13162010
Descripción
Test por Stefan Serbic, actualizado hace más de 1 año
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Creado por Stefan Serbic
hace alrededor de 6 años
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Pregunta 1
Pregunta
The purpose of heat treatment of carbon steel is
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To soften the carbon steel prior to shaping and machining
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To relieve the residual stresses from strain hardening that occurs during cold forming
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To control dispersion strengthening for achieving the final strength and hardness required in the finished product
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All above
Pregunta 2
Pregunta
The microstructure in annealed carbon steel is
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Austenite
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Pearlite
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Bainite
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Martensite
Pregunta 3
Pregunta
Cooling down austenite by moderate cooling rate forms
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Cementite
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Pearlite
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Bainite
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Martensite
Pregunta 4
Pregunta
Carbon steel tempering should take place
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Prior to quenching
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After quenching
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Prior to normalizing
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After normalizing
Pregunta 5
Pregunta
Which of the following microstructures in carbon steel is a two-phased, lamellar (or
layered) structure composed of alternating layers of ferrite (88 wt. %) and cementite
(12 wt. %)?
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Bainite
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Austenite
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Martensite
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Pearlite
Pregunta 6
Pregunta
When austenite is cooled down at a very high rate by quenching, its FCC structure
will transform to Body Centred Tetragonal (BCT) known as
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Austenite
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Bainite
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Cementite
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Martensite
Pregunta 7
Pregunta
Which of the followings in carbon steel is an extremely hard and brittle phase which
lacks toughness so it should be tempered?
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Austenite
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Martensite
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Pearlite
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Ferrite
Pregunta 8
Pregunta
List the hardness in ascending order (from low to high) of micro-constitutes in plain
carbon steel
[blank_start]Ferrite[blank_end]-[blank_start]Pearlite[blank_end]-[blank_start]Bainite[blank_end]-[blank_start]Martensite[blank_end]
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Ferrite
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Pearlite
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Bainite
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Martensite
Pregunta 9
Pregunta
In the process of carbon steel normalizing, it is cooled down in
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furnace
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air
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water
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Saline water
Pregunta 10
Pregunta
In process of carbon steel quenching, which cooling medium has the bubbling
problem?
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Water
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Oil
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Salt water
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All above
Pregunta 11
Pregunta
What gas should be selected for quenching the carbon steel in the compressed gas
quenching process?
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O2
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Cl2
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H2
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N2
Pregunta 12
Pregunta
Surface hardening heat treatment is also called as
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Annealing
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Quenching
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tempering
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Case hardening
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