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Material Science Question Paper - Jun 17 - Mechanical Engineering (Semester 3) - Visvesvaraya Technological University (VTU)
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Material Science - Jun 17
Mechanical Engineering (Semester 3)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Answer FIVE full questions, choosing one full question from each module.
(2) Draw neat diagrams wherever necessary.
Module-1
1.a.
With the help of stress-strain diagrams, breifly explain the ductile and brittle behaviour of engineering materials.
(8 marks)
00
1.b.
A 0.2% e steel component is to be carburized at $920^{o}C$.Claculate the time required to increase the carbon content at 0.5mm below the surface to 0.4%.
(8 marks)
00
$D920^{o}C = 1.28$ x $ 10^{-11} m^{2}/S$. Carbon content is 0.9% at the surface.
| z | 0.75 | 0.80 | 0.85 |
|---|---|---|---|
| enf(Z) | 0.7112 | 0.7421 | 0.7707 |
OR
2.a.
With a neat creep cruve, explain different stages of creep deformation.
(8 marks)
00
2.b.
Explain the mechanisms of fatigue failure in engineering materials with necessary diagram.
(8 marks)
00
Module-2
3.a.
What is meant by homogeous nucleation? Derive an expression for critical radius required for homegenous nucleation, with free energy curve
(8 marks)
00
3.b.
Explain substituional and interstitial solid solutions. Discuss Hume- Rothary rules governing formation of solid solutions.
(8 marks)
00
OR
4.a.
Draw a neat Iron-Carbon equllibrium phase diagram and label all phases, regions and invarinat phase.
(8 marks)
00
4.b.
Two metals A and B are completely soluble in liquid and partially soluble in solid state.Draw their phase diagram for following details.
(8 marks)
00
i)Solid solubility of B in A is 5% at $600^{o}C$ and $0^{o}C$ .
ii)Solid solubility of A in B is 10% at $600^{o}C$ and $0^{o}C$ .
iii)Eutectic is formed at 60% B.
Also find the liquid and solid phase percentages in an alloy with 20% B at$650^{o}C$ .
Module-3
5.a.
Draw a neat labelled TTT diagram for Eutectoid steel. Show a cooling curve for the formation of 100% marten site on it and explain the curve.
(8marks)
00
5.b.
Differentiate clearly between Normalizing and Annealing . Discuss Spheroidising Annealing with applications.
(8 marks)
00
OR
6.a.
With a neat diagram, explain inductin hardening process. Discuss the advantages,limitations and applications of the process.
(8 marks)
00
6.b.
Discuss on various types of Cast-Irones with necessary micro structures.
(8 marks)
00
Module-4
7.a.
Differentiaate between Thermo Settling and Thermoplasting Polymers. What are the advantages and disadvantages of plastic materials.
(8 marks)
00
7.b.
What is meant by Residual life assessment? Explain the non destructive testing methods useful for assessing residual life of materials.
(8 marks)
00
OR
8.a.
Describe shape memory alloys.Explain breifly the applications of shape memory alloys.
(8 marks)
00
8.b.
Classify Ceramic materials. Explain the application and processing method of any one class.
(8 marks)
00
Module-5
9.a.
Classify the composite materials on matrix and reinforcemen . List the roles of matrix, reinforcement and interface.
(8 marks)
00
9.b.
For a directionally oreinted fiber - reinforced composite,the Young's modulus in Iso-Strain and Iso-Stress condition are 33.1 Gpa and 3.66 Gpa respectively. For a fiber volume fraction of 0.30, determine the Young's modulus for fiber and matrix phases.
(8 marks)
00
OR
10.a.
With a neat figure, explain injection moulding process for particulate reinforced polymers.
(8 marks)
00
10.b.
List the advantages and limitations of composite materials. Mention any 4 applications of polymer matrix composite .
(8 marks)
00
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