A series of four lectures delivered under the auspices of the Graduate Institute of Ferrous Technology, POSTECH, Korea, on the nature of bainite in steels. The lectures were delivered at POSCO (Pohang, Korea), June 2007.
In addition to these streaming videos, you can also download high resolution videos (500 Mb each), slides and lecture notes.
| Title | Description | Available formats |
|---|---|---|
| Microstructure of Bainite | Here we explore the known features of bainite in steels, which in subsequent lectures are explained in terms of the atomic mechanism by which bainite forms. The bainite reaction on a time--temperature transformation diagram, in the context of all the other transformations that occur in steels; the microstructure of upper and lower bainite; the carbides that form during the bainite reaction; the sub--unit of bainite; the behaviour of substitutional solutes such as Mn, Si, Cr during the bainite reaction; the behaviour of interstitial solutes such as carbon or nitrogen during the bainite reaction; the shape deformation due to bainite; plastic relaxation. | flv (medium quality stream) mov (medium quality stream) mov(small quality dl) rm (high quality stream) swf (medium quality embed) wmv(medium quality dl) wmv (medium quality stream) |
| Atomic Mechanism of the Bainite Transformation | In order to design steels, it is not enough to simply look at the microstructure, but to be able to calculate it. In this lecture I will explain the way in which the atoms move during the bainite transformation and present some elementary thermodynamic and kinetic theory for the nucleation and growth of bainite. The difference between allotriomorphic ferrite, Widmanst\"atten ferrite, upper and lower bainite, acicular ferrite and martensite will be explained in a quantitative framework. | flv (medium quality stream) mov (medium quality stream) mov(small quality dl) rm (high quality stream) swf (medium quality embed) wmv(medium quality dl) wmv (medium quality stream) |
| Mechanical Properties of Bainite in Steels | Observing microstructure is not enough. The Engineer only sees properties such as strength, toughness, ductility. I will demonstrate here how it is possible to relate thermodynamics to toughness, the characteristics which determine strength, discontinuous yielding, fatigue, hydrogen absorption and diffusion and other complex properties. The concepts will be presented in such a way that the path towards the design of better steels is clear. | flv (medium quality stream) mov (medium quality stream) mov(small quality dl) rm (high quality stream) swf (medium quality embed) wmv(medium quality dl) wmv (medium quality stream) |
| Superbainite | This is the story about the world's first bulk nanostructured metal. All the knowledge from the first three lectures will be exploited to see how something that can be created which has a structural scale finer than carbon nanotubes, is stronger than those tubes, is cheap, easy to process and can be large in all three dimensions. | flv (medium quality stream) mov (medium quality stream) mov(small quality dl) rm (high quality stream) swf (medium quality embed) wmv(medium quality dl) wmv (medium quality stream) |
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