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Posted By: Arun Jadhav Member Level: Diamond Posted Date: 20 Dec 2007
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2006 Shivaji University B.E S.E(Mechanical)(part-IV)Examination,2006 METALLURGY Question paper
S.E(Mechanical)(part-IV)Examination,2006
Subject:METALLURGY
Time:3 Hours.
Marks:100
Instructions:
1)Attempt any three questions from each section.
2)Draw neat figures wherever necessary.
1.Explain the following 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? Explain 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? What are it's purposes?Classify annealing on the basis of heating temperatures? What are the diffrent types
of annealing?Explain with diagrams wherever required?[Marks 9]
6.a)What is precipitation hardening? How is it carried out? What are the basic requirements of precipitation hardenable alloys?[Marks 8]
b)What are diffrent types of quenching baths used in hardening of steels? What are 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.
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