JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV B.TECH II SEM–REGULAR/SUPPLEMENTARY EXAMINATIONS MAY - 2010 SUPER ALLOYS (METALLURGY & MATERIAL TECHNOLOGY) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --1.a) b)
What is a super alloy? What are the important properties of a super alloy? Discuss them in detail. Explain the guidelines for the selection of any super alloy for any intended use. [8+8]
2.
What is the meaning of heat resistant alloy? What is the criterion to identify the heat resistant alloys? Give a typical list of cast and wrought heat resistant alloys. Explain their properties and important applications. [16]
3.
Explain about various forms of high temperature corrosion and high temperature coatings of super alloys. [16]
4.
What are the major alloying elements that may be present in nickel base alloys? Explain about them in detail. Also show their micro structures. [16]
5.a)
Explain about the electron beam cold hearth refining of super alloys. Also mention its advantages & disadvantages. Discuss how super alloy scrap is released and melted as a raw material during melting practice of super alloys. [8+8]
b)
6.
What is super plasticity? How is it different from the conventional plastic deformation? What are the necessary conditions required for the super plastic forming of super alloys. Discuss the super plastic behavior of super alloys. [16]
7.a)
What are single and poly crystals? Explain with neat sketches? Discuss their relative advantages & disadvantages. What is investment casting process? Explain the working principle of the process. Discuss the process with reference to super alloy components. [8+8]
b)
8.
Write short notes on the following: a) Quality of super alloy castings & evaluation b) Heat resisting alloys & their heat treatment. ******
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[16]
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Code.No: R05421802
R05
SET-2
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV B.TECH II SEM–REGULAR/SUPPLEMENTARY EXAMINATIONS MAY - 2010 SUPER ALLOYS (METALLURGY & MATERIAL TECHNOLOGY) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks ---
1.
Write an essay on the classification of super alloys. Explain about them.
2.a) b)
Explain about the development of nickel base wrought super alloys. Explain why there is a great need for more heat resistant materials in the areas of air craft engine turbo super chargers and gas turbine engines. What type of super alloys are used in those applications? Give the composition, properties of these super alloys. [8+8]
3.a) b)
Discuss in general the fracture properties of super alloys. What are the various general methods by which the corrosion may be prevented or reduced in various types of super alloys? Explain them. [8+8]
4.a)
Explain the effect of MC carbides, M23C6, M6C on the micro structure and properties of nickel base super alloys. Explain how do you control grain size in cast super alloys. [10+6]
b)
[16]
5.
Draw a neat sketch of vacuum induction meeting furnace. Name the various parts in it. Explain the working principle of the furnace. Discuss the advantages & disadvantages of this process over other melting practices. [16]
6.
Write an essay on various thermo-mechanical processing techniques used for the processing of various super alloys. Discuss their relative advantages and disadvantages. [16]
7.a)
Draw how a dendritic structure looks. What are the detrimental effects of such a structure? How it can be reduced/eliminated. Discuss the effect of grain size on the properties of cast super alloys. [8+8]
b) 8.
a)
b)
Explain how the quality of super alloy products can be maintained by ultra sonic flaw detection method. Explain the working principle of ultrasonic flow detection method. Which super alloys can be age hardened? Explain age hardening of any of the heat resisting alloys. [16] ******
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Code.No: R05421802
R05
SET-3
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV B.TECH II SEM–REGULAR/SUPPLEMENTARY EXAMINATIONS MAY - 2010 SUPER ALLOYS (METALLURGY & MATERIAL TECHNOLOGY) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --1.a) b)
2.a) b)
3.a) b) 4.a)
b) 5.
6.a) b)
What are the various applications of super alloys? Discuss why a particular super alloy is selected for a given application. Name typical applications where high temperatures are involved and use of super alloys is necessary. [8+8] Discuss the micro structural degradation of super alloys in normal operations above 7000C. Distinguish fully between cast super alloys and wrought super alloys with suitable examples. [8+8] Explain about the working principle of crucible test to study hot corrosion behavior of super alloys. Explain about stress rupture strength of super alloys. [9+7] Explain about the following phases in Ni-Fe super alloys. σ i) ii) μ iii) Laves Explain how gamma prime ( γ ′ ) strengthening takes place in nimonic alloys.[8+8] Explain in detail the melting and refining process in general for various types of super alloys indicating the furnaces used, their refractory lining and other details. [16] With a neat sketch, explain the working principle of hot isostatic pressing process with respect to different super alloys. Explain why powder metallurgy is indispensable for the manufacture of certain super alloy components. [8+8]
7.a) b)
Distinguish between fine grain size & coarse grain size. Distinguish between positive segregation & negative segregation.
[16]
8.
Write short notes on the following: a) Protective atmospheres-melting super alloys. b) Gamma ray radiography c) Magnetic particle method.
[16]
******
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Code.No: R05421802
R05
SET-4
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV B.TECH II SEM–REGULAR/SUPPLEMENTARY EXAMINATIONS MAY - 2010 SUPER ALLOYS (METALLURGY & MATERIAL TECHNOLOGY) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --1.a) b)
Explain the function of different alloy additions made to super alloys. Name any two wrought super alloys. Give their composition, microstructure, properties and applications. [8+8]
2.a) b)
What is sigma phase? What is its effect on the properties of stainless steels? What would be the desirable properties of second phase precipitates in super alloys. Would non-metallic inclusions such as oxide particles be the useful constituents in such an alloy? Discuss. [8+8]
3.a)
Explain clearly between brittle fracture and ductile fracture with reference to super alloys. Discuss how fracture takes place in Inconel alloy and martensetic stainless steels. [8+8]
b)
4.a) b)
Explain the various distinct trends developed in microstructure in nickel base alloys, to meet the stringent strength requirements. Explain about the coherent & incoherent lattice structures. [8+8]
5.a) b)
Explain what do you mean by duplex super alloy melting practice. Explain the various precautions that are to be taken to avoid contamination of super alloys by the harmful trace elements like Pb, Sn, Sb etc. [8+8]
6.a)
What are the important aims of cold working of super alloys? Discuss the advantages & disadvantages of cold working. Explain the various technological factors that are to be considered for the forging of super alloy rotor parts. [8+8]
b)
7.a) b) 8.
Write a detailed notes on the development of single crystal turbine blades. Also explain the properties and typical applications of turbine blades. Explain the various methods to produce single crystals of super alloys. [9+7] Write short notes on the following: a) NDT & important aims b) Piezo electric effect & Piezo electric crystals c) Classification of heat resistant alloys. ******
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(a) Explain how a server generates dynamic content. (b) Give a note on request time errors. [8+8]. 7. Java server pages simplify the delivery of dynamic web ...
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