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10/ and, TLDR, this is why one hardens steel by plunging it into water, or oil, or whatever. HOWEVER once you do this the steel is too hard and can shatter if dropped, so you want to warm it up a bit (to "straw yellow", usually) and let a bit of annealing happen, >>>
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11/ The eutectic chart I posed before is just the simple Fe / C chart, but this - as advanced and scary as it is - is just baby stuff compared to the full set of alloys that are out there. So, anyway, just as chemistry evolved out of alchemy, so did material science >>>
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12/ evolve out of metalworking ; blacksmiths discovered a lot of this stuff accidentally (like learning that the magnetic properties of iron change right around the same temperature as the carbon migrates from face-centric to cube-centric, and this knowledge helped later >>>
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13/ scientists understand a lot of things. SO ANYWAY the original reference I was making was to a fantasy world where maybe alchemical-blacksmithing is well understood, to the point that eutectic charts exist... BUT ... there are "hidden islands of stability" or something
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14/ and, as per Tolkien's Gandalf and Elrond looking at the map of the misty mountains, there are details on the eutectic chart that can only be perceived in certain conditions ...
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15/ "quenching" is the sudden cooling I mentioned in paragraph 1 when I said "annealing" in paragraph 2 I meant exactly that one partial anneals AFTER quenchinghttps://twitter.com/Bobthewelding1/status/1262745171004817413 …
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16/ GOSH, I WISH! In fact, I know next to nothing about metallurgy, and I barely know the difference between 4130 and O-1. I'd LOVE to go deep on the topic.https://twitter.com/moritheil/status/1262749980520968192 …
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