B E1125 Pages: 2

Page 1 of 2

Reg No.:_______________ Name:__________________________

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

V SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019

Course Code: ME309

Course Name: METALLURGY AND MATERIALS SCIENCE

Max. Marks: 100 Duration: 3 Hours

PART A Answer any three full questions, each carries 10marks. Marks

1 a) What are unit cells? (2)

b) What are crystals? Explain various crystal structure systems (8 )

2 a) What are slip and climb? Differentiate (4)

b) What are miller indices? Draw the following (110), (222), (011) and (123) in

different unit cells.

(6)

3 a) Explain homogeneous crystallization mechanisms (4)

b) Define grains and grain boundaries. How is grain size determined? What is

importance?

(6)

4 a) What Burgers vectors? How will you find out the burger vector in an edge

dislocated system?

(4)

b) What is a Frank Read Source? Explain the functioning. (6)

PART B

Answer any three full questions, each carries 10marks.

5 a) What are solid solutions (2 )

b) Explain isomorphous systems with clearly naming a suitable system. Explain

lever rule in the isomorphous system

(8 )

6 Explain CCT diagram of eutectoid steel with TTT diagram (10)

7 a) Explain carburizing and nitriding (6)

b) Differentiate hot working and cold working (4)

8 a) Explain the effects of alloying elements on steel with suitable examples (6)

b) Write short notes on HSS and Nickel steel (4)

PART C

Answer any four full questions, each carries 10marks.

9 a) Explain Fatigue. What are the factors affecting Fatigue? (6 )

b) Write short notes on stress raisers and stress concentrations (4 )

10 a) Explain trans and intergranular fractures (6 )

b) Write short on fracture toughness and crack tip intensity (4)

B E1125 Pages: 2

Page 2 of 2

11 What is creep? Explain creep curves and various creep mechanisms (10)

12 What are composites? Explain (10)

13 a) Write short notes on intermetallics and applications (3)

b) Write short notes on smart materials (4)

c) Discuss on nano materials (3)

14 a) What are biomaterials? (4)

b) Explain ceramic structures (6)

****

B R5938 Pages: 2

Page 1 of 2

Reg No.:_______________ Name:__________________________

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

V SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018

Course Code: ME309

Course Name: METALLURGY AND MATERIALS SCIENCE

Max. Marks: 100 Duration: 3 Hours

PART A Answer any three full questions, each carries 10 marks. Marks

1 a) What is space lattice? Define unit cells. (4 )

b) Define and find out the packing factor and coordination numbers for BCC and

FCC systems.

(6 )

2 a) What is polymorphism or allotropy? What is it’s importance on properties? (4)

b) Differentiate amorphous and crystalline structure. How crystalline properties will

effect on mechanical properties?

(6)

3 a) Explain plastic deformation by slip and twining. (6)

b) What is Schmid’s law? Explain critical resolved shear stress. (4)

4 a) Explain Hall-Petch theory. And what is the importance. (4)

b) What is diffusion? Explain the Fick’s laws of diffusion and what are the factors

affecting diffusions.

(6)

PART B Answer any three full questions, each carries 10 marks.

5 a) What are solid solutions? Explain Hume- Rothery rules. ( 4)

b) Explain Gibb’s Phase rule. Draw the phase diagram of a pure substance and

explain the phase rule in the diagram.

( 6)

6 a) Explain Austempering and Martempering. (4)

b) What is hardennability? Explain the test conducted for finding hardenability (6)

7 Explain various strengthening mechanisms (10)

8 What is alloying? Explain the effects of minimum four alloying elements used

for steel with their specific functions.

(10)

PART C Answer any four full questions, each carries 10 marks.

9 a) What is Fatigue? Explain S-N curve (6 )

b) What is stress concentration? Explain the factors affecting stress concentration ( 4)

B R5938 Pages: 2

Page 2 of 2

10 a) Differentiate ductile and brittle fractures ( 6)

b) Define creep .What are the factors affecting creep? (4)

11 a) What is DBTT in steels (3)

b) Explain Griffith theory of brittle fracture (4)

c) What is super plasticity and its application (3)

12 What are composites? classify (10)

13 a) What are intermetallics? Mention their applications (3)

b) What are super alloys (3)

c) Write short notes on maraging steels (4)

14 a) Write short notes on biomaterials and nuclear materials (4)

b) Classify ceramics and write applications of ceramics (6)

****

B B5805 Pages: 1

Page 1 of 1

Reg No.:_______________ Name:__________________________

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

Course Code: ME309

Course Name: METALLURGY AND MATERIALS SCIENCE (AU)

Max. Marks: 100 Duration: 3 Hours PART A

Answer any three full questions, each carries 10 marks Marks 1 a) 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

planes and Miller indices for directions. (5)

b) Explain the deformation 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

neat sketch. (7)

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

(3)

PART B Answer any three full questions, each carries 10 marks

5 a) Sketch an Iron-Carbon diagram and indicating the important phases and reactions in detail.

(8)

b) What are the stages in the mechanism of crystallization? (2) 6 a) Draw the TTT curve and explain about its principle of construction. (8) b) Name the various surface heat treatment methods. (2) 7 a) Write a short note on cold working and hot working with a sketch. (8) b) 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 C Answer any four full questions, each carries 10 marks

9 What is the mechanism of fatigue? Draw the S-N curves for steel and explain how these curves are developed experimentally.

(10)

10 a) Differentiate between ductile and brittle fracture. (7) b) What is the protection that is given against fracture of materials? (3) 11 a) Name the different types of composites and explain any one of them with

suitable examples. (8)

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

long time high temperature creep test. State how the information is helpful to the designer.

(8)

b) What is meant by maraging steel? (2) 13 a) What is meant by creep? and explain the mechanism of creep deformation. (8) b) What are smart materials? (2) 14 a) What are the factors affectingfatiguestrength? (6) b) What is DBTT? (4)

****

B B7041

Page 1 of 1

Total Pages: 1

Reg No.:_______________ Name:__________________________

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY FIFTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017

Course Code: ME309

Course Name: METALLURGY AND MATERIALS SCIENCE (AU)

Max. Marks: 100 Duration: 3 Hours PART A

Answer any three full questions, each carries 10 marks. Marks

1 a) Copper has an atomic radius of 0.128nm,an FCC crystal structure, and an atomic weight of 63.5g/mol.Compute its theoretical density.

(4)

b) What is meant by Miller Indices? Sketch (1 2 1) plane and [2 1 0] direction in simple cubic structure.

(6)

2 a) List the different mechanisms of plastic deformation. Explain anyone in detail. (5) b) Explain Schmid’s Law and term critical resolved shear stress. (5) 3 a) What is Interstitialcy? (2) b) Explain Frank-Read Source. (6) c) Differentiate Jogs and Kinks. (2) 4 a) Describe the step by step procedure for metallographic specimen preparation. (6) b) State and explain Fick’s second law of diffusion. (4)

PART B Answer any three full questions, each carries 10 marks.

5 a) Explain Hume-Rothery’s rules for substitutional solid solutions. (6) b) State Gibb’s phase Rule. What are its applications? (4) 6 a) Draw and explain Iron-Iron carbide phase diagram. (8) b) Why martensite is hardest and strongest micro constituent in iron carbon alloy

system. Explain. (2)

7 a) List out different strengthening mechanisms. Explain strain hardening in detail. (5) b) Discuss recovery, recrystallization & grain growth. (5) 8 a) Discuss the effects of alloying elements on the microstructure and properties of

steel. (8)

b) What is Gun-metal? Explain its properties and applications. (2) PART C

Answer any four full questions, each carries 10 marks. 9 a) Explain Griffith’s theory of Brittle Fracture. (6) b) Explain how a good design can resist fatigue failure. (4) 10 a) What is Transgranular Fracture and Inter granular Fracture? (4) b) Explain Ductile-Brittle Transition in steel. (6) 11 a) Explain the mechanism of Fatigue Failure. What are the factors affecting it? (7) b) Explain the role of thermal fatigue in metal cutting processes. (3) 12 a) What is an S-N curve? (2) b) What is creep? Explain its different stages? Give some examples of creep resistant

materials. (8)

13 a) What are composites? Explain any two different types with their specific applications in engineering.

(6)

b) What is meant by Maraging steels? (2) c) List out features of super alloys. (2) 14 a) What is ceramic? What are the different applications of ceramic materials. (5) b) Write short note on Nano-materials and Optical Fibres. (5)

****