This video shows the preparation of an ingot and a piston: sawing, grinding, and etching. Individual grains are visible. Several steel specimens are prepared: Flame hardened tooth of a gear wheel, induction hardened cylindrical shaft, induction hardened splined shaft, case hardened tooth of a gear wheel, weld joint. Weld pass structure and heat treated zones […]
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A new way of switching the magnetic properties of a material using just a small applied voltage, developed by researchers at MIT could signal the beginning of a new family of materials with a variety of switchable properties.





