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Call for Charpy toughness samples

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Larrin, Jan 26, 2018.

  1. mete

    mete Gold Member Gold Member

    Jun 10, 2003
    Cold Steel used to make a very fine hunting knife of A8 [not mod ] Then knife in every respect was excellent . But after a while there were complaints about the steel . Seems that they changed to some poor Chinese steel but still called it A8 ! I'm keeping mine !
     
  2. hugofeynman

    hugofeynman

    174
    Jan 18, 2011
    Not AUS8, Mete? Not meant to be a smart ass!!!
     
  3. Natlek

    Natlek

    Jun 9, 2015
    There's a lot of waste 15N20 steel here and I have never find / fabricated product from this steel / with more then 44-48 HRC hardness . They must have reasons for that ?
     
  4. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    For the application it is intended that is the chosen hardness.
     
  5. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    There are plenty of journal articles out there where they heat treated in small furnaces. The main thing preventing publication in a journal would be the lack of micrographs.
     
  6. mete

    mete Gold Member Gold Member

    Jun 10, 2003
    Hugo, sorry but that's how tight the memory about a company's screw up is ! Such a fine knife and they ruined it ! Besides at my advanced age a million different steel grades does get confusing !!
     
    hugofeynman likes this.
  7. hugofeynman

    hugofeynman

    174
    Jan 18, 2011
    No problem, Mete!

    Hopefully I can get an A8mod sample so Larrin can test it. And Ultrafort (Maraging steel). I have a big chopper made of it (3/8” thick) but don’t have much time for tests. Just did some chopping in a 2” dead and super dry olive branch that was really hard and the edge was intact. The damn branch was so dry that I needed more than 10 swings to cut it in half!

    I’m no knifemaker, so I depend on my makers/friends to make those small steel pieces.
     
  8. mete

    mete Gold Member Gold Member

    Jun 10, 2003
    Maraging steel , you don't here much about that theses days. That was my thesis progect back in the early days of maraging. They do make fencing swords of that now.
    Unfortunately in those days few had cameras so I have no photos of me making it .Induction furnace, forging hammer etc, the whole show ! :p
     
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  9. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013
    I’ve got the rest of the day set aside for heat treating today. :cool:

    I’ll see how far I get.


    Edit: six z-wear conditions in the oven as we speak.
    Warren
     
    Last edited: Feb 13, 2018
    rodriguez7 likes this.
  10. kuraki

    kuraki Where's my calipers? Knifemaker / Craftsman / Service Provider

    Jun 17, 2016
    I've got my kanthal and everything for repairing my furnace now so hopefully I can move along soon with samples.
     
    Willie71 likes this.
  11. Darrin Sanders

    Darrin Sanders Knifemaker Moderator Knifemaker / Craftsman / Service Provider

    May 6, 2009
    I haven't checked this thread lately but it seems to be gaining interest. Larrin, if you have any particular alloy, H/T protocol, or any combination thereof in mind, let me know and I'll make and H/T some coupons and get them to you. I'm a packrat so I have lots of coupon sized pieces of steel (all properly marked) laying on my steel shelf. If you want anything tested that I don't have, I'll get some from Chuck. Thanks to everyone who is participating.
     
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  12. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013
    Check the pic I posted last page to make sure we aren’t duplicating samples. Chuck was quite generous for this project.

    Warren
     
  13. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    3V, 4V, CPM-M4, Vanadis 4 Extra are all missing I believe. Another possibility is to pick one standard steel like AEB-L and to try more heat treatments like different types of prequenches, for example.
     
    valknut likes this.
  14. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013
    I’ve got 7 conditions in z-wear/cru-wear coming, and two conditions in 8670 and W2 coming. I should be able to send the x-wear by the end of the week, and maybe one or two others depending on how my real job plays out this week.
     
  15. rodriguez7

    rodriguez7 Gold Member Gold Member

    991
    Feb 1, 2009
    Was Nathan making up some pieces in 3v after all? I would imagine he could do 4v with his enhanced heat treat too! But I’m sure he’s a busy guy.
     
  16. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    He said he will see if he can contribute but has not committed to anything.
     
  17. kuraki

    kuraki Where's my calipers? Knifemaker / Craftsman / Service Provider

    Jun 17, 2016
    I have M4 and 4V on hand for this.
     
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  18. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    Oops! I see that in the thread now.
     
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  19. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    Here is an example of a set of heat treatments that could be performed with AEB-L:
    [​IMG]
     
  20. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013

    Is this something that can be advantageous in steels like z-wear or 4V? Is it worth experimenting with?
     

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