MOD1
Short Notes: ( 5 marks)
1. Discuss the differences and similarities between slip and twinning
2. Why FCC metals are in general more ductile than BCC and HCP metals?
3. Critical Resolved Shear Stress (C.R.S.S.)
4. Burgers vector.
Detailed Answer ( 10 marks)
1. What is dislocation? What are the sources of dislocation? Compare edge and screw dislocation.
2. Classify various types crystal defects? Discuss line defects and their types.
3. Classify various types crystal defects? Discuss line defects and their types.
MOD2
Short Notes: ( 5 marks)
1. What is recrystallization annealing? Discuss the various stages of recrystallization annealing.
2. Write the difference hot working and cold working
Detailed Answer ( 10 marks)
1. What is dislocation? What are the sources of dislocation? Compare edge and screw dislocation.
2. What is strain hardening? Explain the phenomenon on the basis of dislocation theory. Also
discuss role of Frank reed source in strain hardening.
3. Classify various types crystal defects? Discuss line defects and their types.
4. What is recrystallization annealing? Discuss the various stages of recrystallization annealing with
neat sketch.
MOD 3
Short Notes: ( 5 marks)
1. What are limitations of Plain carbon steel? Explain the alloying effect on phase transformations
2. Explain Hume- Rothery’s rules of solid solubility.
3. Draw and explain Isomorphous phase diagram.
4. Draw & explain cooling curve for solidification of:
a. Pure Metal
b. Binary alloy( Isomorphous)
c. Binary alloy( eutectic)
Detailed Answer ( 10 marks)
1. Describe the cooling of the 0.4%C steel from liquid state to room temperature. Calculate the
phases in this steel obtained at room temperature
2. Draw & explain with example phase diagram with invariant reaction & phases for following:
a. Eutectic
b. Peritectic
c. Eutectoid
d. Peritectoid
MOD 4
Short Notes: ( 5 marks)
1. Allotropic forms of iron
2. Short note on:
a. Cast iron
b. Low Carbon steel
c. Medium C steel
d. High C Steel
3. What are limitations of Plain carbon steel? Explain the alloying effect on phase transformations
Detailed Answer ( 10 marks)
1. Draw fully labeled neat sketch Fe-Fe3C equilibrium diagram. Also write invariant reactions in it.
2. Define Critical Cooling Rate. Describe various cooling curves on TTT diagram for eutectoid steel.
How such curves are drawn? What factors affect critical cooling rate.
3. Explain with figures the Phase transformation & microstructure changes in Hypo & Hyper
Eutectoid steel
4. Draw Fe-Fe3C diagram indicating all important temperatures, phases and compositions. Explain
slow cooling of an alloy containing 0.9% carbon when cooled from 16000 C temperature to room
temperature
5. Draw TTT curve for a eutectoid steel and explain the effects of various cooling curves on
transformation products
6. Explain Hardenability of steel? Explain Jomny End Quench test
7. Explain Graphitization in Cast Irons
MOD 5
Short Notes: ( 5 marks)
1. Tool steels
2. Write the classification of tool steels
3. Sub-zero treatment.
4. Explain Tempering and its different types.
5. Explain the transformation of austenite to Bainite.
6. Discuss the process of nitriding.
7. Discuss the process of Carburizing.
8. Discuss the process of cyaniding
9. Explain the effect of retained austenite on steels.
10. What are stainless steels? Give brief of classification of stainless steels
Detailed Answer ( 10 marks)
1. What is the need of heat treatment process? Differentiate between annealing and normalizing
process.
2. Explain induction hardening process with neat sketch. Also discuss its advantages, disadvantages
and applications.
3. Explain flame hardening process with neat sketch. Also discuss its advantages, disadvantages and
applications.
4. How is surface hardening different from case hardening? Discuss any one of the case hardening
methods in detail.
5. Differentiate between Austempering & martempering.
6. Explain following types of steels in detail *(10 mks note on each type)
a. Stainless steel
b. Tool Steel
c. Maraging Steel
d. Ausformed steel
MOD6
Short Notes: ( 5 marks)
1. Fracture toughness
2. Creep curve
3. Explain Creep resistant materials.
4. Explain thermal fatigue of metal.
5. Write the difference between ductile fracture and brittle fracture.
6. Discuss ductile-brittle transition in steel
7. Define creep and explain stages of creep.
Detailed Answer ( 10 marks)
1. Derive an expression for Griffith’s theory of brittle materials failure
2. What are the characteristic of brittle fracture? Discuss Griffith’s theory and derive its equation.
3. What is mean by endurance limit? Draw and discuss S-N curve for ferrous and non ferrous
materials.
4. Define fatigue failure. Discuss fatigue testing. Explain interpretation of S-N curve for ferrous and
non –ferrous metals.
