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WorksheetsQuiz 1 Material Science
Total questions: 41
Worksheet time: 21mins
Iron carbon phase diagram
tertiary system
binary system of iron and carbon
only iron composition
only carbon composition
Ferrite with maximum solubility at temperature at what degree of celcius
727
831
1539
1987
austenite has maximum solubility in what percent of carbon
2.14
4.15
6.27
3.65
the characteristic of cementite is
elastic
hard and brittle
plastic
ductility
TWO PHASES OF FERRITE AND CEMENTITE CALLED …...
cementite
pearlite
ferrite
austenite
Diffusion is the natural movement of molecules from:
Areas of low concentration to areas of high concentration
Areas of high concentration to areas of low concentration
Cold to hot environments
Gaseous to liquid environments
What is the eutectoid structure of Iron?
Cementite
Ferrite
Pearlite
Austentite
Which of the following alloying element forces the carbon out of the solution?
Silicon
Sulphur
Nickel
Titanium
Which of the following alloying element forces the carbon out of the solution?
Silicon
Sulphur
Nickel
Titanium
Which of the following element is added to steel to form stainless steel?
Copper
Boron
Chromium
Titanium
TTT diagram means
Time Temperature Transformation
Time Time Transformation
Temperature Temperature Transformation
None of the above
In tempering of martensite, Steel is heated to a temperature range of ------ to ----------- in the furnace
250°C to 650°C
300°C to 600°C
250°C to 600°C
300°C to 650°C
why steel gear must undergo heat treatment process
to increase price
to increase ductility
to increase plasticity
to increase hardness of teeth
Define heat treatment process
controlled heating of metals to alter their mechanical properties without changing the product’s shape
controlled heating and cooling of metals to alter their mechanical properties without changing the product’s shape
controlled cooling of metals to alter their mechanical properties without changing the product’s shape
"controlled heating and cooling of metals to alter their mechanical properties and changing the product’s shape"
during heat treatment process, the steel must be heated to its_____________temperature
recrystallization
melting
boiling
vapour
below is the purpose of heat treatment, except :
to increase machinability
to increase hardness
refine grain size
to increase the internal stress
annealing means the steel that undergo heating will be cooled _______
rapidly
slowly
normally
quenching process will produce _______ steel
harder
softer
shiner
stronger
if an engineer want to soften the steel rod to be machined, the rod can put into _______ process
annealing
quenching
normalizing
tempering
how to decrease softness of steel
by doing annealing
by doing quenching
by doing normalizing
by doing stress relieving annealing
In a 1080 steel, which heat treatment results in a microstructure of Fine Pearlite?
Annealing
Normalizing
Quenching
Tempering
The heat treatment after quenching which relieves internal stresses is known as:
Annealing
Tempering
De-stressing
Normalizing
Which element
-increase hardenability, lowers hardening temp
-promotes an austenitic structure
-combines with sulfur to reduce its adverse effect
Molybdenum
Chromium
Vanadium
Manganese
Which element removes
-oxygen in steelmaking
-improves toughness
-increases hardenability
Molybdenum
Silicon
Aluminium
Nickel
Sulphur and Phosphorous, Lead → Adds Machinability
True
False
What is the carbon content of cast iron?
0.15%
0.15% - 0.25%
0.50% - 1.50%
3% - 4%
With the increase in carbon content of steel, ductility will
increase
decrease
remain same
Which of the following groups of alloying elements stabilize austenite?
Ni, Mn, Cu, and Co
Cr, W, Mo, V, and Si
Cr, W, Ti, Mo, Nb, V, and Mn
Co, Al, and Ni
_______________________ can be defined as a heat-treating process which creates a thin wear resistant layer on the outer surface of a material while permitting the inner core of the material to remain soft and ductile
Surface hardening
Surface quenching
Hardenability
I - After carburising, a secondary heat-treating step is employed to cause the hardening action.
II - Heating material to austenization temperature
III - Bringing a carbon-rich material into contact with the steel.
IV - This forms a carbon-rich layer or case which is capable of being heat treated to a very hard condition. (Fe3C2 )
V- The carbon atoms are enticed to move from the carbon rich material into the outer surface of the steel parts.
VI - It should be emphasized that the addition of carbon to the surface does not cause hardening directly.
III - II - V - IV - VI - I
III - II - V - VI - IV - I
III - II - VI - V - IV - I
Which of the following property is affected by heat treatment?
Hardness
Strength
Ductility
All of the mentioned
Flame hardening involves
Heating the surface above the transformation range
Quenching after heating
Minimum case depth is 1mm
All of the mentioned
Induction hardening process involves
Heating surface by induction in field of invariable current
Case depth minimum of 2mm are produced
Heating surface by induction in field of alternating current
None of the mentioned
Austempering improves ______
corrosion resistance
toughness
hardness
tensile strength
In conventional hardening _______ transforms to _______
austenite, martensite
cementite, martensite
pearlite, α-iron
austenite, ferrite
How much iron does cementite contain?
6.67%
24.23%
73.4%
93.3%
7.What is meant by invariant point ?
Degree of freedom is zero
Number of component is zero
Number of phases is zero
Non of the above
In Gibbs phase rule (2+C=F+P), 2 in the equation implies which of the following two can be changed independently
Pressure and Composition
Pressure and Temperature
Temperature and Composition
None
Solvus is a line on the phase diagram which differentiates between
a liquid and a solid
different liquids
different solids
None
Name the reaction marked in red on the figure
Eutectoid
Peritectoid
Peritectic
Eutectic
