ASTM grain Q.4( A sheet of BCC iron (Fe purity is 99.988 wt% ) 1 mm thick was exposed to a carburizing gas atmosphere on one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces of the sheet were determined to be 0.015 and 0.0065 wt%.

ASTM grain Q.4( A sheet of BCC iron (Fe purity is 99.988 wt% ) 1 mm thick was exposed to a carburizing gas atmosphere on one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces of the sheet were determined to be 0.015 and 0.0065 wt%.

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

Q 4 please

Q.2(
Calculate the equilibrium number of vacancies per cubic meter for copper at 160 and 927 C. The energy for
vacancy formation is 0.9 eV/atom; the atomic weight and density for copper are 63.5 g/mol and 8.4 g/cm³,
respectively.
Q.3 (
Suppose we count 18 grains per square inch in a photomicrograph taken at magnification 300x. What is the
ASTM grain size number (n)?
Q.4(
A sheet of BCC iron (Fe purity is 99.988 wt% ) 1 mm thick was exposed to a carburizing gas atmosphere on
one side and a decarburizing atmosphere on the other side at 725°C. After having reached steady state, the
iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces of the sheet
were determined to be 0.015 and 0.0065 wt%.

Compute the diffusion coefficient if the diffusion flux is 1.5 X 10-8 kg/m². s, density for copper and iron are
2.26 g/cm³ and 7.87 g/cm³ respectively. (Note: convert the concentrations from weight percent to kilograms
of carbon per cubic meter of iron)
Q.5
L₁.
J

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