rk7-3 task 3

Question 1

Identify the four main types of heat treatments used with aluminum and its alloys.

Answer 1

• annealing
• solution heat treatments
• percipitation-hardening
• stress-relieving

Question 2

at what temperature does solution heat treatment occur?

1. 510°C (950°F)
2. 555°C (1030°F)
3. 610°C (1130°F)
4. 665°C (1230°F)

Answer 2

a. 510°C (950°F)

Question 3

what is the main difference between annealing pure aluminum and aluminum wrought alloys?

1. heat time
2. cooling rate
3. quenching rate
4. maximum temperature

Answer 3

b. cooling rate

Question 4

precipitation hardening takes place after

1. solution heat treating
2. annealing
3. stress-relieving
4. hot forging

Answer 4

a. solution heat treating

Question 5

which heat treatment improves corrosion resistance?

1. stress-relieving
2. annealing
3. solution heat treatment
4. precipitation-hardening

Answer 5

c. solution heat treatment

Question 6

which heat treatment restores ductility?

1. stress-relieving
2. annealing
3. solution heat treatment
4. precipitation-hardening

Answer 6

b. annealing

Question 7

which heat treatment increases tensile strength and hardness?

1. stress-relieving
2. annealing
3. solution heat treatment
4. precipitation-hardening

Answer 7

d. precipitation-hardening