MT452

High Temperature Materials

 

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Factors influencing functional life of components at elevated temperature, definition of creep curve, various stages of creep, metallurgical factors influencing various stages, effect of stress, temperature and strain rate

 

Design of transient creep, time hardening, strain hardening, expressions for rupture life for creep, ductile and brittle materials, Monkman - Grant relationship

 

Various types of fracture, brittle to ductile from low temperature to high temperature, cleavage fracture, ductile fracture due to micro void coalescence - diffusion controlled void growth; fracture maps for different  alloys and oxides

 

Oxidation, Pilling-Bedworth ratio, kinetic laws of oxidation - defect structure and  control of oxidation by alloys additions, hot gas corrosion deposit, modified hot gas corrosion, fluxing mechanisms, effect of alloying elements on hot corrosion

 

Iron base, nickel base and cobalt base superalloys, composition control, solid solution strengthening, precipitation hardening by gamma prime, grain boundary strengthening, TCP phase - embrittlement,  solidification of single crystals

TEXT BOOKS

1.       Raj R., ‘Flow and Fracture and Elevated Temperatures’, American  Society for Metals, 1985

2.       Hertzberg R. W., ‘Deformation and Fracture Mechanics of Engineering Materials’, 4th Edition, John Wiley, 1996

 

REFERENCES

 

1.             Courtney T.H, ‘Mechanical Behaviour of Materials’, McGraw Hill, 1990