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Printed Pages: 02
Paper Id: 140301
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Subject Code: RME301
Roll No:
B TECH
(SEM-III) THEORY EXAMINATION, 2018-19
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MATERIAL SCIENCE
Time: 3 Hours
Total Marks: 70
Notes: Assume any Missing Data.
SECTION-A
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(2x7 = 14)
- a) Define recrystallization temperature?
- b) Define 'critical cooling rate' in TTT diagram with neat sketch.
- c) What are refractory materials? Give some examples.
- d) Define the term strain hardening.
- e) Differentiate between toughness and resilience. Also define the endurance limit.
- f) Why hardening is followed by tempering?
- g) What are Bravai's space lattices?
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SECTION B
(7x3=21)
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- a) Define the term diffusion. Explain Fick's law in case of steady state diffusion.
- b) What is non-destructive testing (NDT)? Explain in detail any two NDT methods.
- c) What is phase diagram? Draw a neat sketch of iron-carbon diagram and explain the various phases present in it and the important reactions occurring.
- d) What do you mean by heat treatment process? Name various types of hardening processes and explain in detail Nitriding process with its merits and demerits.
- e) What are Ceramics? What are different types of ceramics? Also write their properties.
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SECTION C
(7x1=7)
- a) How many atoms per square millimeter are there on the (100) plane of lead. Lead has FCC structure. Assume the interatomic distance to be 3.499 Å.
- b) NaCl structure has FCC structure. The density of NaCl is 2.18 cm³. Calculate the distance between two adjacent atoms.
(7x1=7)
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- a) What is a dislocation? What are different types of dislocation? Explain. Draw their neat sketches and mark burger vector in each case.
- b) Explain the term creep, its mechanism and stages.
(7x1=7)
- a) Write short notes on Solid solution and its types.
- b) What do you understand by lever rule? Determine the mass fraction of the phases present at 184°C in a sample of lead & tin with 45% tin in it.
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(7x1=7)
- a) Draw and explain the TTT diagram for eutectoid steel. Explain important transformations taking place in it on cooling.
- b) What are brasses and bronzes? How are they classified? Give the composition, properties, microstructure and applications of any two of each.
(7x1=7)
- a) What are various methods of plastic processing?
- b) Explain in detail classification and applications of composite materials.
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