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Avinash Sinha
Copper
Asked: 2020-04-08T12:48:00+05:30 In:

Why same casting has different hardness and machine-ability properties?

Why same casting has different hardness and machine-ability properties?
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    2 Answers

    1. Gold Metallurgist, Standard Provider (IS, ASTM, BS, ISO etc), Laboratory Equipment Suppliers,

      Required more Initial information.. Cooling Rate..? Grades.? Factors maintained during casting?

      Required more Initial information..

      Cooling Rate..?

      Grades.?

      Factors maintained during casting?

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    2. Platinum⭐ GATE Metallurgy Coaching

      This is a very tricky and practical question. Thanks you asked this question. We know that some shapes which are somewhat not so regular is cast using molten liquid. We prepare a mold before casting process and if you are doing sand casting then mold will be sand. The mold has different cross sectioRead more

      This is a very tricky and practical question. Thanks you asked this question.

      We know that some shapes which are somewhat not so regular is cast using molten liquid. We prepare a mold before casting process and if you are doing sand casting then mold will be sand. The mold has different cross sectional areas at different locations and you know that whenever there is difference in thickness there will be difference of cooling rate.  This cooling rate difference causes different sizes of grains formation within a casting. The extent of chill zone is also different at different locations.

      One more important factor is the flowability of liquid metal inside the mold cavity. Different cross sectional areas produces different flowability and this causes different rate of heat extraction and results in different hardness values.

      These things affect on the mechanical properties and also influences the machinability.

      You must have heard that chillers are used in casting to increase the cooling rate at thicker cross sectional areas to maintain a kind of uniformity with thinner cross sectional areas.

       

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