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HEAT TREATMENT
1. TRANSFORMATIONS IN STEELS
Iron - carbon equilibrium diagram: Transformations on heating and cooling, influence of alloying elements, general principles of heat treatment of steels, Isothermal and Continuous cooling transformations in steels. Continuous cooling curves TTT and CCT diagrams. Mechanism of Pearlitic, Bainitic and Martensitic transformations.
2. HEAT TREATMENT PROCESSES
Annealing, Normalizing, Hardening - retained austenite -measurement and methods of its elimination, Hardenability studies- Jominy end quench test, Grossman's experiments Tempering- Hollomon & Jaffe tempering correlations, Austempering and Martempering, Precipitation hardening, Thermo mechanical treatment, Intercritical heat treatment, other heat treatment processes- splat cooling.
3. CASE HARDENING
Introduction, Carburising: Principle, carbon potential, mechanism, application of Fick’s law, depth of carburization and its control, methods of carburising, heat treatment after carburising, structure, properties and common problems in carburising. Nitriding: introduction, steels used, mechanism, effect of microstructure, white layer, nitriding methods, ion nitriding and nitro-carburising. Induction and Flame hardening: principle, methods, operating variables. Measurement of case depth.
4. HEAT TREATMENT EQUIPMENTS
Various heating media used for heat treatment. Temperature and atmosphere control, carburising atmosphere and carbon potential measurement, nitriding gas atmospheres. Quenching media and their characteristics. Various heat treatment furnaces, fluidized bed furnaces, cryo chamber, cryo treatment of steels, sealed quenched furnace.
5. HEAT TREATMENT OF SPECIFIC ALLOYS
Heat treatment of carbon steels, various types of tool steels, high speed steels, maraging steels and die steels. Heat treatment of gray cast irons, white cast irons, malleabilising and S.G.irons, austempering of S.G.Iron. Heat treatment of aluminium alloys. copper alloys and nickel alloys. Defects in heat treated parts: causes and remedies.
TEXT BOOKS
1. Rajan.T.V., Sharma C.P., Ashok Sharma., “Heat Treatment Principles And Techniques” Prentice-Hall Of India Pvt. Ltd., New Delhi, 2002
2. Vijendra Singh, “Heat Treatment of Metals”, First edition, Standard Publishers Distributors New Delhi, 1998.
REFERENCES
1. American Society for Metals, “Metals Handbook Vol.4”, ASM Metals Parks. Ohio, USA, 1991
2. Prabhudev. K H. “Handbook of Heat Treatment of Steels”, Tata McGraw-Hill Publishing Co., New Delhi, 1988.
3. Novikov,.I., “Theory of Heat Treatment of Metals”, MIR Publishers, Moscow, 1978
4. Thelning K.E., “Steel and its heat treatment”, Bofors Handbook, 1975.
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