1. What are the age hardening alloy systems in Al-based alloys
based on classification of major alloyingsystems for Al-based
alloys?
2.In alloy system of Al - 4.4%Cu - 0.8%Si - 0.8%Mn - 0.5%Mg
which is commonly used for aircraft structures, sketch and explain
all transformation stages during age hardening. What is the driving
mechanism for each step?
(a) What is the distinction between
hypoeutectoid and hypereutectoid steels?
(b) In a hypoeutectoid steel, both eutectoid
and proeutectoid ferrite exist. Explain the difference between
them. What will be the carbon concentration in each?
(c) In bullet format compare and contrast the
expected mechanical behavior of hypoeutectoid and hypereutectoid
steels in terms of: (i) Yield strength (ii) Ductility (iii)
Hardness (iv) Tensile strength
a)(10%) What is the distinction between hypoeutectoid and
hypereutectoid steels? b)(10%) For a 99.65 wt% Fe – 0.35 wt% C
alloy at a temperature just below the eutectoid, determine the
following: i.The fractions of total ferrite and cementite phases.
ii.The fractions of the proeutectoid ferrite and pearlite. Sketch
the microstructure. iii.The fraction of eutectoid ferrite.
a)(10%) What is the distinction between hypoeutectoid and
hypereutectoid steels? b)(10%) For a 99.65 wt% Fe – 0.35 wt% C
alloy at a temperature just below the eutectoid, determine the
following: i.The fractions of total ferrite and cementite phases.
ii.The fractions of the proeutectoid ferrite and pearlite. Sketch
the microstructure. iii.The fraction of eutectoid ferrite.
1. Write an introduction about the thermal and
mechanical properties of stainless steel and how it is suited to
the construction industry
2. Write an introduction about the fire testing in
stainless steel
3. identify problems situated to stainless steel e.g.
cost etc
4. Write up a scope based on this topic
Using the principles of supply and demand as applied to labor
markets, what are the effects of placing a universal binding
minimum wage on a labor market that is otherwise perfectly
competitive? What are the effects if the minimum wage is not
universal (i.e., if there is a sector of the labor market not
covered by the minimum wage – such as waiters and waitresses)? In
both cases briefly discuss potential efficiency effects.
a) What are the disadvantages of using single coil springs for
mechanical seals? b) What are the main advantages associated with
the use of multi-coil springs?