Self organising steel balls explain metal heat treatment

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  • Published on:  Thursday, August 22, 2019
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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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  • Inductor87


     14 days ago

    How does this affect magnetism? Do steels with small grains or large gains show differences in their ability to magnetize when struck with a magnet?

    The grain size brings me back to my igneoua petrology class. As a magma cools, depending on what elements are present, specific minerals will form first using up certain elements. When that element gets used up a different mineral will form leaving a complex arrangement of different minerals known as a rock. Slower cooling results in larger minerals formed.

  • Roger Gibson

    Roger Gibson

     21 days ago

    What would the metal act like if you were to make it one perfect crystal? No imperfections and no separate grains?

  • David Kempton

    David Kempton

     21 days ago

    Hey, you told Mr Parker that there were 10,000 balls in there! :-)

  • yttrium


     21 days ago

    I misread the title as "self organizing steel balls explain mental health treatment" and I spent approximately a minute trying to figure out what the hell that even means.

  • Nace Le Cap Man

    Nace Le Cap Man

     28 days ago

    Is this a JoJo's reference!?

  • B .S

    B .S

     28 days ago

    Wish i could buy this 😪

  • ScoriacTears


     28 days ago

    2:36 Looks a little like an inverted game of life glider IRL.

  • MisterZ3r0


     1 months ago

    My internal heat rises when you jiggle my balls around, too.

  • Tod Stokes

    Tod Stokes

     1 months ago

    That was a fantastic visualization.

  • Krystal Poloka

    Krystal Poloka

     1 months ago

    Why use the term ductility and not malleability?

  • Douglas Villar Rodrigues

    Douglas Villar Rodrigues

     1 months ago +1

    That one grain:
    Aight 'imma head out.

  • Puppie Pill

    Puppie Pill

     1 months ago

    2:37 I like how empty space can't be filled in but only moved. Or weeeee... away

  • Nathan Haaren

    Nathan Haaren

     1 months ago

    dont mind me, just watching a grown man jiggle his balls around with a vibrator

  • Jonny8859


     1 months ago

    jiggle my balls too, please.

  • Staring at the Black Sun Trying to SEE THE LIGHT

    Staring at the Black Sun Trying to SEE THE LIGHT

     1 months ago

    Bigger thing is carbon content in iron, from 1-8% there are totally different temps and times.
    For aluminum, rolling it then heating it is important, then tempering it ...
    So many different things for many different metals.
    Copper ... eh ... just get it molten then cast shit from it ... just watch YouTube!

  • Yuen Kik Li

    Yuen Kik Li

     1 months ago

    This is How God create County borders.

  • Rodel Wade

    Rodel Wade

     1 months ago

    lmao Jiggling balls giddity

  • Hammy Technoid

    Hammy Technoid

     1 months ago

    I'm an audio guy from way back when cassettes first came on the scene, and I remember when some manufacturer, maybe AKAI, came up with "Glass Ferrite Heads" and how they were so called "impervious to wear"... You're explanation and demo really gives insight to the metallic structure of those type of heads. I still own machines with "Ferrite" heads, and after more than 30 years, they barely show any wear. Of course, they do wear, but to such a small degree compared to softer "Permalloy" heads, which are more common, and probably cheaper to produce.

  • NIKKO Films

    NIKKO Films

     1 months ago

    I do this when I shake a cup of chips to put more in.

  • andrew zgoda

    andrew zgoda

     1 months ago

    I wish they put this in my high school physics class. It would have been interesting to see a paperclip under heat vs no heat be bent or shown an easy DIY way to display proof of concept.