Question 1

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

Accepted Answer

In the case of hypereutectoid steels, the normalizing heat treatment process involves heating the steel above the Acm temperature. This is because the Acm line represents the temperature above which the austenite phase is stable in hypereutectoid steels, allowing for the dissolution of cementite and the formation of a homogeneous austenite phase before cooling.

Question 2

One of the following is a transformation product of austenite.

Accepted Answer

Austenite can transform into pearlite under certain cooling conditions, which involves a eutectoid reaction where austenite transforms into a mixture of ferrite and cementite.

Question 3

One of the following is a transformation product of austenite.

Accepted Answer

Austenite can transform into martensite under rapid cooling or quenching conditions, which is a diffusionless transformation resulting in a hard and brittle phase.

Question 4

One of the following is a transformation product of austenite.

Accepted Answer

The answer of One of the following is a transformation...

Question 5

The Chemical formula for cementite is

Accepted Answer

Cementite has the chemical formula Fe3C, where iron (Fe) combines with carbon (C) in a 3:1 ratio.

Question 6

Following is one of the heat treatment process.

Accepted Answer

Hardening is a heat treatment process used to increase the hardness of a material. It typically involves heating the material to a specific temperature, followed by rapid cooling or quenching, which increases the hardness and strength of the material.

Question 7

One of the following is a heat treatment process for metals

Accepted Answer

Annealing, normalising, and hardening are all heat treatment processes used to alter the physical and sometimes chemical properties of a metal. Annealing involves heating a material to a specific temperature and then cooling it at a controlled rate to reduce hardness and improve ductility. Normalising is a heat treatment process that brings the metal back to its normal state by making its grain size uniform. Hardening increases the hardness of the metal by heating it to a high temperature and then rapidly cooling it.

Question 8

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

Accepted Answer

Machining is a metalworking process that involves the removal of material from a workpiece using a cutting tool. It is not a heat treatment process.

Question 9

One of the following is a transformation product of austenite.

Accepted Answer

All of the options listed (austenite to pearlite, austenite to bainite, and austenite to martensite) are transformation products of austenite. These transformations occur under different cooling rates and conditions in the steel heat treatment process.

Question 10

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

Accepted Answer

Pearlite is a two-phased, lamellar (or layered) structure composed of alternating layers of ferrite and cementite (Fe3C) that occurs in some steels and cast irons during slow cooling from high temperatures.

Question 11

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

Accepted Answer

The transformation of austenite to bainite starts with the nucleation of ferrite at the austenitic grain boundaries. This is the initial phase that forms during the bainitic transformation process.

Question 12

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

Accepted Answer

Bainite is a phase in steel that forms at certain temperatures and cooling rates, and it is divided into upper bainite and lower bainite. These two types differ in their morphology and the temperature range in which they form. Upper bainite forms at higher temperatures than lower bainite.

Question 13

Martensite phase is obtain by

Accepted Answer

Martensite phase in steel is obtained by fast cooling or quenching from the austenitizing temperature. This rapid cooling transforms the austenite into martensite, a hard and brittle phase.

Question 14

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

Accepted Answer

TTT diagrams stand for Time Temperature Transformation, which are used to describe the kinetics of phase transformations in materials at constant temperature.

Question 15

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

Accepted Answer

CCT stands for Continuous Cooling Transformation, and the critical cooling rate is the minimum cooling rate required to achieve a desired microstructure in a steel alloy.

Question 16

Heat treatment can be defined as

Accepted Answer

Heat treatment involves heating the metal in its solid state and then cooling it in a controlled manner to alter its physical and mechanical properties without changing its shape.

Question 17

One of the main purpose of heat treatment

Accepted Answer

Heat treatment processes are used to alter the physical and sometimes chemical properties of a material. This includes improving ductility and strength, relieving internal stresses, and enhancing machinability among other benefits.

Question 18

one of the following is heat treatment process for metal

Accepted Answer

Heat treatment processes involve the heating and cooling of metals in a controlled manner to alter their physical and mechanical properties without changing the product shape. Casting, forging, and rolling are metal forming processes, not heat treatment processes.

Question 19

one of the following is a purpose of anneling

Accepted Answer

Annealing is a heat treatment process used for various purposes, including softening the metal, relieving internal stresses, and improving machinability.

Question 20

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

Accepted Answer

Annealing involves heating a metal to a specific temperature and then cooling it very slowly, typically inside a furnace, to relieve internal stresses and improve its ductility and toughness.

Quiz 2: Heat Treatment Processes and Transformation Products of Austenite

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

One of the following is a transformation product of austenite.

One of the following is a transformation product of austenite.

One of the following is a transformation product of austenite.

The Chemical formula for cementite is

Following is one of the heat treatment process.

One of the following is a heat treatment process for metals

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

One of the following is a transformation product of austenite.

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

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

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

Martensite phase is obtain by

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

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

Heat treatment can be defined as

One of the main purpose of heat treatment

one of the following is heat treatment process for metal

one of the following is a purpose of anneling

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