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Engineering Materials

Engineering Materials
Hardness of martensite is about

RC 80
RC 48
RC 65
RC 57

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Engineering Materials
Addition of lead and bismuth to aluminium results in

Improving machinability
Improvement of corrosion resistance
Improvement of casting characteristics
One of the best known age and precipitation hardening systems

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

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Engineering Materials
Cemented carbide tools are not found to be suitable for cutting

Aluminium
Steel
Brass
Cast iron

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Engineering Materials
1841 high speed steel contains

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

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

Free carbon
Flakes
Cementite
Spheroids

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