NOC:Heat Treatment and Surface Hardening - II


Lecture 1 - Recap - I


Lecture 2 - Recap - II


Lecture 3 - Recap - III


Lecture 4 - Determination of Phase Diagram (Experimentally) - I


Lecture 5 - Determination of Phase Diagram (Experimentally) - II


Lecture 6 - Determination of Phase Diagram (Thermodynamically)


Lecture 7 - Effect of pressure on phase transformation temperature and concept of equilibrium between condensed and vapor phase


Lecture 8 - Effect of different parameters on heat treatment and concept of saturation vapor pressure with examples


Lecture 9 - Title: Formation of ideal solid or liquid solution and (G-X) diagrams for ideal solutions (Part-I)


Lecture 10 - G-X diagrams (Part- II) and concept of chemical potential (Micro Sign) from G-X diagrams.


Lecture 11 - Concept of common tangent for equilibrium between two phases


Lecture 12 - Expressions for equilibrium of two phases - I


Lecture 13 - Expressions for equilibrium of two phases - II


Lecture 14 - Expressions for equilibrium of two phases - III


Lecture 15 - Determining nucleation of phases using G-X plot


Lecture 16 - ΔG for nucleation and overall transformation, concepts of solid state transformation including precipitation and Quasi-Chemical Model (QCM)


Lecture 17 - Introduction to real solutions and expression of ΔHmix based on the Quasi-Chemical Model (QCM)


Lecture 18 - Expression for ΔHmix as a function of interaction energy and mole fraction, based on the QCM - Part I


Lecture 19 - Expression for ΔHmix as a function of interaction energy and mole fraction, based on the QCM - Part II


Lecture 20 - Graphical representation of ΔGmix, ΔHmix, and -TΔSmix for real solutions and evolution of eutectic phase diagram from the G-X plots


Lecture 21 - Effect of ΔHmix on determination of phase diagrams (same crystal structure)


Lecture 22 - Effect of ΔHmix on determination of phase diagrams (Continued...)


Lecture 23 - Importance of phase diagrams


Lecture 24 - Effect of heat treatment on microstructure evolution in steel - I


Lecture 25 - Effect of heat treatment on microstructure evolution in steel - II


Lecture 26 - Recap of homogeneous and heterogeneous nucleation for solid to solid transformation


Lecture 27 - Nucleation rate and its dependence on T (temp. of interest), ΔT, ΔG v and ΔG* and, introduction to growth kinetics


Lecture 28 - Growth kinetics (Continued...)


Lecture 29 - Growth rate variation with undercooling and kinetics of overall phase transformation


Lecture 30 - Implication of Avrami’s equation with example on excel spreadsheet


Lecture 31 - Experimental verification of Avrami Equation


Lecture 32 - Linear regression (least squares) method to find the value of n and k in Avrami equation


Lecture 33 - In this lecture, method to determine the goodness of fit has been explained. Procedure to estimate the values of n and k from experimental data have also been discussed.


Lecture 34 - Stereology and quantitative metallography - I


Lecture 35 - Stereology and quantitative metallography - II


Lecture 36 - Grain size measurements methods


Lecture 37 - Statistical tools for analysis and reporting of obtained data with examples


Lecture 38 - Evolution of TTT and CCT diagram from f vs. t plots


Lecture 39 - TTT, CCT continue and hardenability of steel


Lecture 40 - Importance of heat treatment practices in real life (with examples)