My Profile
Active Members
TodayLast 7 Days
more...
Awards & Gifts
Online Exams
Fresher Jobs
Our fresher job section is exclusively for fresh graduates! Find jobs for freshers in major Indian
cities including Bangalore, Chennai, Hyderabad, Pune or Kochi
Resources
Find educational articles, blogs, discussion threads and other resources.
Colleges
Find details about any college in India or search for courses.
|
MY1253 PHASE TRANSFORMATIONS
Posted Date: 15 May 2008 Resource Type: Articles/Knowledge Sharing Category: Syllabus
|
Posted By: Nithya Krishna Member Level: Gold
Rating:  Points: 1
|
|
|
MY1253 PHASE TRANSFORMATIONS
1. DIFFUSION CONTROLLED PHASE TRANSFORMATION
Nucleation and growth - Types of nucleation - Concept of free energy during solidification - Thermodynamics of homogeneous nucleation - critical nucleus size and critical free energy change - Constitutional supercooling - Extension to heterogeneous nucleation - Nucleation rate and Growth rate - Overall Transformation rate. Concept of Activation energy - Arrhenius equation - Johnson Mehl - Avrami equation. Pearlitic transformations.
2. DIFFUSIONLESS TRANSFORMATIONS
Martensite transformation - Definition - characteristic features of Martensitic transformation in steels - Morphology of Martensite - lath and acicular Martensite - Crystallography of Martensitic transformation - Martensite in Non-Ferrous systems - Thermo Elastic Martensite - Shape Memory effect - Examples and applications of shape memory alloys.
3. STRENGTHENING MECHANISMS
Elementary discussion of cold working, grain size strengthening. Solid solution strengthening. martensitic strengthening, dispersion strengthening, fibre strengthening, examples of above strengthening mechanisms from ferrous and non- ferrous systems, simple problems. Yield point phenomenon, strain aging and dynamic strain aging
4. PRECIPITATION HARDENING
Precipitation from solid solutions, thermodynamic considerations, structure and property during ageing, sequence of ageing, formation of G-P zones and intermediate precipitates, theories of precipitation hardening, effect of time, temperature and alloy compositions, precipitation free zones, crystallographic aspects of transformation, coarsening kinetics.
5. ANNEALING
Cold working and hot working. Recovery - polygonization and dislocation movements in polygonization. Recrystallisation - effect of time, temperature, strain and other variables, mechanism of nucleation and growth. Grain growth – Grain growth law, geometrical collisions, preferred orientation, secondary recrystallisation. TEXT BOOKS
1. Raghavan.V., “Phase Transformations”, Prentice - Hall of India, New Delhi, 1990.
2. Dieter, G.E., “ Mechanical Metallurgy”, McGraw-Hill, New York, 1995.
REFERENCES
1. Reed Hill. R.E. “Physical Metallurgy Principles”, Affiliated East West Press. New Delhi. 1992.
2. Thomas H Courtney, “Mechanical Behaviour of Materials”, McGraw-Hill Co., NY. 1990.
3. Romesh C. Sharma, “Phase transformation in Materials”, CBS Publishers & Distributors, New Delhi, 2002.
|
Responses
|
| Author: Vidya 23 May 2008 | Member Level: Diamond Points : 2 | useful article
|
|
Watch TV Channels
Watch Asianet TV onlineKairali TV in InternetSurya TV onlineAmritha TV Channel
|