Consider that the following materials are usable for manufacturing dies, moulds in the investment casting process for large-scale production:

1. Aluminium alloy

2. Magnesium alloy

3. Brass

4. Low-carbon steel

Which of the above are correctly usable?

This question was previously asked in
ESE Mechanical 2016 Paper 2: Official Paper
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  1. 1, 2 and 3 only
  2. 1, 2 and 4 only
  3. 3 and 4 only
  4. 1, 2, 3 and 4

Answer (Detailed Solution Below)

Option 1 : 1, 2 and 3 only
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Detailed Solution

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Concept:

  • The materials used for manufacturing dies, moulds in the investment casting process for large-scale production require high hardness.
  • Low-carbon steel does not have enough hardness.
  • Thus it cannot be used for the investment casting process as moulds.
  • Aluminium alloy, magnesium alloys, brass are used for manufacturing dies, moulds in investment casting as dies requires high hardness and also like high carbon steels due to high hardness.
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