Shivaji University 2006 B.E Mechanical Engineering S.E(Mechanical)(part-IV), METALLURGY - Question Paper

S.E(Mechanical)(part-IV)Examination,2006
Subject:METALLURGY
Time:3 Hours.
Marks:100

Instructions:
1)Attempt any 3 ques. from every part.
2)Draw neat figures wherever necessary.


1.Explain the subsequent terms(any six): [Marks 6*3=18]
1)Dendrites
2)Degrees of freedom
3)Resilience
4)Austenite
5)Endurance limit
6)Solid solutions
7)Coaring
8)Intermetallin compounds
9)Metallic bonds

2.a)Draw neat sketch of Fe-Fe3C diagram.Show compositions, temperatures, phases and phase reaction on the diagram.[Marks 10]

b)Describe diffrent standard specifications for steel with examples.[Marks 6]

3.Explain why(any four):[Marks 4*4=16]
1)FCC metals are more ductile than BCC metal?

2)Babit alloy is best for bush bearings?

3)Fatigue failure is most dangerous?

4)Cast irons have damping capacity?

5)18/8 stainless steels are nonmagnetic?

6)Soft Austenetic Hard field Manganese steel is used for wear applications?

4.Write a note (any four):[Marks 4*4=16]
1)Chilled cast iron
2)Non sparking tools
3)Pb-Sn alloys
4)alpha-beta brasses
5)Ultrasonic test
6)Creep test

5.a)What are TTT diagrams? discuss the experiment used for drawing a TTT diagram for eutectoid steel. What is the utility of
TTT diagrams in heat treatment?[Marks 9]

b)What is annealing? elaborate it's purposes?Classify annealing on the basis of heating temperatures? elaborate the diffrent kinds
of annealing?Explain with diagrams wherever required?[Marks 9]

6.a)What is precipitation hardening? How is it carried out? elaborate the basic requirements of precipitation hardenable alloys?[Marks 8]

b)What are diffrent kinds of quenching baths used in hardening of steels? elaborate property requirements of quenching baths?[Marks 4]

c)What are controlled atmosperes? Why is it necessary to use controlled atmosperes in heat treatment.[Marks 4]

7.Draw self explanatory sketches(any four):[Marks 4*4=16]
a)Mechanism of transformation of austenite into pearlite.

b)Types of hardening indicated on TTT diagram

c)Microstructures of Annealed and normalized steels for 0.4% C steel.

d)Types of mixers/blenders in powder metallury.

e)Flow chart for manufacturing of self lubricating bearings.

8.Write short notes(any four):[Marks 4*4=16]
a)Types of powder manufacturing

b)Compaction of P?M parts

c)Sintered aluminium products.

d)Nitriding

e)Heat treatment furnaces.

Earning:   Approval pending.