Material Science & Metallurgy - May 2015
Mechanical Engineering (Semester 3)
TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) What are the engineering requirements of materials? Explain in detail.(7 marks) 1 (b) Explain Structure Property and Performance relationships with a suitable example.(7 marks) 2 (a) Differentiate under-cooling and constitutional super-cooling in context of solidification and its effect on final structure.(7 marks)
Answer any one question from Q2 (b) & Q2 (c)
2 (b) What are the various levels of structure? Explain in detail.(7 marks) 2 (c) Explain homogenous and heterogeneous nucleation with neat sketches.(7 marks)
Answer any two question from Q3 (a), (b) & Q3 (c), (d)
3 (a) What is strain hardening? Explain how the effect of strain hardening can be eliminated by recrystallization?(7 marks) 3 (b) Explain the three basic zones formed after solidification of alloys.(7 marks) 3 (c) What are the various methods of controlling grain structure during solidification? Explain in detail.(7 marks) 3 (d) What is Gibbs Phase Rule? Clearly explain all variables?(7 marks)
Answer any two question from Q4 (a), (b) & Q4 (c), (b)
4 (a) Explain substitutional solid solution and Hume Rothery Rule for the feasibility of it.(7 marks) 4 (b) Draw a neat and labeled Iron-Iron Carbide diagram and explain eutectic and eutectoid reaction in it.(7 marks) 4 (c) What is substitutional and interstitial solid solution. Why solubility of solute is limited in interstitial solid solution? Justify.(7 marks) 4 (d) What is plain carbon steel? Also explain all type of plain carbon steel with the composition and specific application.(7 marks)
Answer any two question from Q5(a), (b) & Q5 (c), (d)
5 (a) Explain the property requirement from a bearing material. Explain journal bearing material in detail.(7 marks) 5 (b) Draw and label TTT diagram for eutectoid steel and show annealing and normalizing in it. Explain the critical cooling rate with the help of TTT diagram.(7 marks) 5 (c) Explain the requirements of metal powders used in powder metallurgy. Also explain various methods of powder production.(7 marks) 5 (d) Explain the steps of Dye Penetrant Testing with neat sketch(7 marks)