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Engineering Materials

Engineering Materials
Foundry crucible is made of

German silver
Lead
Graphite
Mild steel

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Engineering Materials
Following elements have face-centered cubic structure

A iron (below 910°C and between 1400 to 1539°C), W
All of these
Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
Mg, Zn, Ti, Zr, Br, Cd

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Engineering Materials
Bronze contains

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

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Engineering Materials
Corrosion resistance of steel is increased by addition of

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

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Engineering Materials
Vanadium in high speed steels

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

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Engineering Materials
Pearlite consists of

13% cementite and 87% ferrite
13% carbon and 87% ferrite
13% ferrite and 87% cementite
6.67% carbon and 93.33% iron

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