Anna University Chennai 2005 B.E Mechanical Engineering /B.TECH :Applied material science - exam paper

B.E/B.TECH. DEGREE exam ,NOV/DEC 2005
Fourth semester ,Mechanical engineering
Applied material science


TIME: 3Hrs
MAXIMUM: 100 marks


PART A (10 X2 =20)

1. elaborate miller indices?

2. What is edge dislocation?

3. What is meant by ductile fracture?

4. What is creep?

5. State Gibbs phase rule?

6. elaborate the possible microstructures of iron ans steel?

7. elaborate the uses of high resistivity materials?

8. What is the chemical composition of constatan? elaborate its uses?

9. What is nitriding?

10. What is flame hardening?


PART B (5 X 16 =80)

11. explain any 2 thermal methods of producing surface hardening of steel

12 (a) What packing fraction? Prove that the packing faction of HCP is 0.74

OR

(b) Write note on crystal imperfections. Bring out the difference ranging from edge dislocation and screw dislocation.

13. (a) discuss in detail the mechanism of brittle fracture. Bring out the difference ranging from brittle and ductile kind of fractures.

OR

(b) explain the differential stages in creep curve . elaborate the variables that affect creep resistnt materials?

14 (a) explain the transformation of austinite when cooled out different cooling rates based on T-T-T diagram.Explain critical cooling rate

OR

(b) provide the classification of plain carbon steels and cast iron based on composition and application.

15 (a) elaborate the applications of high resistivity alloys? Name 3 such alloys ,list out their properties and uses.

OR

(b) elaborate super hard materials ?How are tungsten carbides and boron nitrides prepared ? elaborate their uses?

Earning:   Approval pending.