What do you think of the category of polymer for making a helmet?
2 answers:
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Answer:
a) The proeutectoid phase is known like cementite and its chemical formula is Fe₃C
b) The kilograms of total ferrite and is 0.8311 kg
The kilograms of total cementite is 0.1689 kg
c) The kilograms of total cementite is 0.9343 kg
Explanation:
Given:
1 kg of austenite
1.15 wt% C
Cooled to below 727°C
Questions:
a) What is the proeutectoid phase?
b) How many kilograms each of total ferrite and cementite form, Wf = ?, Wc = ?
c) How many kilograms each of pearlite and the proeutectoid phase form, Wp = ?
d) Schematically sketch and label the resulting microstructure
a) The proeutectoid phase is known like cementite and its chemical formula is Fe₃C
b) To get the mass of the total ferrite form:
Here,
Ccementite = composition of cementite = 6.7 wt%
C₁ = composition of phase 1 = 0.022 wt%
C₂ = composition of alloy = 1.15 wt%
Substituting values:
To get the mass of the total cementite:
c) The mass of pearlite:
d) In the diagram you can see the different compositions (pearlite, proeutectoid cementite, ferrite, eutectoid cementite)
Answer:
The solution to this question is 5.153×10⁻⁴(kmol)/(m²·s)
That is the rate of diffusion of ammonia through the layer is
5.153×10⁻⁴(kmol)/(m²·s)
Explanation:
The diffusion through a stagnant layer is given by
Where
= Diffusion coefficient or diffusivity
z = Thickness in layer of transfer
R = universal gas constant
= Pressure at first boundary
= Pressure at the destination boundary
T = System temperature
= System pressure
Where = 101.3 kPa
,
,
0.5×101.3 = 50.65 kPa
Δz = z₂ - z₁ = 1 mm = 1 × 10⁻³ m
R = T = 298 K and
= 1.18
= 1.8×10⁻⁵
= 5.153×10⁻⁴
Hence the rate of diffusion of ammonia through the layer is
5.153×10⁻⁴(kmol)/(m²·s)