CWB Level 3 Module 21 Practice Questions With
Correct Detailed Answers 2025 Newest Version
(100% Pass)
Save
Terms in this set (43)
The maximum solubility (c) 0.02%.
of carbon in a iron is:
(a) 2%.
(b) 0.002%.
(c) 0.02%.
(d) There is no solubility.
True or false? True
When a steel is heated
into the austenite region,
all carbon and most
other compounds
dissolve
to form a single phase.
True or false? False
Pearlite is a single phase.
What is the resulting About 25% proeutectoid ferrite and 75% pearlite
structure of a 0.6%
carbon steel slowly
cooled from 900°C to
room
temperature?
, Most fine grain steels (b)
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.
Why is martensite Insufficient time for carbon to diffuse to form
produced rather than carbides
pearlite when a
steel is rapidly quenched
from, 900°C?
The hardness of (c)
martensite depends
mainly on the:
(a) alloy content.
(b) rate of cooling.
(c) carbon content.
(d) size of the part.
Can bainite normally be No
produced in continuous
cooling of a plain carbon
steel?
Increasing the carbon (a) lowers the martensite start temperature M.
content:
(a) lowers the martensite
start temperature M.
(b) raises the M.
(c) has no effect on M.
Correct Detailed Answers 2025 Newest Version
(100% Pass)
Save
Terms in this set (43)
The maximum solubility (c) 0.02%.
of carbon in a iron is:
(a) 2%.
(b) 0.002%.
(c) 0.02%.
(d) There is no solubility.
True or false? True
When a steel is heated
into the austenite region,
all carbon and most
other compounds
dissolve
to form a single phase.
True or false? False
Pearlite is a single phase.
What is the resulting About 25% proeutectoid ferrite and 75% pearlite
structure of a 0.6%
carbon steel slowly
cooled from 900°C to
room
temperature?
, Most fine grain steels (b)
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.
Why is martensite Insufficient time for carbon to diffuse to form
produced rather than carbides
pearlite when a
steel is rapidly quenched
from, 900°C?
The hardness of (c)
martensite depends
mainly on the:
(a) alloy content.
(b) rate of cooling.
(c) carbon content.
(d) size of the part.
Can bainite normally be No
produced in continuous
cooling of a plain carbon
steel?
Increasing the carbon (a) lowers the martensite start temperature M.
content:
(a) lowers the martensite
start temperature M.
(b) raises the M.
(c) has no effect on M.
