Physical Metallurgy — Winter 2022

Define crystal system by lattice parameters.

Illustrate the atomic arrangement of BCC, FCC, and HCP. How many atoms are in a unit cell of the same?

Find the atomic radii of BCC. Find the APF of BCC by using atomic radii.

Draw the miller indices of: (1 2 1), (1 1 1), (3 2 1).

If the metal Aand metal Bare completely soluble in liquid-state as well as solid-state. For the said condition, draw the phase diagram.

Draw the Fe-Fe Cdiagram and its invariant reactions. Label the phase3 diagram appropriately and show phases for 0.8 wt. % Cat various temperatures in the Fe-Fe Cdiagram.3

What are the phases present in 0.4 wt. %C? To reveal the phases under the microscope, what procedural steps are required?

What is the crystal structure of cementite and martensite?

Determine the ASTM grain size number if 25 grains per square inch are measured at a magnification of 75.

What do you mean by nucleation and growth? Explain the thermodynamic concept of homogeneous nucleation. Determine critical radius and free energy for homogeneous nucleation.

Determine the term: degree of freedom; phase; and thermodynamic equilibrium.

What informations collect from the phase diagram?

Explain the Gibbs’ phase rule.

Draw a cooling curve for pure metal.

Classify the cast iron. Explain any one cast iron by microstructure.

Explain the Hume-Rothery rules for a substitutional solid solution.

What is polymorphism? Draw the allotropy of iron.

Explain any one strengthening mechanism.

What is the purpose of heat treatment? Explain briefly annealing, normalizing, and hardening.

How hardenability of steel is to be carried out?

Classify the super alloys.1

Draw the ray diagram of metallurgical microscope for bright field illumination.

Describe any grain size measurement method.

How is the lever rule applied on the phase diagram for finding the amount of phase?

Describe the peritectic system by example.