Material Technology - Dec 2014

Mechanical Engineering (Semester 4)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Write short note on any four of the following:-

1 (a) Burgers vector(5 marks) 1 (b) Creep Resistant Materials(5 marks) 1 (c) Important of Iron as engineering material(5 marks) 1 (d) Managing heat treatment process(5 marks) 1 (e) Classification of alloying elements(5 marks) 1 (f) Composite materials(5 marks) 2 (a) Draw and explain Isomorphous and Eutectoid Phase diagrams.(8 marks) 2 (b) Explain the process of dislocation by Frank Read source.(6 marks) 2 (c) Explain Andrade's analysis of the classical creep curve.(6 marks) 3 (a) What is Surface hardening? Name its different methods. Discuss any one method in detail.(8 marks) 3 (b) Draw a neat and labelled microstructure of White Cast Iron, Grey Cast Iron and Nodular Cast Iron.(6 marks) 3 (c) What is Critical Resolved Shear Stress? Derive the expression for Critical Resolved Shear Stress for deformation by slip.(6 marks) 4 (a) Explain the stages of recrystallization annealing and factors affecting it.(8 marks) 4 (b) Discuss the Subzero heat treatment of Steel.(6 marks) 4 (c) What are the limitations of Plain Carbon Steel? Explain the effect of alloying elements on phase transformation.(6 marks) 5 (a) State Griffth's theory of brittle fracture and derive Griffth's equation.(8 marks) 5 (b) Discuss the Full Annealing heat treatment of Steel.(6 marks) 5 (b) Give classification on stainless steel.(6 marks) 6 (a) Draw neat Iron-Iron Carbide Equilibrium diagram indicating all important temperature, phase and composition.(8 marks) 6 (b) Explain fatigue limit for ferrous and non-ferrous alloys with the help of S-N diagram.(6 marks) 6 (c) What are Nano Materials? Write a note on Nano Composites.(6 marks)