rk7-2 task 2

Question 1

which of the following is the correct heating temperature for a full anneal?

1. 10°C (50°F) above the upper critical temperature
2. 38°C (100°F) above the upper critical temperature
3. 10°C (50°F) below the solidification temperature
4. 38°C (100°F) below the solidification temperature

Answer 1

a. 10°C (50°F) above the upper critical temperature

Question 2

after part has been annealed it is cooled in

1. water
2. oil
3. air
4. a furnace

Answer 2

d. a furnace

Question 3

the purpose of full annealing is to refine the grain structure and to

1. preserve the austenite phase
2. restore ductility
3. induce carbide formation
4. remove graphite

Answer 3

b. restore ductility

Question 4

which of the following is the correct heating temperature for normalizing?

1. 10°C (50°F) above the upper critical temperature
2. 38°C (100°F) above the upper critical temperature
3. 10°C (50°F) below the solidification temperature
4. 38°C (100°F) below the solidification temperature

Answer 4

b. 38°C (100°F) above the upper critical temperature

Question 5

after part has been normalized it is cooled in

1. water
2. oil
3. air
4. a furnace

Answer 5

c. air

Question 6

both annealing and normalizing improve the ______ of steel

1. spherodizing
2. carbide precipitation
3. machinability
4. oxidation properties

Answer 6

c. machinability

Question 7

in comparison with annealing, normalizing produces a

1. more ductile steel
2. more austentic steel
3. steel higher in pearlite
4. harder steel

Answer 7

d. harder steel

Question 8

which of the following is the process used to remove residual stresses in wire and sheet?

1. tempering
2. spherodizing
3. process annealing
4. quenching

Answer 8

c. process annealing

Question 9

in which of the following processes do carbides form small globular-shaped balls?

1. tempering
2. shperodizing
3. process annealing
4. quenching

Answer 9

b. shperodizing

Question 10

what advantage does stress relief annealing have over a full annealing process?

1. less distortion
2. increased tensile strength
3. reduced arc blow
4. greater ductility

Answer 10

a. less distortion

Question 11

after a medium or high carbon steel has been hardened and quenched which type of microstructure is found?

1. austenitic
2. ferritic
3. martensitic
4. pearlite

Answer 11

c. martensitic

Question 12

in tempering steel after heating and quenching, what effect does the tempering temperature have on the steel?

1. the higher the tempering temperature, the softer and tougher the steel becomes
2. the higher the temperature, the more brittle the steel becomes
3. the higher the temperature, the more oxidation resistance the steel becomes
4. the higher the temperature, the more precipitation-hardened the steel becomes

Answer 12

a. the higher the tempering temperature, the softer and tougher the steel becomes

Question 13

after hardening the metal must cool completely before it is tempered.

1. true
2. false

Answer 13

b. false - tempering should be done immediately following quenching

Question 14

what effect does overheating during the hardening process have on a steel?

1. excessive austenite
2. excessive grain growth
3. hot shortness
4. carbide precipitation

Answer 14

b. excessive grain growth

Question 15

when drawing a steel to a specific colour, which process is the welder performing?

1. annealing
2. hardening
3. normalizing
4. tempering

Answer 15

d. tempering

Question 16

high-carbon steels require higher hardening temperatures than medium to low-carbon steels.

1. true
2. false

Answer 16

b. false - high carbon steel require lower hardening temperatures than low to medium carbon steals