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Aiden CC

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Aiden CC last won the day on April 8

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About Aiden CC

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  1. Aiden CC

    Help Identifying Stump

    Makes sense. I have it boiling now, plan is to change the water a few times and them sticker it to air-dry. I'll probably leave the best pieces to air dry for a good long while and experiment with some smaller ones in the microwave. The log still has a few good burls on it I may go out and cut off later. I definitely agree that it isn't oak. It looks somewhat maple like, but I looked at some pictures of tulip bark/burl wood and agree it looks more like that. I think The density after it's a bit dryer will be a good way of confirming that. Not sure if I want to try stabilizing it at some point, the wood may be a little soft for handles otherwise.
  2. Aiden CC

    Help Identifying Stump

    I didn’t know about the boiling! Thanks for the tip. Do you seal the end-grain before the air drying? I’ll likely save the best pieces for a full air dry and some more plain ones to microwave on a few weeks. Some pictures of the wood. Does it look like it could be red oak? The bark looks good, but I think the wood is too light.
  3. Aiden CC

    Help Identifying Stump

    A recent project involved recycling waste materials and I ended up finding out from my college’s facilities director where they dump all the dead trees that fall on the road out in the woods by my school. On a trip out there a few days ago, I found the stump pictures below with a giant burn on it which I sawed off and later cut up. You can see where I cut the burl off. This was the only piece of the tree, so not much info to work with. Frankly, I don’t really know what type of wood it is and was wondering if anyone here has any idea. I’m located in eastern MA, if that helps. I can also get some more pictures of the cut up wood if that helps. Thanks for looking!
  4. Aiden CC

    Swiss Army Knife WIP

    All goes together! Needs some small refinements to fit, then on to finishing! Also, the blades are still at 62.5, so they get one more cycle.
  5. Aiden CC

    Swiss Army Knife WIP

    That’s a good point. I checked this morning and the blades were 62 ish and the springs 53. Put everything back in at a higher temp to try and get it all a bit softer. I’ll definitely run the tools again with an softer temper after I get the blades to the aim hardness.
  6. Aiden CC

    Swiss Army Knife WIP

    Gained almost two points of hardness with cryo!
  7. Aiden CC

    Swiss Army Knife WIP

    Got everything hardened! I put everything in two packets since it’s all so small, and I wanted to save time and foil. I still love the color stainless knives are when they come out of the foil. Everything is nice and hard! Currently in liquid nitrogen for cryo, plan is to temper the blades back to 61 and springs to 45. Is that too hard for thin blades like this?
  8. Aiden CC

    Getting into Metallography

    I actually have an O1 blade that broke while I was working on it before heat treat (into three pieces, like spaghetti) I was planning on taking a look at. Depending on what it looks like, it could be a good piece for a sub-critical anneal.
  9. Aiden CC

    Getting into Metallography

    Yeah, the professor I talked to explained the difference between the eutectic temperature and the recrystalization temperature, and suggested that the the anvil acting as a heat sink, rather than the hammer blows, is what caused the formation of martensite and bainite. I may try deforming some cold steel to get a better look at work hardening, though I guess I could also heat it below the recrystalization temperature to make it softer without allowing the formation of new defect-free grains.
  10. Aiden CC

    Swiss Army Knife WIP

    It is a bit of overkill, but I figured I should use it since I have it. More stainless foil came yesterday, so when I find some spare time I'll harden the blades and springs then put it all together!
  11. Aiden CC

    Getting into Metallography

    The MatSci professor I asked thinks so too, my current guess is that this is a mixture of work and air hardening.
  12. Aiden CC

    Getting into Metallography

    I'm definitely enjoying it! Plus, I got some money for steel and a bit of credit for it. My college is focused on hands on learning, so for a small school it has a pretty well equipped machine shop and materials science lab. Also, of the matsci professors who has been here for a while specialized in shape-memory alloys before he shifted his research to education, so there is a pretty good casting setup, which I've used to make some ferules for a set of fillet knives.
  13. Aiden CC

    Getting into Metallography

    It's been a little while, but I have some more pictures! This time, I normalized the spring in a furnace and then did some hot work on it. For now, I just have pictures of the normalized sample and an "as forged" coupon. First, the "control" Definitely pearlite, looks slightly hyop-eutectoid, maybe around 0.65-0.75% carbon (I seriously need to get SEM trained). Now after being aggressively forged and dropped on the floor after the last heat. Not sure what the black streaks are, maybe carbides, or dislocations between grains. There are more of them by the surface (bottom) A little closer (I know, my polish needs to be flatter, I was lazy and didn't want to change the abrasives on the rotary/roll grinders, that probably didn't help). Beside the strange dark streaks, this looks a lot like martensite, which would definitely explain the difficult of working steel right out of the forge. I have some more samples, which have been normalized 1, 2 and 3 times in a forge as well as a third "standard" heat treat of three normalizations followed by a "by eye" quench in canola oil and tempering at 375 F in a toaster oven. An interesting comparison; this section was cut 90 degrees to the other, such that he primary direction of the drawing out was the vertical direction of this photo. Does anyone know what the dark streaks might be? It's interesting how similar work hardening looks to a quenched microstructure.
  14. Aiden CC

    Swiss Army Knife WIP

    Starting on the cryo on the test-blades! We’re out of stainless foil, but should have some Monday to heat treat the blades/springs so I can assemble and check the action!
  15. Aiden CC

    Swiss Army Knife WIP

    Plan is to start cryo tomorrow morning. The cold thing I have access to is liquid nitrogen, however, I don’t think just dunking the blades would be good practice (thermal stress and all), though I could be wrong. Current plan is to have a container with liquid nitrogen with the blades supported above the level, or in a nested container to have a gentler cooling rate. Then I’ll test the hardness and temper again, probably around 450 F, with an aim hardness of 60-61.
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