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Engineering Materials

Engineering Materials
Chromium when added to steel _________ the tensile strength.

None of these
Does not effect
Decreases
Increases

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Engineering Materials
Delta iron occurs at temperature of

Above melting point
Between 1400°C and 1539°C
Between 910°C and 1400°C
Room temperature

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Engineering Materials
Which is false statement about case hardening? Case hardening is done by

Nitriding
Cyaniding
Induction hardening
Electroplating

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Engineering Materials
Corrosion resistance of steel is increased by addition of

Tungsten, molybdenum, vanadium, chromium
Vanadium, aluminium
Sulphur, phosphorus, lead
Chromium and nickel

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Engineering Materials
Vanadium in high speed steels

Forms very hard carbides and thus increases wear resistance
Promotes decarburisation
Provides high hot hardness
Promotes retention of austenite

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Engineering Materials
In malleable iron, carbon is present in the form of

Flakes
Nodular aggregates of graphite
Cementite
Free carbon

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