9:33 PM gb Cloudy US 5/10/2022 +
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