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Engineering Materials

Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 57
RC 65
RC 80
RC 48

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Engineering Materials
1841 high speed steel contains

Vanadium 18%, chromium 1% and tungsten 4%
Vanadium 1%, chromium 4% and tungsten 18%
Vanadium 4%, chromium 18% and tungsten 1%
None of these

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Engineering Materials
Sulphur in cast iron

Makes the iron soft and easily machinable
Aids fusibility and fluidity
Make the iron white and hard
Increases hardness and brittleness

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Engineering Materials
Corrosion resistance of steel is increased by addition of

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

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

Flakes
Nodular aggregates of graphite
Free carbon
Cementite

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Engineering Materials
The following element can't impart high strength at elevated temperature

Manganese
Nickel
Magnesium
Silicon

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