Deck 2: Heat Treatment Processes and Transformation Products of Austenite

Question 1

In case of normalising heat treatment process hypereutectoid steels are heated above --------- temperature

A)ac1
B)ac3
C)acm
D)none of the above

Answer 1

acm

Question 2

One of the following is a transformation product of austenite.

A)austenite to ferrite
B)austenite to ledeburite
C)austenite to pearlite
D)none of the above

Answer 2

austenite to pearlite

Question 3

One of the following is a transformation product of austenite.

A)austenite to ferrite
B)austenite to ledeburite
C)austenite to martensite
D)none of the above

Answer 3

austenite to martensite

Question 4

One of the following is a transformation product of austenite.

A)austenite to ferrite
B)austenite to ledeburite
C)austenite to carbide
D)none of the above

Question 5

The Chemical formula for cementite is

A)fe3c
B)fec3
C)fe2c3
D)none of the above

Question 6

Following is one of the heat treatment process.

A)melting
B)solidification
C)hardening
D)none of the above

Question 7

One of the following is a heat treatment process for metals

A)annealing
B)normalising
C)hardening
D)all of the above

Question 8

From the following process,one is not a heat treatment process

A)annealing
B)normalising
C)hardening
D)machining

Question 9

One of the following is a transformation product of austenite.

A)austenite to pearlite
B)austenite to bainite
C)austenite to martensite
D)all of the above

Question 10

Pearlite is madeup of alternate colonies or lamilies of ---------and -------

A)ferrite and martensite
B)ferrite and pearlite
C)ferrite and cementite
D)none of the above

Question 11

transformation of austenite to bainite starts from nucleation of-------at austenitic grain boundary

A)ferrite
B)cementite
C)pearlite
D)none of the above

Question 12

Bainite phase is divided into two types-------and--------

A)upper bainite and lower bainite
B)large bainite and small bainite
C)fast bainite and slow bainite
D)none of the above

Question 13

Martensite phase is obtain by

A)fast cooling or quenching
B)slow cooling
C)no cooling
D)none of the above

Question 14

The isothermal transformation diagram i.e. TTT diagrams are --------

A)total transformation time
B)total temperature transformation
C)time temperature transformation
D)none of the above

Question 15

In the heat treatment cycle CCT means-------

A)coolest cooling rate
B)compared cooling rate
C)critical cooling rate
D)none of the above

Question 16

Heat treatment can be defined as

A)heating the metal in a solid state and then cooling it in a different manner
B)heating the metal to melting point nad then cool to room temperature
C)both a and b
D)none of the above

Question 17

One of the main purpose of heat treatment

A)to improve ductility and strength
B)to relieve internal stresses
C)to improve machinability
D)all of the above

Question 18

one of the following is heat treatment process for metal

A)casting
B)forging
C)rolling
D)none of the above

Question 19

one of the following is a purpose of anneling

A)to soften the metal
B)to relieve internal stresses
C)to improve machinability
D)all of the above

Question 20

In anneling process the metal from high temp is cooled very slowly in the furnace. This statement is -----

Question 21

one of the following cooling rate used for normalizing process

A)furnace cooling
B)water coolong
C)air cooling
D)none of the above

Question 22

Which heat treatment process is carried out after hardening process

A)annealing
B)normalising
C)tempering
D)none of the above

Question 23

one of the following is main purpose of Normalizing

A)to improve machinability
B)to modify and refine grain
C)to homogenize the microstructure
D)all of the above

Question 24

CCR is a minimum cooling rate of steel, by which we get 100% ------phase

A)bainite
B)pearlite
C)austenite
D)martensite

Question 25

One of the following is type of tempering heat treatment

A)low temperature tempering
B)high temperature tempering
C)medium temperature tempering
D)all of the above