Title: Summary Part Metal Processing

Choose the correct statement.

- Casting is a method where a liquid (such as molten metal) is poured into an open cavity and solidifies to take that form. (correct)
- Casting is a manufacturing method where a material is deformed by force to take the desired shape.
- Casting is a method where powders are shaped into the desired structure and heated to form a solid part

- In casting, the material will cool form the surface inwards as the mold is the cold surface and heat will transfer out through the mold interface. Thus, thin sections of a cast part will solidify more quickly than thick sections. (correct)
- In casting, all parts of the component will solidify at the exact same time.
- In casting, the material solidifies from the surface inward but all parts will solidify at the same rate regardless of the size of the cavity occupied by the cooling metal.

- Forming is a manufacturing method where materials are plastically deformed under heat and pressure to make specific shapes. The final shape may require several rounds of deformation in order to be formed. (correct)
- Forming is a manufacturing method where materials are plastically deformed under heat and pressure to make specific shapes. All shapes feasible through forming can be produced with one pass of deformation.
- Forming is a manufacturing method where materials are elastically deformed under heat and pressure to make specific shapes. The microstructure is uneffected in forming.

- Powder processes are uniquely well suited for materials which cannot be easily melted or deformed. (correct)
- Powder processes are uniquely well suited for materials with low melting temperatures.
- Powder processes are the best method for manufacutring with minimal application of pressure on the part.

- Solidification of pure metals takes place at a constant temperature (there is an arrest point in temperature), whereas solidification of alloys occurs over a range of temperatures. (correct)
- Solidification of pure metals and alloys takes place at a constant temperature (there is an arrest point in temperature).
- Solidification of pure metals and alloys takes place over a range of decreasing temperature (there is no arrest point in temperature), with the driving force for nucleation increasing with decreasing temperature.

- The composition and cooling rates of the molten metal both affect the size and shape of the grains and the dedrites in the solidifying alloy; in turn, these influence properties of the cast part. (correct)
- The composition of the molten metal mainly affects the size and shape of the grains and the dedrites in the solidifying alloy; in turn, these influence properties of the cast part. In contrast, the cooling rate mainly affects the production rate and hence the economic parameters of the process.

- Because most metals contract during solidification and cooling, various defects can arise in cast parts, for example cavities and cracks. Additionally, porosity can be caused by gases evolved during solidification (their solubility in the melt is higher than in the solid metal). (correct)
- Because most metals contract during solidification and cooling, various defects can arise in cast parts, for example cavities, cracks and porosity.
- Because most metals expand during solidification and cooling, various defects can arise in cast parts, for example cavities and cracks. Additionally, porosity can be caused by gases evolved during solidification (their solubility in the melt is higher than in the solid metal).

- All methods of manufacturing discussed (casting, forming, and powder processing) have inherent impact on the microstructure which sometime is beneficial and other times leads to flaws or undesirably properties if not properly controlled. (correct)
- Only through casting can we modify microstructure, forming and powder processes do not have any impact on the observed microstructure of the final part.
- Only powder processing is susceptable to pores/porosity.

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