VTU Previous Year Question Papers BE ME Materials Science and Metallurgy December 2011

VTU Previous Year Question Papers BE ME Third Semester

Materials Science and Metallurgy December 2011

 

Note: Answer any FIVE full questions, selecting atleast TWO questions from each part.

PART-A

1  a.  Define unit cell, coordination number, vacancy and grain boundary.

b.  Draw a neat sketch of a BCC unit cell. Derive the relation between lattice parameters and atomic radius for the BCC unit cell. Calculate its atomic packing factor.

c.   Explain edge dislocation, with the help of a neat sketch.

d.  Explain briefly the vacancy mechanism of diffusion.

 

2 a. Define engineering stress and true stress. Derive the relation between the two.

b.  A tensile specimen of 10mm diameter and 100mm gauge length is subjected to a tensile test. If its diameter is reduced to 8mm by applying a load of 1500N, what is its final length? Also determine engineering stress, engineering strain, true stress and true strain.

c.   Explain Vickers hardness testing, in brief.

d.  When a 3000 kg load is applied through a 10mm diameter ball in a Brinell test on steel, an indentation of 3.1 mm is produced. Determine the BHN of the metal.

 

3     a. Sketch the basic modes of fracture. List the differences between them.

b.  Explain with the help of a sketch, the fatigue behaviour of metals. State any three methods to improve fatigue resistance.

c.   With the help of a neat sketch, explain the different stages in a creep curve. Give two examples for creep resistant materials.

 

4     a. State Hume – Rothery rules that govern the formation of solid solutions.

b.  Draw neatly labeled sketches of eutectic phase diagrams for a binary system with i) no solid solubility and ii) partial solid solubility.

c.   Describe the phase rule and lever rule in brief.

d.  A binary alloy system contains two solid phases a and p at a particular temperature. The compositions of a and P are A – 5% B and A – 95% B respectively. Calculate the amount of a and p in i) A- 40% B alloy and ii) A – 70% B alloy at that temperature.

PART-B

5     a. Draw a neat labeled iron – carbon phase diagram. Write the three invariant reactions taking place in the system.

b.  Draw the schematic microstructures of slowly cooled eutectoid steel and hypo – eutectoid Steel.

c. Briefly explain the TTT diagram for eutectoid steel.

 

6 a. Compare annealing and normalizing heat treatments adopted for steels.

b.  Explain carburizing and flame hardening, in brief.

c.   Define hardenability. Explain with a neat sketch, the Jominy end quench test of determining the hardenability of steels.

 

7 a. Briefly describe the composition, properties and applications of medium and high carbon steels.

b.  State the properties and applications of gray cast iron.

c.  Write a note on brasses.

 

8 a. Define corrosion. State its effects.

Briefly explain the mechanism of corrosion.

c.  Write a note on passivity.

d.  List various methods of corrosion prevention. Explain cathodic protection with examples.

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