Test: Heat Treatment of Steels - 2


10 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering | Test: Heat Treatment of Steels - 2


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QUESTION: 1

Arrange the following in terms of increasing severity of quench
P. Oil quenching
Q. Water quenching
R. Water quenching with agitation
S. Brine quenching

Solution:
QUESTION: 2

Which one of the following does not improve fatigue life of a steel component?

Solution:
QUESTION: 3

As per the TTT diagram, bainite will form in eutectoid plain carbon steel when heated to 8500C followed by

Solution:
QUESTION: 4

Match the heat treatment processes of steels in Group-1 with the microstructural features in Group-2:
Group-1
P. Quenching
Q. Maraging
R. Tempering
S. Austerepering
Group-2
1. Bainite
2. Martensite
3. Intermetallic precipitates
4. Epsilon carbide

Solution:
QUESTION: 5

During carburising, carbon is introduced to form a layer of high carbon at the surface, The carbon is introduced in the form of

Solution:

Carburizing is the most widely method of surface hardening. The surface layers of a low carbon steel (C ≤ 0.2%) is enriched with carbon up to 0.8 - 1 %. The source of carbon may be a solid , liquid or gas medium. In all cases, the carbon enters the steel at the surface-and diffuse into the steel as a function of time at an elevated temperature.

QUESTION: 6

Maximum surface hardness is attained by

Solution:

Maximum surface hardness is produced by nitriding; next come cyaniding and carburising.

QUESTION: 7

Select the WRONG statement:

Solution:
QUESTION: 8

Select the wrong statement:

Solution:

In nitriding, only nitrogen is used.

QUESTION: 9

Killed steels

Solution:
QUESTION: 10

The following structure is obtained by Austempering process of heat treatment

Solution:

Bainite is produced by austempering process. In this process sample is heated and quenched to room temperature below the nose of T-T-T diagram and this temperature is maintained for a substantial period of time so that cooling curve enters into T-T-T diagram.

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