Essay Answer Type Questions

ESSAY ANSWER TYPE QUESTIONS

On Introduction to Heat Treatment

1. (a) What is meant by heat treatment?

(b) Why is it an important manufacturing process?

(c) Explain the various stages of heat treatment procedure.

On Various Heat Treatment Processes

2. Compare and contrast the process of full annealing, process annealing, stress relief annealing, recrystallisation annealing, and spheroidise annealing.

3. (a) Describe the normalising process of heat treatment. 

(b) Differentiate between normalising and full annealing.

4. (a) What do you understand by hardening of steel? 

(b) Discuss the reason why martensite is very hard.

(c) Also discuss the various characteristics of martensite transformation. 

5. (a) Explain briefly the theory of tempering of alloy steels in the Holzhitheat treatment process.

(b) What properties can be acquired by steel after tempering? 

(c) Brief various tempering processes.

(d) What are the effects of tempering temperature on mechanical properties of steel?

6. Explain the process of martemperi. Compare and Contrast it with austempering process.

7. (a) Differentiate between hardness and hardenability.

(b) Outline the significance of hardenability.

(c) Explain the Jominy end-quench. method of determining hardenability.

(d) List the factors affecting hardenability.

(e) Discuss the uses of hardenability curves.

On TTT and CCT Diagrams

8. (a) What do you understand by isothermal transformation?

(b) What are TTT diagrams?

(c) How a TTT diagram is drawn?

(d) Draw a neat sketch of the TTT diagram for a eutectoid steel and label the regions. Mark the different products formed on this diagram.

9. (a) What is a CCT diagram?

(b) Describe various cooling curves on TTT diagrams. How such curves are drawn?

(c) Write short notes on critical cooling rate.

On Case Hardening (or Surface Heat Treatment)

10. Write short notes on the following surface heat treatment operations:

(a) Carburising,

(b) Nitriding,

(c) Cyaniding, and 

(d) Carbonitriding.

11. What is meant by carburising of steels? Briefly explain the various types of carburising.

12. Explain the process of nitriding. List and discuss the advantages of nitriding over carburising.

13. Compare and contrast various surface heat treatment techniques.

14. (a) Describe the flame hardening process with the aid of neat ninis sketch.

(b) List its advantages, disadvantages, and applications of flame hardening.

15. (a) Outline the principle of high frequency induction hardening. 

(b) Compare and contrast induction hardening with flame no hardening.

16. Certain defects can be expected following heat treatment processes. What are these defects? Explain the reasons of their development.