Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV ALLOY STEELS Previous Question Paper (December - 2019 - 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 as sub questions.
PART - A
Draw the microstructure of dual phase steels. Label all the phases and give its uses.
Answer
The microstructure of dual-phase steel consists of a soft, ductile ferrite matrix containing islands of hard martensite. It is primarily used in the automotive industry for structural components and safety parts due to its high tensile strength and excellent formability.
List out the uses of TRIP steels.
Answer
TRIP (Transformation Induced Plasticity) steels are used for: 1) Automotive structural parts like side impact beams and cross members due to high energy absorption. 2) Deep-drawn components requiring high formability. 3) Applications requiring a combination of high strength and high ductility.
What are semi austenitic steels? Give examples.
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What are the drawbacks of stainless steels?
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What are the alloying elements in 18% Nickel steels?
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What are the alloying elements in 20% Nickel steels and its uses?
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What are the corrosion resistant steels used in oil and gas plants?
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Give examples of rail steels.
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Where are the low alloy steels used in nuclear reactors?
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Where are the martensitic steels used in nuclear reactors and why.
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PART - B
What are trip steels? Explain the heat treatment and give their applications.
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Discuss about bainitic steels and the role of alloying elements in them.
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What are the interstitial elements in steels? Explain their role.
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Compare low carbon and high carbon bainitic steels.
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Classify martensitic stainless steels and write their compositions. List out their properties and uses.
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Classify Austenitic stainless steels and write their compositions. List out their properties and uses.
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Discuss about the following with respect to composition, properties and uses.
Duplex steels
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Precipitation hardening steels
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Discuss about the following with respect to composition, heat treatment and uses.
18% Nickel steels
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20% Nickel steels
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Explain the role of alloying elements in maraging steels.
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Compare the different types of maraging steels.
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Discuss the different steels used for various equipment in Oil and Gas industry.
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Discuss the different steels used for various equipment used in fossil fired power plants.
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List out the materials used for various components of nuclear fission reactors, with their composition.
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Explain the alloy steels used in them with justification.
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List out the uses of Nuclear reactors. Classify them.
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What are the components of a Nuclear fusion reactors and the materials used for their construction.
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