JNTU II B.Tech I Semester Regular Examinations, November 2008

JNTU II B.Tech I Semester Regular Examinations, November 2008

PHYSICAL METALLURGY

(Metallurgy & Material Technology)

SET-4

 

1. Write short notes on:

(a) optical Metallurgical microscope

(b) Preparation of specimen for electron microscopy.

 

2. The lattice parameter of iron (BCC) is 2.87A0. Find the number of atoms /cm2 on

planes (100), (110) and (111).

 

3. (a) What are the three most common intermediate alloy phases? Explain briefly.

(b) Define solid solution? Explain the kinetics of a solid solution?

 

4. Draw a typical equilibrium diagram for two metals completely soluble in solid and

liquid states. Explain the cooling of any one alloy from the above system.

 

5. Discuss the following:

(a) Origin of coring and Homogenization

(b) Properties of solid-solution alloys.

 

6. What is Duralumin? Discuss the following for this alloy.

(a) Chemical composition

(b) Heat treatment procedure

(c) Mechanical properties

(d) Applications.

 

7. Compare and contrast the following:

(a) Age hardening and Tempering

(b) Lower Bainite and Tempered Martensite (tempered at 1000 C).

 

8. Write a short note on the following:

(a) Austempering

(b) Patenting.