13162010
Descrição
Quiz por Stefan Serbic, atualizado more than 1 year ago
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Criado por Stefan Serbic
mais de 6 anos atrás
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|
Questão 1
Questão
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
Questão 2
Questão
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
Questão 3
Questão
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
Questão 4
Questão
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
Questão 5
Questão
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
Questão 6
Questão
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
Questão 7
Questão
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
Questão 8
Questão
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
Questão 9
Questão
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
Questão 10
Questão
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
Questão 11
Questão
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
Questão 12
Questão
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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