Syllabus

Module 1) Introduction- Problem with materials at high temperature, Background: Time-dependent deformation Difference between ambient and elevated temperature plastic deformation. 06 Hrs

Module 2) Theories of Creep: Definition of creep Different methods of creep testing Creep curve Effect of stress and temperature on creep curve Effect of microstructure on creep Stress-rupture tests Difference between creep and stress-rupture test Superplasticity. 10 hrs

Module 3) Mechanism of creep deformation - Lattice mechanism - Dislocation glide, dislocation climb, Boundary mechanism-Nabarro-Herring, Coble, Grain boundary sliding Determination of stress exponent and activation energy for steady-state creep Creep fracture micro-mechanisms Creep behavior of nanocrystalline materials. 08 Hrs

Module 4) Deformation mechanism maps Presentation of engineering creep data-Monkman -Grant relationship, Larson-Millar parameter. 04 Hrs

Module 5) Strengthening mechanisms of high-temperature materials, 4 Hrs

Module 6) Basis for development of creep-resistant materials Materials for elevated temperature application - Ni-base superalloys and their applications, High-temperature materials, intermetallics, and their application. 10 Hrs

To gain understanding of high temperature materials generally exploited at operating temperatures greater than the half of melting temperature.

To be acquainted with the creep phenomenon and associated mechanisms that primarily decide the thermal capability of the high-temperature materials.

To understand the methods of presentation of creep data and ways of predicting long-time creep properties by performing short-time tests.

To have familiarity with commercially available high temperature materials, their characteristics and applications.

The course outcomes (COs) are as follows:

CO1: Students will gain an understanding of high-temperature materials generally used at operating temperatures greater than half of the melting temperature.

CO2: Students will understand the characteristics and theory of high-temperature materials responsible for sustaining them in severe operating environments and providing resistance to mechanical degradation over extended periods.

CO3:
Students will get an idea about high-temperature tensile, creep, and stress rupture tests and associated mechanisms.

CO4:
Students will be acquainted with the creep phenomenon, stages of creep, mechanisms of creep, deformation mechanism maps, and associated changes in metallurgical structure.

CO5:
Students will get knowledge about how to predict the creep without performing a long creep test, the concept of Serby Dorn and Larson - Miller Parameters.

CO6:
Students will be familiar with the commercially available high-temperature, materials, their special characteristics, and their applications.

G. E. Dieter, Mechanical Metallurgy, McGraw-Hill , Third Edition, 1988

R. W. Hertzberg, Deformation and Fracture Mechanics of Engineering Materials, John Wiley , Fifth Edition, 1989

Michael E. Kassner, Fundamentals of Creep in Metals and Alloys,, Butterworth-Heinemann , 3rd Edition, 2015

Jean-Paul Poirier, Creep of Crystals-High-Temperature Deformation Processes in Metals, Ceramics and Minerals, Cambridge University Press , 1985