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A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as

Engineering Materials, Mechanical Engineering /
Question: A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as
[A].

normalising

[B].

annealing

[C].

austempering

[D].

martempering

Answer: Option C

Explanation:

No answer description available for this question.

A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as Read More »

Engineering Materials, Mechanical Engineering

In a hardening process, the hypo-eutectoid steel is

Engineering Materials, Mechanical Engineering /
Question: In a hardening process, the hypo-eutectoid steel is
[A].

heated from 30° C to 50° C above the upper critical temperature and then cooled in still air

[B].

heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

[C].

heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace

[D].

heated below or close to the lower critical temperature and then cooled slowly

Answer: Option B

Explanation:

No answer description available for this question.

In a hardening process, the hypo-eutectoid steel is Read More »

Engineering Materials, Mechanical Engineering

In spheroidising process, the steel is

Engineering Materials, Mechanical Engineering /
Question: In spheroidising process, the steel is
[A].

heated below the lower critical temperature and then cooled slowly

[B].

heated upto the lower critical temperature and then cooled in still air

[C].

heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

[D].

none of the above

Answer: Option C

Explanation:

No answer description available for this question.

In spheroidising process, the steel is Read More »

Engineering Materials, Mechanical Engineering

In process annealing, the hypo-eutectoid steel is

Engineering Materials, Mechanical Engineering /
Question: In process annealing, the hypo-eutectoid steel is
[A].

heated from 30° C to 50° C above the upper critical temperature and then cooled in still air

[B].

heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

[C].

heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace

[D].

heated below or close to the lower critical temperature and then cooled slowly

Answer: Option D

Explanation:

No answer description available for this question.

In process annealing, the hypo-eutectoid steel is Read More »

Engineering Materials, Mechanical Engineering