Lecture 1

Question 1

What is one advantage and one disadvantage of casting?

Answer 1

Advantage: Product can have extremely complex shapes.
Disadvantage: Solidification leads to defects such as shrinkage and porosity.

Question 2

What is one advantage and one disadvantage of material removal?

Answer 2

Advantage: Outstanding dimensional precision.
Disadvantage: Produces scrap

Question 3

What is one advantage and one disadvantage of consolidation processes?

Answer 3

Advantage: Complex products can be assembled from simple shapes.
Disadvantage: Joint areas are affected by the joining process.

Question 4

What is one advantage and one disadvantage of additive manufacturing?

Answer 4

Advantage: Product parts on demand.
Disadvantage: Limited in time and range of material properties.

Question 5

What is one advantage and one disadvantage of deformation processes?

Answer 5

Advantage: High rates of production.
Disadvantage: Require powerful equipment and dedicated tools.

Question 6

Is the solid or liquid phase more stable?

Answer 6

Solid

Question 7

What is undercooling?

Answer 7

The temperature difference between the melting point and the actual temperature where nucleation starts.

Question 8

In given volume, more nuclei means XXX grain size.

Answer 8

Smaller

Question 9

Faster cooling gives XXX time for growth, XXX nucleation and XXX grains.

Answer 9

Less, more, finer

Question 10

What is innoculation?

Answer 10

Deliberate addition of small impurities (that do not melt) to provide sites for nucleation.

Question 11

Smaller grain size yields XXX mechanical properties.

Answer 11

Better