True / False 1. The primary difference, in terms of processing, between gray iro

Question

True / False
1. The primary difference, in terms of processing, between gray iron and ductile iron is that ductile iron has a very small addition of Mg or Ce added to generate nodules of graphite in the microstructure.
2. Ferrous based materials are sometimes limited in their use in a given application due to issues such as poor corrosion resistance, high density, and relatively poor conductivity.
3. Annealing is the exposure of a material to an elevated temperature for a short time period followed by quenching to room temperature at a fast rate.
4. Die casting is generally more capital intensive than sand casting and so is better suited for making high volumes of the same part.
5. Over-aging during precipitation hardening processing will result in a decrease in strength of the material.

Explanation / Answer

True

1. The primary difference, in terms of processing, between gray iron and ductile iron is that ductile iron has a very small addition of Mg or Ce added to generate nodules of graphite in the microstructure

True

2. Ferrous based materials are sometimes limited in their use in a given application due to issues such as poor corrosion resistance, high density, and relatively poor conductivity

Flase

3. Annealing is the exposure of a material to an elevated temperature for a short time period followed by quenching to room temperature at a fast rate.

True

4. Die casting is generally more capital intensive than sand casting and so is better suited for making high volumes of the same part.

True

4. Die casting is generally more capital intensive than sand casting and so is better suited for making high volumes of the same part.

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