Course Details
Subject {L-T-P / C} : MM4507 : High Temperature Materials { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Kumud Kant Mehta
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 behaviour 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, 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. 14 Hrs
Course Objectives
- To gain understanding of high temperature materials generally exploited at operating temperatures greater than the half of melting temperature.
- To understand the characteristics and theory of high temperature materials responsible for sustaining them in severe operating environments and provides resistance to mechanical degradation over extended periods of time.
- To be acquainted with the creep phenomenon and associated mechanisms that primarily decides the thermal capability of the high temperature materials.
- To have familiarity with commercially available high temperature materials, their characteristics and applications.
Course Outcomes
The course outcomes are as follows: <br /> <br />CO1: Students will gain understanding of high temperature materials generally used at operating temperatures greater than the half of the melting temperature. <br /> <br />CO2: Students will understand the characteristics and theory of high temperature materials responsible for sustaining them in severe operating environments and provides resistance to mechanical degradation over extended periods of time. <br /> <br />CO3: <br />Students will get idea about high temperature tensile, creep and stress rupture tests and associated mechanisms. <br /> <br />CO4: <br />Students will be acquainted with the creep phenomenon, stages of creep, mechanisms of creep, deformation mechanism maps and associated change in metallurgical structural. <br /> <br />CO5: <br />Students will get knowledge about how to predict the creep without performing long creep test, concept of Serby Dorn and Larson - Miller Parameters. <br /> <br />CO6: <br />Students will be familiar with the commercially available high temperature materials, their special characteristics and applications.
Essential Reading
- G. E. Dieter, Mechanical Metallurgy, McGraw-Hill , 3rd Edition, 1988
- R. W. Hertzberg, Deformation and Fracture Mechanics of Engineering Materials, John Wiley , 5th Edition, 1989
Supplementary Reading
- Michael E. Kassner, Fundamentals of Creep in Metals and Alloys, Butterworth-Heinemann , 2015
- Jean-Paul Poirier, Creep of Crystals-High-Temperature Deformation Processes in Metals, Ceramics and Minerals, Cambridge University Press , 3rd Edition,1985