Pune University Question Paper (Sem-2) 2012

S.E. 2012 (Mechanical Engg. )
Engineering metallurgy
(Semester - II)

Q1) a) What are the advantages of alloy steels over plain carbon steel [04]
b) Draw an equilibrium diagram for Ag-Cu system which are partially soluble in the soli
state.The data is as follows:-
Melting temp. of Ag - 961°C, Melting temp. of Cu – 1083°C, Eutectic composition-
28.1% Cu, Eutectic temp. - 780°C, Solubility of Cu in Ag – 8.8% Cu at 780°C,
Solubility of Ag in Cu – 92.1%Cu. The solubility in both decreases to 2% at room
temperature. Discuss slow cooling of alloy with 6% Cu from liquidus temperature.
[06]
c) Explain the weld decay in stainless steels [03]
OR

Q2) a) Draw Iron carbon equilibrium diagram [04]
b) Draw the microstructures of : 1) AISI 1020 steel [02]
c) State the Hume Rothery’s rules of solid solubility [04]
d) What is coring ? Which alloys show cored structures ? [03]

Q3) a) Explain secondary hardening [02]
b) What are the advantages and disadvantages of Induction hardening over Flame
hardening
[04]
c) Explain how corrosion can be prevented by taking care in proper design [3]
d) Explain what is anodic protection [3]
OR

Q4) a) Draw self explanatory diagram for any one of the below 1] Ausforming 2]
Martempering
[02]
b) Write short notes on ( Any one ) : 1] Carbonitriding 2) nitriding [04]
c) Explain min 4 types of corrosion . [04]
d) What is cathodic inhabitors [02]

Q5) a) What is chilled cast Iron ,how it is produced? Give its applications ? [04]
b) Draw microstructure : 1] Ferritic Speroidal gray cast iron, 2) 4.3 eutectic cast Iron [04]
c) Explain the cooling of 3.5 % carbon cast Iron from its melting temperature till
room temperature.
[04]
OR

Q6) a) What is Equivalent carbon in cast Iron. Explain role of individual element present in
Equivalent carbon in cast iron .
[04]
b) Compare S.G. iron and Malleable iron with respect to microstructure, production,
composition and one application each.
[04]
c) What are the advantages of cast iron over steels? [04]

Q7) a) Give typical composition, property and application for the following ( any four) :
1] LM14 2]Invar 3]statuary bronze 4]cartridge brass 5) Gun metal
[12]
b) Ni is used in measuring equipment justify its property for this application . [1]
OR

Q8) a) Explain classification of Cu base alloys based on the percentage of Cu and Zn?
Explain role of Zn in brasses
[04]
b) Write short note on 1) Dezincification 2)coring in Sn bronzes [04]
c) What are the requirements of bearing materials ? explain with suitable example [05