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Collimatrix last won the day on February 20

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About Collimatrix

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    The Atomic Prince of Punk

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  1. I've noticed a lot of ballistics FEA simulations popping up on Youtube lately. A result of the ever-dropping price of number-crunching power? Who knows. I cannot, of course, vouch for the accuracy of these simulations. They sure are pretty to look at though.
  2. Hello, and welcome to the forums. The standard J2M definitely had a mechanically driven supercharger; basically all WWII piston engines do. I believe that little accessory case strapped to the back of the engine has the supercharger in it somewhere: The heat dissipation finning on WWII radial engines is truly a magnificent form of art. AIUI, the engine cowling cooling fan reduces power at low airspeeds, since it's strapped to the engine crankshaft and is therefore taking some power to generate cooling airflow, but that this power loss basically goes away at high airspeeds as the r
  3. Part of my brain still refuses to accept that "solutionize" is an actual piece of metallurgical terminology and not something that George W. Bush came up with. He's not a problemifier, he's a solutionizer.
  4. Paul Hazell has a patent on ERA that uses a ceramic flyer plate which fragments shortly after interacting with the jet or penetrator, with the idea being that it reduces collateral damage. Other than that, I am not sure.
  5. That's a good question, and I'm not sure. Per the spec sheet N-L-M posted, it is a solution hardening (which is the same thing as "age hardening;" metallurgical terminology is nonsense sometimes) alloy. I bet that small titanium addition is what's doing the trick. So the precipitation hardened part could be reset. However, it also has a bit of carbon in it, unlike a lot of other maraging steels. If you tried to "reset" the heat treatment, that carbon could cause some problems. Some carbides form at higher temperatures than the intermetallic precipitates, and if the metal is ho
  6. I've seen some papers demonstrating that it can be done at a small scale, but I haven't seen anything saying yea or nay about large-scale, long-term durability. So I don't know for sure. Assuming that the weld itself is sound, one of the interesting properties about maraging steels is that the heat treatment can be "reset." The strengthening mechanism in maraging steels is the precipitation of tiny inclusions of intermetallic compounds (which is why maraging steels usually have weird shit in them like titanium; that's what helps form the intermetallic). By heating up the steel,
  7. @Monochromelody Do you happen to know?
  8. Indeed. One of the problems that occurs in steels with a lot of carbon and a lot of alloying elements is that instead of doing their respective jobs, the alloying elements and the carbon want to go off and play together and form carbides. This is a particular problem in high-carbon stainless steels, as the chromium and carbon very much want to form chromium carbide instead of staying in solution and providing corrosion resistance and interstitial hardening, respectively. There are ways to mitigate, but not entirely solve this problem.
  9. No, maraging steels require a pretty good amount of alloying elements, usually (a whole metric buttload of) nickel, cobalt and molybdenum, and then a dash of something strange like titanium or aluminum which forms the small, dispersed intermetallic inclusions that form during the final heat treatment.
  10. Yes. Generally speaking, bainitic steels are fairly cheap, at least in terms of the raw materials. I can't speak for how much the exotic heat-treatment processes needed to create them drive the cost. The martensitic transformation is a diffusionless transformation. In fact, not only is it diffusionless, but it works substantially better and easier the less diffusion there is. For this reason, fairly expensive alloying elements like molybdenum and chromium are added to (among other things) prevent the diffusion of carbon out of the austenite crystals during quenching. The bai
  11. Yes, typically light tanks or tank destroyers have special, longer recoil stroke variants of standard guns. For an older example, the TAM had a special variant of the L7 which could accommodate a 540mm recoil stroke vice the standard 280mm.
  12. Ah, so that does sound like flash processing, or something fairly similar to it. I am... not entirely clear on how flash processing works, chemically speaking. You can do some interesting things with it that do not make sense to me. The nanostructured bainite that has been of interest for armor applications lately has an extremely lengthy heat treatment process that requires that the steel be held at temperature for multiple days. But flash bainite processing can produce a comparably strong microstructure in mere seconds. Given how bainite actually forms, I don't und
  13. I'm not sure if strong conclusions can be taken from that one video. Different ammo types produce radically different amounts of recoil. Discarding sabot training ammo doesn't produce too much recoil, while HE-FRAG is firing a big, heavy shell with a lot more momentum. Aside from that, it occurs to me that the 120mm armed tanks listed are all heavier than the 125mm armed ones, although the weight of the K2 and T-14 overlap. How a tank responds to the recoil of its gun firing is a function of the total momentum of the shot, the mass of the vehicle, the moment of inerti
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