VTU Material Science & Metallurgy - June 2013 Exam Question Paper

VTU Mechanical Engineering (Semester 3)
Material Science & Metallurgy
June 2013

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) With neat sketch,explain body centered cubic face centered and closed packed hexagonal srtructures with exampe.

9 M

1 (b) Derive expresion for atomic packing factor of BCC,FCC and HCP structure

7 M

1 (c) Briefly explain the different types of point defects

4 M

2 (a) With the help of stress -strain digram.expalin the behaviour of ductile and brittle materials

8 M

2 (b) The follwing data have been obatined in hardness test of speciments.calculate the hardness number.assume dia of ball indentor =10mm.

Material	types	Load (kgf)	impression(mgf)
A	brinells	500	4.6
B	vickers	5	0.28

6 M

2 (c) Define the following terms Thoughness,Resiliance ,Proof stress and ductility.

6 M

3 (a) With neat digram , explain the frature in the following:
Ductile
Brittle
Fatigue

12 M

3 (b) Explain the three stages of creep with a neat sketch and its characteristic

8 M

4 (a) with net diagram ,explain the process of nuclation

4 M

4 (b) Write a note on Gibbs phase rule with an example

4 M

4 (c) with the help of cooling curve,explain how solidification process begins in pure metals

6 M

4 (d) Briefly explain the rules behind the solid solubility

5 M

5 (a) Construct the Ag-Cu phase diagram using following data;
Melting point of Ag=960.5°c
Melting point of Cu=1085°C
Eutectic point=779.4°c
Eutectic compoistion =28.1%Cu
Maximum solubilty of Ag in Cu and Cu in Ag is 8%
maximum solubilty of Cu in Ag in Cu is 2%.Assume the liquids ,solidus and solves lines are stright .calculate:
Amount of eutectic in 20% Cu,80%Ag alloy at 700°c and
Percentage and composition of solid phase in 60%Cu and 40% Ag alloy 400°C.

10 M

5 (b) What is level rule?Explain how it is useful.

5 M

5 (c) What is phase diagrams?how are they classified?

5 M

6 (a) Draw Iron -carbon equlibrium diagram and explain primary crystallization of steel hypoeutectic cast iron hypereutectic cast iron

10 M

6 (b) Define the following anneling ,normalization,tempring ,carburizing and nitriding

10 M

7 (a) How cast iron classified ?What are the properties of cast iron?

8 M

7 (b) How generally steels are classified ?consider at least two compostion mixture .mention its application and advantages

6 M

7 (c) Explain the composition ,properties and used of at least two copper based alloys

6 M

8 (a) Derive an expresion for load distribution in a composite for longitudianal loading of fiber reinforced composite

10 M

8 (b) With a neat diagram ,explain the hand laminating process

10 M

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