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Materials Engineering & Their Processing (April 2010)

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Total No. of Questions : 12] P1513 [Total No. of Pages : 4 [3764]-136 B.E. (Mech.) MATERIALS ENGG. AND THEIR PROCESSING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) A slowly cooled plain carbon steel has proeutectoid ferrite to be 10% of its eutectoid ferrite. What is the carbon content of steel? [6] b) Explain the effect of following factors on the properties of steel. i) Shape of proeutectoid ferrite. ii) Shape of proeutectoid cementite. iii) Hardness of ferrite and cementite. c) Compare and contrast Austenitic and Ferritic stainless steels with respect to composition, properties and applications. [6] OR Draw the microstructure of annealed steel. Explain the effect of carbon on mechanical properties of annealed steel. [6] Q2) a) [6] b) Give the classification of tool steels and state two applications of each. Why tool steels are multitempered? [6] c) Draw Fe - Fe3C phase equilibrium diagram and label properly. Explain [6] the significance of Fe - Fe3C phase equilibrium diagram. Q3) a) Draw the TTT curve for hypoeutectoid steel and explain the following heat-treatments. [6] i) Austempering ii) Marquenching P.T.O. 1 b) c) Q4) a) Draw CCT curve for eutectoid steel. Explain how this curve is used to obtain fine and course pearlite. [4] What is nitriding? Why nitriding is done at lower temperature? State the advantages of nitriding. [6] OR Explain the principle of carburising. State the post carburising heattreatments and explain any one heat-treatment. [6] b) Explain the transformation of autenite to pearlite and bainite. c) Draw microstructures of the following and label the phases (Any Three). [6] i) Slowly cooled 1.2% carbon steel. ii) Ferritic Grey cast iron. iii) Annealed 0.4% carbon steel. iv) Widmanstatten structure for 0.6% c steel. Q5) a) Classify the cast irons and two applications of each. Explain the steps in production of S.G. iron. [6] b) Draw the phase diagram of Cu- Zn alloy and explain the properties [6] and applications of single and double phase alloys. c) Why cast irons posses better castability than steels? [4] OR Give chemical composition and applications of the following (Any Three): [6] i) Cartridge brass. ii) Muntz metal. iii) Duralumin. iv) Elinvar. v) AISI 4320. Q6) a) [4] vi) White cast iron. b) Explain the factors affecting the graphitization of Grey cast iron. [4] c) State suitable material for the following and give reason. (Any Three).[6] i) Guard for electric motor. ii) Bed for machine tool. iii) Heating elements. iv) Piston.. [3764]-136 2 -2- SECTION - II Q7) a) Give the classification of composite materials. Explain metal matrix composite with one example. [6] b) Compare and contrast the composite and nano materials. [6] c) Classify the ceramics and state their properties. What is the difference between ceramics and cermets? [6] OR Q8) a) Explain with neat sketch hand lay up moulding. State its limitation and advantages. [6] b) Explain the effect of following on the properties of composites (Any Three). [6] i) Amount of fibers. ii) Type of fibers. iii) Orientation of fibers. iv) Manufacturing process. c) Explain the characteristics of the following fibers (Any Three). i) Silicon carbid. ii) Aramid. iii) Glass. iv) Graphite. [6] Q9) a) What is DLC coating? State advantages and limitations of DLC coating. [4] b) Compare and contrast adhesive and abrasive wear with two examples. [4] c) What is hard facing? State its advantages and limitations. d) Explain with neat sketch the process of PVD coating. State two applications. [4] OR Explain with neat sketch CVD coating. State its advantages. [4] Q10)a) [4] b) Why cleaning is necessary before coating? Explain electroless plating process. [4] c) Compare and contrast between chromate and phosphate coating. [4] d) Explain with neat sketch plasma spraying process. [3764]-136 3 -3- [4] Q11)a) What is liquid crystal polymer? State its properties and applications.[6] b) How nano materials posses wide range of properties? Explain with one example. [6] c) Distinguish between single walled and multiwalled nanotubes. [4] OR State the synthesis methods used for nanomaterials. Explain with sketch electric arc method. [6] Q12)a) b) Define fullerense. Explain the effect of carbon atoms on the fullerense.[4] c) State the types of biomeric tissue attachment with two examples. [4] d) What is shape memory alloy? [3764]-136 4 -4- [2]

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Additional Info : 2003 Course
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