This set of Heat Treatment of Metals and Alloys Multiple Choice Questions & Answers (MCQs) focuses on “Steels Processes – Partial Annealing”.
1. Which one of the following statements is correct regarding partial annealing?
a) Hypoeutectoid steel is treated with this
b) Hypereutectoid steel is treated with this
c) Eutectoid steel is treated with this
d) Hypoeutectoid steel and eutectoid steel is treated with this
View Answer
Explanation: Unlike full annealing and isothermal annealing, which are applicable only for hypoeutectoid steel and eutectoid steel. Partial annealing is used mostly for hypereutectoid steels.
2. Which one of the following statements is correct regarding temperature range in partial annealing?
a) Above upper critical temperature
b) Below lower critical temperature
c) Between upper and lower critical temperature
d) Can be anywhere
View Answer
Explanation: In case of partial annealing, steel is heated to a temperature between upper and lower critical temperature. For full annealing, steel is heated to a temperature above upper critical temperature. For stress relieving, steel is heated to a temperature below lower critical temperature.
3. Partial annealing is also known as _________ annealing.
a) intercritical
b) subcritical
c) hmogenizing
d) process
View Answer
Explanation: Partial annealing is also known as intercritical annealing. It is employed to improve mechanical properties. Grain refinement takes place in this case.
4. What is the final product of partial annealing?
a) Fine pearlite and cementite
b) Coarse pearlite
c) Fine austenite
d) Fine ledeburite
View Answer
Explanation: In case of partial annealing, the final product is fine pearlite and cementite. In case of full annealing, the final product is coarse pearlite. This is the basic difference between full annealing and partial annealing.
5. Partial annealing is more expensive than full annealing.
a) True
b) False
View Answer
Explanation: Partial annealing is more expensive than full annealing. This statement is false. Lower temperatures are required for partial annealing than full annealing, therefore partial annealing is cheaper.
6. All types of hypoeutectoid steels can heat treated by partial annealing.
a) True
b) False
View Answer
Explanation: Some hypoeutectoid steel can be heat treated with partial annealing but not all of them. Hypoeutectoid steels with coarse grained structure are not given this treatment.
Sanfoundry Global Education & Learning Series – Heat Treatment of Metals and Alloys.
To practice all areas of Heat Treatment of Metals and Alloys, here is complete set of Multiple Choice Questions and Answers.
