JNTU
JNTU B.Tech II MATERIAL SCIENCE AND METALLURGY Previous Question Paper (April/May - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Define unit cell.
Answer
A unit cell is the smallest repeating structural unit of a crystal lattice that, when stacked in three-dimensional space, generates the entire crystal structure.
Define slip.
Answer
Slip is the process of plastic deformation in crystalline materials where one part of the crystal slides over another along specific crystallographic planes (slip planes) in specific directions (slip directions) due to the movement of dislocations under shear stress.
Define alloy.
Answer
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What is the purpose of constructing the phase diagrams?
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Define heat treatment power.
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Define spheroidising.
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What do you mean by continuous cooling curves?
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Define carbo-nitriding.
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Write the chemical composition of stainless steels.
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What are the applications of tool steels?
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Part B
Explain two types of line defects in crystals with the help of neat diagrams and their importance in determining the plastic deformation of the material.
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Explain the procedure to find out critically resolved shear stress in a single crystal with the help of neat sketch.
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Explain the substitutional and interstitial solid solutions with neat sketches and suitable examples.
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Construct the Iron Iron-carbide phase diagram to scale and label the phases in it.
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Explain the procedure to construct Isothermal transformation diagrams for Fe-C alloys.
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Explain the purpose and procedure of the following heat treatment processes.
Normalizing
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Tempering.
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Explain the vacuum and plasma hardening processes with neat sketches.
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Explain the carburizing and nitriding processes with suitable chemical reactions that occur in these processes.
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List out the properties and applications of important aluminium and titanium alloys.
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Explain the microstructure, properties and applications of malleable and gray cast irons.
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