Workshop Technology
During hot working of metals

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

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Workshop Technology
The purpose of a riser is to

Feed the molten metal to the casting in order to compensate for the shrinkage
Act as a reservoir for the molten metal
Deliver molten metal into the mould cavity
Deliver the molten metal from pouring basin to gate

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