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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

Course Code: ME309

Course Name: METALLURGY MATERIALS SCIENCE (AU)

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any threefull questions, each carries 10 marks Marks
1a) Give the classification of crystal structures and its characteristics. (8) b) Name the seven crystal
systems in metallurgy. (2) 2 a) What do you understand by MILLER INDICES? Explain Miller
indices for (5) planes and Miller indices for directions.

b) Explain the deforrnation of crystals with reference to slip and twinning. (5) 3 a) Name the
different X-ray diffraction techniques and explain any one of them. (6) b) Sketch the Scanning
Electron Microscope and name the important parts. (4) 4 a) What is crystal imperfection? Classify
and explain any one dislocation with (7) neat sketch.

b) Write the steps involved in preparation of the sample for metallographic (3) examination.

PART 13
Answer any threefull questions, each carries 10 marks
5 ‏(ہ‎ Sketch an Iron-Carbon diagram and indicating the important phases and (8) reactions in
detail.
b) What are the stages in the mechanism of crystallization? (2)
6 93) Draw the "ITT curve and explain about its principle of construction. (8) b) Name the surface

heat treatment methods. (2)

7 2) Write a short note on cold working and hot working with a sketch. (8) 0) Mention about

TMT. = (2) 8 a) What is strain hardening? Discuss the mechanism of strain hardening. (7) b)

Define recovery, recrystallization and grain growth. (3)

PART ^
Answer anyfourfull questions, each carries 10 marks
9 What is the mechanism of fatigue? Draw the S-N curves for steel and explain (10) how
these curves are developed experimentally.
10 a) Differentiate between ductile and brittle fracture. (7) b) What is the protection that is

given against fracture of materials Q (3) 11 a) Name iile different types of composites and
explain any one of them with (8) suitable examples.

b) Name any four modern materials used in now days. (2) 12 a) Draw a typical "creep-test"
curve, showing different stages of elongation for a (8) long time high temperature creep test. State
how the information is helpful to the designer.

b) What is meant by maraging steel? (2)
13 a) What is meant by creep? and explain tile mechanism of creep deformation. (8) b)

What are smart materials? (2)

14 a) What are ലം factors affectingfatigues trength? (6) 0) What is DBTT? (4)