Workshop Technology
The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as

Extrusion
Cold heading
Hot piercing
Cold peening

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Workshop Technology
During hot working of metals

Mechanical properties are improved due to refinement of grains
All of the listed here
Grain structure of the metal is refined
Porosity of the metal is largely eliminated

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Workshop Technology
In a hot chamber die casting machine

Ferrous alloys with low melting temperature are casted
Nonferrous alloys with low melting temperature are casted
Nonferrous alloys with high melting temperature are casted
Ferrous alloys with high melting temperature are casted

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