JNTU
JNTU B.Tech II PHYSICAL METALLURGY Previous Question Paper (November/December - 2018 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
PART A
Answer all questions
What is the importance of miller indices?
Answer
Miller indices are essential for uniquely identifying specific crystallographic planes and directions within a crystal lattice. They provide a standardized notation that simplifies the description of atomic arrangements, slip systems, and diffraction patterns in materials science.
What is coordination number? Give coordination number of BCC and FCC crystal structures.
Answer
The coordination number is the number of nearest neighbor atoms touching a central atom in a crystal structure. For a Body-Centered Cubic (BCC) structure, the coordination number is 8, and for a Face-Centered Cubic (FCC) structure, it is 12.
What is coring?
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What is phase rule and explain its importance of phase rule?
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What is the full form of ASTM?
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How strength of a material depends on grain size?
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Define austenite.
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What are the factors that affect nose of an IT curve?
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What is critical cooling rate?
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What do you mean by pearlite and how pearlite structure appears?
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PART B
Calculate the atomic packing factor for BCC and FCC crystals structures.
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Define the terms space lattice, unit cell and lattice parameters. What is the significance these terms in crystallography?
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Describe the mechanism of crystallization process.
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Discuss why metals with FCC crystal structure are more ductile than BCC and HCP metals.
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Construct an isomorphous system with the help of an example and label the phases in it.
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Discuss about dispersion strengthening.
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What are the applications of phase diagrams?
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Explain about the miscibility gap in phase diagrams.
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How do the grain growth and the grain size vary in the process of recovery and recrystalization?
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What is an interstitial solid solution? Name the five elements which commonly form interstitial solid solutions?
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What is difference between random and ordered Solid Solutions? Explain with suitable examples.
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Determine the pro-eutectoid ferrite, eutectoid ferrite and eutectoid cementite of 0.6 wt.% hypo-eutectoid steels at 720°C.
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How do the alloying elements affect the phase diagrams?
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Define and explain the properties of the following: a) Ferrite b) Austenite c) Martensite d) Leduburite.
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Explain the continuous cooling transformation of 0.8%C steel with the help of TTT diagram.
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Explain the transformation of austenite to pearlite with the help of neat sketches.
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How do the alloying elements affect the transformation kinetics?
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