Anna University Heat Treatment Exam Question Paper

Anna University Heat Treatment Exam Question Paper

METALLURGICAL ENGINEERING

 TIME – 3 Hours                                                                         MAXIMUM : 100 Marks

PART – A                                                                                     Marks = (10 x 2 = 20 Marks)

ANSWER ALL QUESTIONS

1.Write the Ms temperature equation.  Calculate the Ms temperature for a carbon steel with 0.2C, 0.4 Si, 0.7Mn and for an alloy with 0.2C, 0.4Si, 0.7Mn, 1,0%Cr and 0.3%Mo.

2.What do you mean by white layer in nit riding process ?

3.What is the difference between harden ability and hardness.                      

4.What is need for sub zero treatment?

5.What are the application of carbonitriding?                          

7.Why we are not heat treating ferritic stainless steels.

8.Why the carbon content is restricted to 6.67% in the Iron-Carbon diagram.

9.Why we are not heating the hyper eutectoid steels above the upper critical temperature for annealing.

.Draw the microstructure of a 0.4% carbon steel

(a) Annealed  (b) Normalized and (c) Hardened condition.

10.Why we are not hardening mild steel.

                                                                                                                                                                                                                                                                                                                                                            PART – B                                      (5 X 16 = 80 Marks)

 

11. (a) Discuss in detail the mechanism of pearlitic and bainitic

transformation.                                                                                              (8)

 

(b) How to develop the TTT diagram.  Draw the TTT diagram for an

eutectoid steel and explain the various factors affecting it.                     (8)

 

 

12.(a) Discuss in detail the heat treatment temperature, holding time,

microstructural  changes for annealing, normalising, hardening

and tempering for a 0.2% carbon steel, 0.8% carbon steel,

1.2% carbon steel.                                                                                        (16)

( OR )

          (b) Discuss briefly Jominy End quench test and hardenability testing

based on ASTM Number and chemical composition.                           (16)

 

13. (a) (i) Give a detailed account of gas carburizing.                                         (8)

 

(ii) Explain in detail different methods of Nitriding and give the

advantages and   limitations.                                                                       (8)

 

( OR )

      (b) (i) Discuss in detail silionising, chronising and boronising processes.     (8)

 

(ii) Explain flame hardening and induction hardening with neat

sketches. (8)

 

14. (a)(i) Give a detailed account of various quenching media’s used and

their characteristics                                                                                      (8)

 

(ii)  Give a detailed account of various types of furnace atmospheres.    (8)

 

( OR )

 

(b) (i)  List the various types of heat treatment furnaces and explain the

working of fluidised bed heat treatment furnace.                                    (8)

 

(ii) Discuss in detail about temperature control in heat treatment

furnaces.                                                                                                       (8)

 

15. (a)(i) Explain in detail heat treatment of white cast iron and grey cast iron.  (8)

(ii)Give the typical heat treatment for a high speed tool steep and

explain the different steps.                                                                            (8)

                        ( OR )

 

(b)(i) Discuss in detail precipitation hardening of an aluminium copper alloy.(8)

(ii) List the various defects normally observed in heat treated parts and

discuss the causes and remedies for any four such defects.                (8)

 

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