ENGINEERING MATERIALS QUIZ

For the allotropic forms of iron, the points of arrest are

The points of discontinuity

The points where there is no further flow of metal

The points where no further change occurs

Constant for all metals

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Maximum percentage of carbon in ferrite is

0.001

0.00025

0.0025

0.0006

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Gamma iron exits at following temperature

Between 910°C and 1400°C

Room temperature

Between 1400°C and 1539°C

Near melting point

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The purpose of heat treatment is to

Modify the structure of the material

Any one of these

Relieve the stresses set up in the material after hot or cold working

Change grain size

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The property of a material essential for spring materials is

Plasticity

Ductility

Stiffness

Resilience

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In malleable iron, carbon is present in the form of

Flakes

Free carbon

Nodular aggregates of graphite

Cementite

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Iron is

Dielectric

Ferromagnetic

Paramagnetic

Ferroelectric

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The electric process of steel making is especially adapted to

High speed tool steel

All of these

Magnet steel

Alloy and carbon tool steel

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The unit cells

Have the same orientation and their similar faces are parallel

Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal

May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice

All of these

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Vanadium in high speed steels

Promotes retention of austenite

Promotes decarburisation

Forms very hard carbides and thus increases wear resistance

Provides high hot hardness

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