Self organising steel balls explain metal heat treatment

Self organising steel balls explain metal heat treatment
Steve Mould

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Metals have a crystal structure. But they're not one big crystal, they're lots of small crystals called grains. The size of the grains affects the physical properties of the metal, like hardness, toughness, strength, mailability, ductility, plasticity. Heating a metal can change the size of the grains. This ball bearing model demonstrates annealing.

Ductility is dependent on how far dislocations are able to travel in the metal which is dictated by grain size.

Original ball bearings video here:

Other metal heat treatment videos here:

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Image credits:

First microscope grain image (1:11):

Second microscope grain image (1:19):
Edward Pleshakov

Dislocation diagrams (4:14, 4:18):

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의지는 찰라를 지나고 의념은 영원을 관통한다 [하늘-길 3]