Weird Weird Science posted this extreme zooming video on the structure of steel - quite awesome. They have video for concrete, brass, aluminium and more available as well. - Weird Weird Science on Dailymotion
Should you prefer a little more color & motion, check out Trey's macro video of a plasma ball in action -
Posted by Collin Cunningham |
Aug 29, 2008 06:00 AM
Science |
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The "cavity" they travel into in the video is NOT a defect or erosion, it's there because this is a powder casted part.
Powder casting is the most common way to make gears these days. Voids like this are a normal feature of powder casting because you fill the mold with powder, compress and heat it which causes *partial* melting and fusing, and you're done. It's very cheap and the finish looks no different superficially than a machined gear (the other method). The technique is also common for casting ceramics.
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This video about steel is so full of inaccuracies that I don't even know when to start correcting! If they can get metallurgists to provide those images, they should get proper explanations and terminologies. Carbon to protect from corrosion? Dendrites on a fractograph? Sheesh.
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The one that made my teeth hurt was their explanation of tempering.
That was so "I saw this video where a guy took a samurai sword and cut through a piece of train track" bad that I had to check something and, sure enough: In "The Making, Shaping and Treating of Steel, 10th Edition" they claim to be showing the microstructure of pearlite at 1000x, not 10,000-50,000x. I don't know what we were looking at in that video, but I'm gonna bet on the Association of Iron and Steel Engineers on this one.
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Forgive my ignorance, but can one really zoom into the atomic level with a microscope?
With all the other errors in this video, I was wondering if this was a gross misstatement by the narrator...
Comments rule. Thanks!
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@Volkemon - I was assuming the video was actually composited from multiple shots - and yes, these comments do rule. Thanks for the insight, everybody!
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