Engineering Materials
For the allotropic forms of iron, the points of arrest are

Constant for all metals
The points where there is no further flow of metal
The points of discontinuity
The points where no further change occurs

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Engineering Materials
Tungsten in steel

Gives ductility, toughness, tensile strength and anti-corrosion properties
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Improves wear resistance, cutting ability and toughness
Improves cutting ability and reduces hardenability

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