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Chapter8 PRS - Introduction to Chapter 8 In Chapter 7 we...

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Introduction to Chapter 8 In Chapter 7 we introduced the concepts associated with phase diagrams. Phase diagrams are important, but because of the importance of – Time at temperature – Interfacial energies – Microstructure scale – Morphologies of the microstructural elements – Stress state phase diagrams are only guidelines when considering processing and stability of an engineering product.
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Introduction to Chapter 8 Kinetics incorporates the influence of time and temperature on microstructure and thus properties. Because the major emphasis of the work of a materials’ engineer is to improve properties by manipulating microstructure an understanding of the fundamentals of kinetics is necessary.
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Chapter 8 Kinetics of Microstructural Transformations Structural transformations Driving force Homogeneous nucleation Heterogeneous nucleation Matrix/Precipitate Interfaces • Coherent • Semi-coherent • Incoherent Growth of a Phase
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Chapter 8 Applications to Engineering Materials • Phase transformations in steels – Decomposition of austenite to pearlite, bainite and/or martensite – Isothermal and athermal transformations – T-T-T curves- isothermal (IT) and continuous cooling (CT) – Hardenability and the the Jominy end- quench tests
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