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Pressure change of a melt is responsible for the cooling rate of the castings in the mould.

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in Casting-Forming-Welding I by (687k points)
Pressure change of a melt is responsible for the cooling rate of the castings in the mould.

(a) True

(b) False

I had been asked this question in an online quiz.

The question is from Casting Cleaning topic in division Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

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Right answer is (b) False

For explanation: Pressure has no effects on cooling rate of castings; the cooling rate depends upon the casting thickness, the total mass as well as the type of mould. More the mass or density of the castings will show less cooling rate and more the surface area of castings will have fast cooling rate of the castings in the mould.

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