Engineering Metallurgy - Dec 2016

Mechanical Engg (Semester 4)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.

Solve any one question from Q.1(a,b,c) &Q.2(a,b, c)

1(a) Draw a neat, well labelled schematic TTT curve from medium cabon steel.(4 marks) 1(b) What is meant by alloy steel? State different types of stainless steel and give composition of 304SS.(4 marks) 1(c) Explain different steel specifications, with suitable example.(5 marks) 2(a) Differentiate between Microscopic and Microscopic examination(4 marks) 2(b) Define etching and state etching reagents for ferrous and non- ferrous metals.(4 marks) 2(c) Draw Iron-Iron Carbide equilibrium diagram, showing all details.(5 marks)

Solve any one question from Q.3(a,b,c) &Q.4(a,b, c)

3(a) Draw a schematic diagram showing all details of Metallurgical microscope.(4 marks) 3(b) State the importance of hardnability of steel, it depends on hich factors.(4 marks) 3(c) Explain mechanism of corrosion with suitable figure.(4 marks) 4(a) Classify surface hardening treatments and explain induction hardening.(4 marks) 4(b) Explain Crevice corrosion method. How can it be prevented?(4 marks)

Solve any one question from Q.5(a,b,c) &Q.6(a,b, c)

4(c) What is inter-granular corrosion, explain with figure.(4 marks) 5(a) What is 'malleabilising' heat treatment? To which type of cast iron is it given?(4 marks) 5(b) Differentiate between white cast iron and nodular cast iron.(4 marks) 5(c) Explain how modification in design will improve corrosion resistance.(5 marks) 6(a) Draw the microstructure of Nodular Cast iron and state two applications of it.(4 marks) 6(b) Why is Grey cast iron found commonly in columns but not in structural beams?(4 marks) 6(c) What is meant by 'inculation' in context of cast irons? Why is it done?(5 marks)

Solve any one question from Q.7(a,b,c) &Q.8(a,b, c)

7(a) Write a short note on bearing materials. State any two materials.(4 marks) 7(b) Draw a necessary phase diagram for brass, showing all phases.(4 marks) 7(c) Why is aluminimum called as a corrosion resistance metal?(4 marks) 8(a) Differentiate between brass and bronze.(4 marks) 8(b) Explain the heat treatment given in case of Aluminimum alloys.(4 marks) 8(c) Write a short note on double tempering. Where is it needed?(4 marks)