Self organising steel balls explain metal heat treatment

Get 2 months of Skillshare Premium for free at: https://skl.sh/stevemould4

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:    • 3000 ball bearings show crystal defects wi...  

Other metal heat treatment videos here:
   • Heat Treatment -The Science of Forging (fe...  
   • Видео  

You can buy my books here:
https://stevemould.com/books

You can support me on Patreon here:
  / stevemould  

just like these amazing people:

Glenn Watson
Joël van der Loo
Matthew Cocke
Mark Brouwer
Deneb

Image credits:

First microscope grain image (1:11):
Tugsataydin
https://commons.wikimedia.org/wiki/Fi...

Second microscope grain image (1:19):
Edward Pleshakov
https://commons.wikimedia.org/wiki/Fi...

Dislocation diagrams (4:14, 4:18):
Cdang
https://commons.wikimedia.org/wiki/Fi...

Twitter:   / moulds  
Instagram:   / stevemouldscience  
Facebook:   / stevemouldscience  
Buy nerdy maths things: http://mathsgear.co.uk