3ME2: MATERIAL SCIENCE AND ENGINEERING

Ex Hrs:3

Unit-1

Atomic structure of Metals: Crystal structure, crystal lattice of (i) Boday centred cubic (ii) Face centred cubic (iii) Closed packed hexagonal, crystallographic Notation of atomic planes and Directions (Miller Indices), polymorphism and allotropy, Crystal imperfection.

Theories of Plastic deformation. Phenomenon of slip, twining and dislocation. Identification of crystallographic possible slip planes and direction in FCC, BCC, HCP. Recovery and recrystallization, prferred orientation causes and effects on the property of metals.

Classification of engineering materials. Solidification of metals and of some typical alloys: Mechanism of crystallisation (i) nuclear formation (ii) crystal growth. General principles of phase transformation in alloys, phase rule and euilibrium diagrams, Equilibrium diagram of binary system having complete mutual solubility in liquid state and limited solubility in solid state, Binary isomorphous alloy system, Hume-Rothery rule, Binary system with limited solid solubility of terminal phase and in which solubility decreases with temperature and also alloy with a peritectic transformation. Equilibrium diagram of a system whose components are subject to allotropic change. Iron carbon Equilibrium diagram, phase transformation in the iron carbon diagram (i) Formation of Austenite (ii) Transformation of Austenite into pearlite (iii) Martensite transformation in steel, TTT curves.

Engineering properties and their measurements. Principles and applications of annealing, normalizing, hardening, tempering. Recovery and recrystallization. Hardenability - its measures, variables, effecting. Hardenability, methods, for determination of Hardenability. Over-heated and Burnt steel, its causes and remedies. Temper brittleness - its causes and remedies. Basic principles involved in heat treatment of plain carbon steel, alloy steels, cast iron and Non-ferrous metals and their alloys. Chemical Heat treatment of steels: Physical principles involved in chemical heat treatment procedure for carburizing, Nitriding, Cyaniding, carbo-nitriding of steel.

Effects produced by Alloying element on the structures and properties of steel Distribution of alloying elements (Si, Mn, Ni, Cr, Mo, Co, W, Ti, Al) in steel, structural classes of steel, structural classes of steel. Classification of steels, BIS Standards. Fibre reinforced plastic composites: Various fibres and  matrix materials, basic composite manufacturing methods, applications of composite materials.