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  1. Alright - so this whole thing started in the Metallurgy section of the forum where I test some highly exotic steel from a Jet Turbine Engine shaft... That thread can be found HERE. As for the continuation of this little project - keep an eye on this thread right here. Alright, so I've tested some steel - and it seemingly has some incredible properties. It hardens to above 60 HRC when quenched in oil - but it stays maleable and not brittle - even at that hardness level. I had to use serious repeated force to break one in half. Here are some closeup images of the turbine shaft steel itself: Now - I was lucky with welding the first billet shown below: However - when attempting to double that - things did not go as well: Half the billet had a really bad weld going down the middle - it simply would not take. So - I've split them in half to be used later. Even when twisting the "good" billet - a piece came off. You can see it to the very left in the image. Some of it WAS usable though - so I proceeded with the build: Alright - so I put some high carbon steel in the middle as a san-mai lamination between what is now about 70 layers of folded turbine shaft steel, some steel from a couple of fixture pieces for holding turbine exhaust cases in place while machining as well as som 15/20 steel. The san-mai steel is Øberg-steel which hardens to a maximum of 63 HRC. Stay tuned for more progress updates.
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