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Engineering Materials

Engineering Materials
Nickel when added to copper improves

Hardness and strength
Machinability
Hardness
Strength and ductility

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

RC 48
RC 57
RC 65
RC 80

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

Flakes
Cementite
Free carbon
Spheroids

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Engineering Materials
Drop forging dies contain carbon of the order of

0.25 to 0.5%
0.6 to 0.7%
0.7 to 0.9%
0.1 to 0.2%

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Engineering Materials
Body centered cubic space lattice is found in

Gamma iron, aluminium, copper, lead, silver and nickel
Alpha iron, tungsten, chromium and molybdenum
Zinc, magnesium, cobalt, cadmium, antimony and bismuth
None of these

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Engineering Materials
Bronze contains

70 - 75% copper and rest tin
85 - 92% copper and rest tin with little lead and nickel
90% copper and 10% tin
70% copper and 30% zinc

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