JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objective

This theory course will help the students get introduced to various metals

and alloys that are industrially applied, their crystal, microstructures and phase transformation that take place with temperature and compositional changes

Course Outcomes

at the end of the course, the student will be able to

• Appreciate the wide range of characteristics of metals due to crystal structure variation
• Understand the phase transformations taking place in Fe-C binary phase diagram
• Construct the T-T-T diagrams for particular steel
• Suggest the heat treatment process for a particular metallic system

UNIT - I

Crystal Structure: Crystallography: space lattice, unit cell, lattice parameter, coordination number, atomic radius, packing factor, density calculations. Miller’s indices. Relation between crystal structure and ductility. Solidification; homogenous and heterogeneous nucleation. Polymorphism

UNIT - II

Binary Phase Diagrams: Construction. Isomorphous and eutectic systems-Specific examples: Cu-Ni, Pb-Sn, Al-Cu. Structure evolution. Phase rule. Lever rule. Hume-Rothery rules. Importance of electron-to-atom ratio. Binary Phase Diagrams. Intermediate phases. Intermetallic compounds. Application of phase diagrams. Precipitation hardening, Dispersion strengthening, ordering and clustering tendencies of solution phases, ordered phase, miscibility gaps, spinodal boundaries and spinodal dicomposition

UNIT - III

Microstructures: Grains and grain boundaries. ASTM Grain Size. Grain size dependence of strength. Strain hardening, Recovery, Recrystallization, and grain growth. Solid solutions- substitutional and interstitial solid solutions.

UNIT - IV

Iron-Carbon Phase Diagram: Phase transformations. Microstructures and quantitative phase evaluation of the Fe-C Alloys. Effect of Alloying Elements on the phase diagram, Time Temperature Transformation Curves, CCT curves, Effect of alloying elements on TTT and CCT curves.

UNIT - V

Isothermal Transformation Diagrams: Construction and interpretation. Effect of alloying elements on kinetics of transformation. Peralitic, Bainitic and Martensitic transformations.

TEXT BOOKS:

• 1. Materials Science and Engineering, An introduction. WD Callister, Jr., Adapted by R. Balasubramaniam, John Wiley & Sons, NY, Indian edition, 2007
• 2. Introduction to Physical Metallurgy – SH Avner, TATA Mc GRAW HILL,1997

REFERENCES:

• 1. Essentials of Materials Science Engineering, Donald R. Askeland, Pradeep P. Phule, Cengage learning (INDIA).
• 2. Engineering Physical Metallurgy and Heat treatment – Y Lakhtin