A thick plate of 0.3 wt% C steel is to be carburized at 930 °C. The carburizing gas used holds the surface concentration at 1 wt% C. (a) Determine how long it will take for the C concentration to reach 0.6 wt% at a depth of 0.3 mm. (b) How long will it take to double the depth at which this concen- tration is reached? (Do not re-calculate the answer from scratch.) (c) By how much would the time in part (a) be changed if the tem- perature were raised by 50°C? (As before, do not re-calculate the answer from scratch.)
A thick plate of 0.3 wt% C steel is to be carburized at 930 °C. The carburizing gas used holds the surface concentration at 1 wt% C. (a) Determine how long it will take for the C concentration to reach 0.6 wt% at a depth of 0.3 mm. (b) How long will it take to double the depth at which this concen- tration is reached? (Do not re-calculate the answer from scratch.) (c) By how much would the time in part (a) be changed if the tem- perature were raised by 50°C? (As before, do not re-calculate the answer from scratch.)
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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Transcribed Image Text:A thick plate of 0.3 wt% C steel is to be carburized at 930 °C. The
carburizing gas used holds the surface concentration at 1 wt% C.
(a) Determine how long it will take for the C concentration to reach
0.6 wt% at a depth of 0.3 mm.
(b) How long will it take to double the depth at which this concen-
tration is reached? (Do not re-calculate the answer from scratch.)
(c) By how much would the time in part (a) be changed if the tem-
perature were raised by 50°C? (As before, do not re-calculate the
answer from scratch.)
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Step 1: Determine time taken(a)for concentration to reach 0.6wt%(b)to double the depth(c)if temp is raised.
VIEWStep 2: Calculate time taken for C concentration to reach 0.6wt% at depth of 0.3mm.
VIEWStep 3: Calculate time taken for C concentration when the depth is doubled.
VIEWStep 4: Calculate time difference between when the temperature is decreased to 50 degree Celsius and (a).
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