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CWB LEVEL 3 MODULE 21 EXAM 2024/2025
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CWB LEVEL 3 MODULE 21 EXAM 2024/2025
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CWB LEVEL 3 MODULE 21 EXAM2024/2025
The maximum solubility of carbon in a iron is:
(a) 2%.
(b) 0.002%.
(c) 0.02%.
(d) There is no solubility. - Precise Answer ✔✔(c) 0.02%.
True or false?
When a steel is heated into the austenite region, all carbon and most
other compounds dissolve
to form a single phase. - Precise Answer ✔✔True
True or false?
Pearlite is a single phase. - Precise Answer ✔✔False
What is the resulting structure of a 0.6% carbon steel slowly cooled from
900°C to room
temperature? - Precise Answer ✔✔About 25% proeutectoid ferrite and
75% pearlite
Most fine grain steels retain their fine grains: (
, (a) up to the melting temperature.
(b) up to the grain coarsening temperature, but above that behave as
coarse grain steel. C
(c) only up to the transformation temperature. - Precise Answer ✔✔(b)
Why is martensite produced rather than pearlite when a
steel is rapidly quenched from, 900°C? - Precise Answer ✔✔Insufficient
time for carbon to diffuse to form carbides
The hardness of martensite depends mainly on the:
(a) alloy content.
(b) rate of cooling.
(c) carbon content.
(d) size of the part. - Precise Answer ✔✔(c)
Can bainite normally be produced in continuous cooling of a plain
carbon steel? - Precise Answer ✔✔No
Increasing the carbon content:
(a) lowers the martensite start temperature M.
(b) raises the M.
(c) has no effect on M. - Precise Answer ✔✔(a) lowers the martensite
start temperature M.
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