Breaking paradigms in steel technology @bhadeshia123

bhadeshia123 | Breaking paradigms in steel technology @bhadeshia123 | Uploaded June 2021 | Updated October 2024, 7 hours ago.
This talk challenges common notions regarding steel, its associated technologies and its uses. Organised by Professor Rampada Mann of the Indian Institute of Technology BHU. Has the weight of cars increased or decreased? Have developments in other materials affected the success of steel? There is additive manufacturing on a grand scale, the starship made from steel, lithium-ion batteries and much more .......
phase-trans.msm.cam.ac.uk

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$Atomic mechanism of acicular ferrite transformation in steels Non-metallic inclusions are anathema when it comes to the design of strong steels because they become the initiation sites for fracture. Huge efforts have been made devoted to making clean steels - the oxygen concentration of a hard bearing steel is routinely less than 10 ppm. However, there are other structural steels that have to be welded where the localised heat input generates microstructures in the heat-affected zone that are undesirable. The alloys that are used to deposit the weld must have good properties in the as-cast state. In both of these circumstances, specific non-metallic inclusions are a positive boon in that they provide substrates for the intragranular nucleation of bainite. As a consequence, highly organised sheaves of bainite are altered into a more chaotic arrangement that frequently deflects propagating cracks and hence enhances the toughness. This is the so-called acicular ferrite that is the subject of this lecture.$

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