From “The Efficient Engineer”. ( YouTube / Nebula )

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This video explores the superpower of steels – heat treatment, the precise heating and cooling of steel that allows the microstructure and so the properties of the material to be finely adjusted. It’s one of the main reasons steel is so dominant in engineering.
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For further reading I highly recommend Chapters 10 and 11 of "Materials Science and Engineering – An Introduction" (4th Edition) by Callister, which were of great use in preparing this video.