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Jerrod Miller

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Everything posted by Jerrod Miller

  1. Jerrod Miller

    Super quench. Some data.

    That's a good idea. I'm planning on cutting some pieces of the same mild steel, and quenching in different mediums, etc, and testing them. I'll try to make sure I test hardness at varying depths also. In blade thicknesses you'll need to test with either Vicker's or Knoop. Rockwell is too big of a test; you'll be testing surface and a bit below surface. You may see a difference, but you certainly wouldn't be getting the whole story. This definitely would not refine grain growth in a measurable way.
  2. Jerrod Miller

    Super quench. Some data.

    This is important context that is often not in people's minds. Personally, I wouldn't worry about tempering. Though Stephen mentioned he is going to forge weld on some 1084, so in that case tempering is important. Also something very important in things that don't harden much is going to be mass and depth of hardening. For industrial information, look up info on the Jominy End Quench. Lastly, thanks for sharing Stephen! Obviously this is of interest to people.
  3. Jerrod Miller

    Culver Inspired (Copied) Slipjoint

    This did not go un-noticed. I'm judging you...harshly. This whole package is junk now. You'd better keep it for yourself, as it would be unfair to another smith to have this abomination forced upon them.
  4. Jerrod Miller

    My initial journey into crucible steels.

    You can't use one built into an eyepiece nearly as easily as one you look at as if it were a sample. If you want to give it a shot I can get you more info and/or PM me your number and we can discuss it over the phone, possibly while you're looking at it in the microscope or at a PC.
  5. Jerrod Miller

    My initial journey into crucible steels.

    Here is is a a jpeg.
  6. Jerrod Miller

    My initial journey into crucible steels.

    When I have looked at grain boundaries, it has been in easy things like this: square3.tif I generally wet grind up to 1200 grit, then polish on felt with 1 micron followed by whatever I have that is less than 1 micron, sometimes 0.50 or 0.25 micron, sometimes 0.05 micron. I then etch by rubbing the surface with a "lint free Q-Tip" dipped in etchant as long as it takes to go cloudy; typically about 30 seconds. Rinse with water, blow dryer until dry, check on microscope. Re-etch as necessary, typically in 5-10 second intervals (don't re-polish unless you've over-etched). If you can, definitely add scale bars to all your images. ImageJ is freeware that is quite powerful for these kinds of things. All you need otherwise is an appropriate sized scale bar to take a picture of, then make sure you don't change camera settings.
  7. Jerrod Miller

    My initial journey into crucible steels.

    My best results are typically with about 8-10%, when generally looking at steel microstructures for phase determination (pearlite, martensite, etc.).
  8. Jerrod Miller

    Bayonet

    The lug is on the rifle and goes in the hole you are showing. Alan is referring to a ring, typically integral to the guard, the fits around the muzzle of the gun. There doesn't appear to be one on your piece. (My apologies to Alan if he meant something else.)
  9. Jerrod Miller

    My initial journey into crucible steels.

    That is ... aggressive. I look forward to your results.
  10. Jerrod Miller

    My initial journey into crucible steels.

    Oh come on, you can't leave it at that! My default would be nital, what do you have here and in mind for future use?
  11. Jerrod Miller

    Thermocouple Q's

    Without going back and re-reading Alan's thread from 6 months ago, I'll just also add here that a thermocouple probe is just 2 dissimilar metals that create a voltage difference. So you could buy a K-type thermocouple and just use a voltmeter if you have one. You'll have to also make/find a chart that converts the voltage reading to degrees, but they are out there.
  12. Jerrod Miller

    How do i get a fiery beard?

    Same!
  13. Jerrod Miller

    Burning in a tang?

    This is one of those things that some makers will swear by, and others swear against. I will say that I have found it to be more difficult that I would have thought, but seems fine otherwise. I'd definitely plan on scraping (broach) the inside a bit after burning.
  14. Jerrod Miller

    More heat

    Since that appears to be a venturi forge, I'd say start by blocking the doors a bit less. Back pressure is no good for venturi.
  15. Jerrod Miller

    2x72 belt grinder to buy

    Keep in mind that it is direct drive with the 3 phase motor, so it will require a VFD, which doesn't seem to be included.
  16. Ran across this interesting table and graph, thought I would share. The source cited (4) is Siebert, Doane & Breen, The Hardenability of Steels, ASM, 1977. Moral to the story: Not only does an increase in carbon increase the ability of martensite to form, but it also corresponds to an increase in hardness for the martensite as well. I don't have the source material at hand, but I think it is safe to assume that "excessive" alloying elements besides Fe and C will also change the overall hardness. The paper I was reading that this chart appeared in did not go into any specifics in this case either.
  17. Jerrod Miller

    Effect of Carbon on Hardness in Martensite

    Assuming something like 1084, pretty much 100%.
  18. Jerrod Miller

    Effect of Carbon on Hardness in Martensite

    I can't say for sure, but my understanding would be that they are doing a microscopic (likely Vicker's) hardness on a localized patch of martensite, avoiding the ferrite/pearlite around it. The sample as produced would not be 100% martensite.
  19. Jerrod Miller

    Drilling Question

    If the answer to Alex's question in "after", don't do that. And don't harden that part of the tang anyway. Also, normalizing is better than annealing here.
  20. Jerrod Miller

    2205 Duplex stainless steel

    For those wondering (probably nobody), the "duplex" means austenite and ferrite, which pretty much tells you it isn't hardenable right in the name.
  21. Jerrod Miller

    The Knife making bible?

    What Adam said. Also, check out all the pinned threads, as they are pinned for a reason.
  22. Jerrod Miller

    Limonite and cuprite?

    Please refrain from saying such offensive things on this forum.
  23. Jerrod Miller

    2x72 belt grinder to buy

    VFD = Variable Frequency Drive, NEMA 4X is a certification for a sealed box for a VFD, TEFC = Totally Enclosed Fan Cooled which is a motor description/rating. Check out Wayne's site, link in his signature.
  24. Or there is Clay Art Center in Tacoma.
  25. You can also order from High Temp Tools.
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