EMM (B-TECH Mechanical Engineering 3rd)

Unit –I

Crystallography: Atomic structure of metals, atomic bonding in solids, crystal structures, crystal

lattice of body centered cubic, face centered cubic, closed packed hexagonal; crystalline and non

crystalline materials; crystallographic notation of atomic planes; polymorphism and allotropy;

imperfection in solids: theoretical yield strength, point defects, line defects and dislocations,

interfacial defects, bulk or volume defects. Diffusion: diffusion mechanisms, steady-state and nonsteady-state

diffusion, factors affecting diffusion. Theories of plastic deformation, recovery,

re-crystallization.

Unit –II

Phase Transformation: General principles of phase transformation in alloys, phase rule and

equilibrium diagrams, Equilibrium diagrams of Binary systems. Iron carbon equilibrium diagram

and various phase transformations. Time temperature transformation curves (TTT curves):

fundamentals, construction and applications.

Unit –III

Heat Treatment: Principles and applications. Processes viz. annealing, normalizing, hardening,

tempering. Surface hardening of steels: Principles of induction and oxyacetylene flame hardening.

Procedure for carburising, nitriding and cyaniding. Harden-ability: determination of harden-ability. 

Punjab Technical University

Jominy end-quench test. Defects due to heat treatment and their remedies; effects produced by

alloying elements. Composition of alloy steels.

Unit –IV

Ferrous Metals and Their Alloys: Introduction, classification, composition of alloys, effect of

alloying elements (Si, Mn, Ni, Cr, Mo, W, Al) on the structures and properties of steel.